DEV Community: jamesliu

915MHz vs 2.4GHz: How to Choose the Right Frequency Band for Your Drone Receiver

jamesliu — Tue, 23 Jun 2026 07:43:28 +0000

Introduction

Choosing the right frequency band is the first critical decision when building a drone control link. 915MHz (Sub-GHz) and 2.4GHz have fundamentally different physical characteristics. There is no absolute "better" option — only what suits your flight scenario.
Penetration: The Key to Avoiding Signal Loss

915MHz: With a wavelength of approximately 32cm, it has strong diffraction capability, easily bypassing trees and building edges, maintaining link stability in complex terrain.
2.4GHz: With a wavelength of approximately 12.5cm, it has weak diffraction capability. The signal path is essentially "line-of-sight," and signal strength drops sharply when obstacles are present.

Anti-Interference Capability

915MHz: Fewer interference sources (mainly other LoRa devices). Combined with LoRa spread-spectrum technology, its anti-interference capability is extremely strong.
2.4GHz: The most congested ISM band, with dense interference from Wi-Fi, Bluetooth, and microwave ovens. Interference risk is higher in urban areas or event venues.

Range and Latency

915MHz: Lower path loss, combined with LoRa's ultra-high sensitivity, gives it an unshakable advantage in long-range communication (several to tens of kilometers). However, the air data rate is relatively lower, and latency is slightly higher.
2.4GHz: Higher path loss, relatively limited range (though high-end modules can still reach 8km). However, it supports high packet rates with extremely low latency, making it the best choice for FPV racing.

Regulatory Restrictions (Critical)

China: Drone remote control primarily uses 2.4GHz. Using 915MHz requires caution.
United States: 915MHz (FCC) is legally permitted and commonly used for long-range flights.
Europe: 868MHz is the primary band used.

Conclusion: How to Choose?

Long-range & complex terrain → 915MHz. For example, agricultural drones operating in mountainous areas.
FPV racing & low latency → 2.4GHz. For example, racing drones.
Ultimate solution: Dual-band redundancy. Use 2.4GHz as the primary control link and 915MHz as a long-range backup.

ExpressLRS Open-Source Protocol Explained

jamesliu — Tue, 23 Jun 2026 05:33:14 +0000

Introduction

In the world of FPV drones, the latency and range of the control link define the ceiling of the flight experience. Traditional commercial protocols either suffer from high latency, limited range, or require expensive proprietary hardware. ExpressLRS (ELRS) has completely changed this landscape. As an open-source, high-performance RC link protocol, it has rapidly become a favorite within the community.
Product Overview

ELRS is not a commercial product, but an open-source firmware that runs on general-purpose RF modules (such as Ebyte's E80 series dual-band LoRa modules). It works with specific MCUs, and once flashed with the firmware, can be used as either a transmitter (TX) or receiver (RX), communicating with the radio or flight controller via the CRSF protocol.
Features and Core Advantages

ELRS's core selling points are ultra-low latency and ultra-long range. On the 2.4GHz band with a 500Hz packet rate, end-to-end latency can be as low as 3-5ms, rivaling top-tier commercial protocols. On the Sub-GHz band (915MHz) with 1W of power, communication range can reach tens of kilometers.

Open-source and customizable: Users can freely adjust air rate (25Hz-500Hz), transmit power, and other parameters. The community is active and firmware iterates rapidly.
Low cost: Compatible with low-cost RF chips such as SX127x and SX128x, delivering top-tier performance at a fraction of the cost.

Application Scenarios

FPV Racing: 2.4GHz 500Hz mode provides millisecond-level response, ideal for freestyle and racing.
Long-Range Flight: Sub-GHz 50Hz mode with 1W power achieves stable control links over tens of kilometers.
DIY Makers: The open-source nature provides a platform for in-depth learning and secondary development.

FAQ: Which Ebyte Module Should I Choose for ELRS?

Long-range challenge: Choose the E80-900M2212S (900MHz version, LR2021 chip).
Low-latency pursuit: Choose an SX1280-based 2.4G module, or operate the E80 series in 2.4GHz mode.
Dual-band backup: Choose the E80-xxxM2213S (based on LR1121), which natively supports Sub-GHz and 2.4GHz dual-band switching.

ESP32-C3 vs ESP32-S3 — A WiFi Module Selection Guide to Avoid Pitfalls

jamesliu — Tue, 02 Jun 2026 06:13:29 +0000

Section: MCU / Wireless Modules

Our company recently started two projects simultaneously, using the EBYTE E101-C3MN4 series (ESP32-C3) and E101-S3WN8 series (ESP32-S3) respectively. The differences are significant — here's what I learned to help you avoid mistakes.

Core Differences:

ESP32-C3 (E101-C3MN4 series)

Architecture: Single-core RISC-V 32-bit, 160MHz
Positioning: Best value for money, WiFi + BLE 5.0, low cost
Use Cases: Smart plugs, lighting control, simple sensor gateways — IoT endpoints with low compute requirements
Limitations: No camera interface, no USB OTG, essentially limited to TCP/UDP/MQTT

ESP32-S3 (E101-S3WN8 series)

Architecture: Dual-core Xtensa LX7, 240MHz, with integrated neural network processor
Positioning: AI edge computing, supports vector instructions and SIMD acceleration
Use Cases: AIoT products with vision recognition, voice recognition, or LCD display
Advantages: 2.4G+5G dual-band WiFi, supports USB OTG and camera interface

My Experience:

If your project only needs data collection and WiFi connectivity → choose C3, save cost and power. AT commands work universally.

If your project needs AI algorithms, display, or video processing → you must go with S3, otherwise the compute power won't be enough.

Reminder: EBYTE modules all support AT commands, which is very friendly for engineers unfamiliar with WiFi development — you can drive them directly via serial port. But if you need deep customization, I recommend using Espressif's official ESP-IDF framework.

Wi-SUN Module with a German Chip — Real-World Test of the E51-470NW16S

jamesliu — Tue, 02 Jun 2026 06:12:20 +0000

Section: Smart Home / Smart City

I've been researching smart streetlight projects that require building ultra-large-scale wireless networks with thousands of nodes. Traditional LoRa is good, but the lack of unified protocol standards makes cross-vendor interoperability a persistent headache.

Then I came across the EBYTE E51-470NW16S, a Wi-SUN SoC module based on the Silicon Labs EFR32FG25 chip (German-designed) . It perfectly solved my pain points.

Why Choose Wi-SUN?

Open Standard Protocol: Wi-SUN is an international standard — devices from different manufacturers can interoperate, with no limits on future expansion.
Massive Scale: Based on IPv6, theoretically supporting thousands of nodes — ideal for smart city and smart grid applications.
Long Distance + High Speed: Uses OFDM modulation in the 470-510MHz band, with close-range data rates up to 3.6Mbps and open-area communication distances of 0.3~2.5km.

Real-World Impressions:

The EFR32FG25 chip runs at 97.5MHz with up to 1152KB Flash — very capable processing power.
The module exposes USB 2.0, EUART, SPI, PWM, ADC and other rich interfaces, making secondary development very flexible.
Supports Silicon Labs' official Simplicity Studio + Gecko SDK development environment, with excellent code quality and documentation.

Comparison with SPI-based Modules:

Traditional SI4463/CC1101 modules require you to write your own protocol stack — long development cycles.
The E51 series is essentially a "plug-and-play Wi-SUN terminal," significantly lowering the development barrier.

Note: Wi-SUN is still relatively new in China, and its ecosystem is not as mature as LoRa. However, overseas (especially Japan and Europe), it is already the mainstream standard for smart cities. If you have overseas projects or require standard protocol compliance, this module is well worth considering.

In-Depth Product Introduction — 1W High-Power LoRa MESH Module E52 Series

jamesliu — Mon, 01 Jun 2026 09:42:49 +0000

Section: Wireless Communications / Product Review

I recently worked on a wireless sensor network project covering a 3-square-kilometer industrial park, requiring long-distance transmission, multi-node networking, and high reliability. After comparing several solutions, I chose the EBYTE E52-400NW30S and E52-900NW30S as the core networking modules. The experience has been great, so I'm sharing it here.

What exactly are these modules?

These are EBYTE's 1W high-power LoRa MESH networking modules, with a transmit power of up to 30dBm (1W) and decentralized MESH technology. The only difference is the operating frequency band:

E52-400NW30S — 410~509MHz (default 433.125MHz), for China and European markets
E52-900NW30S — 850~929MHz (default 868.125MHz), for North America and Asia-Pacific markets

Five Key Highlights:

1W High Power: Ideal open-area communication distance of up to 4km (air data rate 7Kbps). Strong signal penetration, significantly better coverage in complex environments than standard 22dBm modules.
Decentralized MESH Networking: No central node required. Every device can act as a router. If any node goes offline, the rest of the network is unaffected — extremely high reliability.
Self-Healing Network: When a link is interrupted, routing nodes automatically rediscover paths, ensuring no data loss.
Multi-hop Routing: Data can hop through multiple relay nodes, easily covering large areas or complex terrain.
Four Communication Modes: Supports Unicast, Multicast, Broadcast, and Anycast, flexibly adapting to different application logic.

Key difference from the 22S version: The 30S has 8dBm higher transmit power (about 2.5x the power), with roughly 1.5km more range, but is larger (40.5×25mm) and consumes more power (710mA transmit current), making it better suited as a backbone relay node. In practice, you can mix 30S and 22S modules in the same network to balance range and cost.

This module has been running stably in my project for a month now. Highly recommended for anyone working on long-distance wireless networking.

E52-400NW30S vs E52-900NW30S — Full Parameter Comparison

jamesliu — Mon, 01 Jun 2026 09:42:33 +0000

Section: Technical Resources / Component Selection

When choosing between the E52-400NW30S and E52-900NW30S, aside from the frequency band, almost all technical parameters are identical. Here's a detailed comparison table based on the datasheet:
Core Parameter E52-400NW30S E52-900NW30S
Frequency Band 410.125~509.125 MHz 850.125~929.125 MHz
Default Frequency 433.125 MHz 868.125 MHz
Transmit Power 30dBm (1W), user adjustable 30dBm (1W), user adjustable
Air Data Rate 7K / 21.875K / 62.5K bps (3 levels) Same
Receive Sensitivity -121dBm @7K -121dBm @7K
Reference Range 4.0 km (open area, 7K, 3.5dBi antenna) 4.0 km (open area, 7K, 3.5dBi antenna)
Operating Voltage 3.3~5.5V (≥5.0V for full power) 3.3~5.5V (≥5.0V for full power)
Transmit Current 710 mA (instantaneous) 710 mA (instantaneous)
Receive Current ~14 mA ~14 mA
Interface UART (3.3V TTL) UART (3.3V TTL)
Max Baud Rate 460800 bps 460800 bps
Single Packet Size 200 Bytes 200 Bytes
Antenna Interface IPEX / Stamp Hole (50Ω) IPEX / Stamp Hole (50Ω)
Dimensions 40.5 × 25.0 mm 40.5 × 25.0 mm
Operating Temp -40℃ ~ +85℃ (industrial) -40℃ ~ +85℃ (industrial)

Selection Guide:

China & European markets: Choose the E52-400NW30S (433MHz band). This band has better diffraction capability, ideal for environments with many obstacles.
North America & Asia-Pacific markets: Choose the E52-900NW30S (868/915MHz band), compliant with local ISM band regulations.
Parameter tuning: For maximum range, set the air data rate to 7Kbps and lower the baud rate. For higher throughput, set the rate to 62.5Kbps, but range will drop to approximately 1.6km.

E52-400/900NW30S Frequently Asked Questions (FAQ)

jamesliu — Mon, 01 Jun 2026 09:42:17 +0000

Section: Technical Support / Q&A

While using the EBYTE E52-400NW30S and E52-900NW30S modules, engineers often run into the same issues. I've compiled this FAQ based on the datasheet and my own experience — hope it helps!

Q1: Actual transmission distance is far less than 4km. What can I do?

A: The 4km figure is an ideal value measured in clear open areas with 7Kbps air rate, 3.5dBi antenna gain, and 2.5m antenna height. In real-world use, these factors reduce range:

Obstacles: Walls, trees, and metal objects significantly attenuate the signal.
Air data rate: 7Kbps → 21.875Kbps can drop range to ~2km; 62.5Kbps may yield only ~1.6km.
Supply voltage: Make sure voltage is ≥5.0V, otherwise transmit power drops.
Antenna quality: Use an antenna with 3.5dBi gain or higher, and keep it away from metal objects.

Q2: The module gets very hot. Is this normal?

A: Yes, this is normal. The transmit current is up to 710 mA, so temperature rise during continuous transmission is expected. Recommendations: ① Leave space around the module for heat dissipation; ② Avoid long periods of continuous full-power transmission; ③ Reserve copper pour or thermal vias on the PCB design.

Q3: How do I avoid damaging the module?

A: ① Power supply: Voltage must not exceed 5.5V, otherwise the module may be destroyed. ② ESD protection: Wear an anti-static wrist strap when handling. ③ Never leave the antenna port open during transmission — an antenna must be connected, otherwise the power amplifier can be damaged by excessive standing wave ratio (SWR).

Q4: How do I check the module's current parameters?

A: Send the AT command AT+INFO=? via serial port. The module will return complete information including model, firmware version, transmit power, operating frequency, PANID, air data rate, and more. This is a powerful diagnostic tool.

Q5: The routing table is empty. What's wrong?

A: The routing table is only populated after data exchange occurs in the network. If the module was just powered on or there's no network traffic, an empty routing table is normal. Let multiple modules exchange data first, then read the routing table again.

Q6: How do I configure a module remotely?

A: When sending remote configuration commands, the target port must be set to Port 14 (other ports don't support remote configuration). Refer to Chapter 7 of the user manual for specific command formats.

Q7: The module won't enter configuration mode. What should I do?

A: Pull the M0 pin low, then power on the module — it should enter configuration mode. If it still doesn't work, check the M0 pin voltage level and verify the serial connection is correct.

E52 Series in Real-World Scenarios — Application & Selection Guide

jamesliu — Mon, 01 Jun 2026 09:41:57 +0000

Section: Application Cases / Solutions

In industrial IoT projects, choosing the right wireless networking方案 often determines success or failure. Based on my in-depth experience with the E52-400NW30S and E52-900NW30S, here are some typical application scenarios and selection tips.

Scenario 1: Industrial Park Environmental Monitoring

Requirements: Cover 3km², 50+ sensor nodes, data aggregated to a central control room.
Solution: Use 4 E52-400NW30S modules as backbone relay nodes (mounted high), each covering 8-10 E52-400NW22S end-node sensors. The network uses MESH self-organizing — any single relay node going offline won't affect the whole system.
Result: Full coverage with no dead zones. System has been running stably for 3 months with a packet loss rate below 0.1%.

Scenario 2: Smart Agriculture Greenhouse Cluster

Requirements: 20 greenhouses, each with temperature, humidity, light, and CO2 sensors. Gateway located in the central management room.
Solution: One E52-900NW22S node per greenhouse collects sensor data. E52-900NW30S modules provide inter-greenhouse relay, eventually converging at the gateway.
Result: Solved the severe signal blockage caused by greenhouse metal frames. Communication distance meets cross-greenhouse requirements.

Scenario 3: Building Automation

Requirements: 10-story office building, sensors and actuators on each floor, control center in the basement.
Solution: One E52-400NW30S per floor as a floor relay. MESH routing automatically hops between floors. The self-healing feature ensures that even if one floor's module loses power, other floors continue communicating normally.
Result: Good floor-to-floor signal penetration. No wiring needed — installation costs reduced by 70%.

Selection Summary:

400MHz version: For China and European markets. Better diffraction, ideal for obstacle-rich environments.
900MHz version: For North America and Asia-Pacific markets. Smaller antenna size, more friendly to local spectrum regulations.
30S vs 22S: Use 30S as backbone relays, 22S as end-node sensors. Mixed deployment balances range and cost.

E52 Series MESH Networking Features & Debugging Tips

jamesliu — Mon, 01 Jun 2026 09:41:25 +0000

Section: Technical Deep Dive / System Design

The MESH networking capability of the E52-400NW30S and E52-900NW30S is what makes them truly special. After some deep debugging sessions, I've整理 a few technical要点 and tips for anyone working on similar projects.

Four Communication Modes Explained

Unicast: Point-to-point communication. Data is sent only to the specified target node. Good privacy.
Multicast: Group communication. Data is sent to all members of a specified group. Great for批量 command distribution.
Broadcast: Data is sent to every node in the network. Suitable for alarm notifications.
Anycast: Data is sent to any one node that meets the criteria. Useful for load balancing scenarios.

Pro tip: Need to push configuration changes across the entire network? Use Broadcast mode to do it in one shot. Only need to control a single device? Use Unicast to avoid wasting network bandwidth.

Self-Healing Mechanism

When a node fails or a link is interrupted due to signal blockage, the E52 series automatically triggers path reconstruction. This process typically takes 2-5 seconds, during which a small number of data packets may be lost. Recommendation: Implement a data retransmission mechanism at the application layer (e.g., ACK confirmation) to ensure critical data reliability.

Handy AT Commands for Debugging

Here are the most frequently used debug commands:
Command Description
AT+INFO=? Query full module parameters (model, firmware, power, frequency, rate, etc.)
AT+PANID=? Query or set the network ID (different PANIDs isolate networks)
AT+ROUTE=? Query the current routing table (requires network traffic)
AT+NETINFO=? View network status information

Common Troubleshooting Steps

Can't form a network: Check if PANIDs match; check if air data rates are the same; check if working channels are consistent.
A specific node has communication issues: Use AT+ROUTE=? to check its routing table; verify its supply voltage; check if the antenna is intact.
High packet loss across the network: Check for co-channel interference; lower the air data rate to improve抗干扰能力; verify the master node's power supply stability.
Mixed Networking Recommendations

In real projects, I recommend mixing E52-30S and E52-22S modules. Use 30S modules for the backbone network (open areas like park main roads, building corridors), and 22S modules for end-node sensors. As long as they share the same PANID and air data rate, they'll automatically form a unified MESH network — achieving efficient "backbone + endpoint" coverage.

Summary: The E52 series has powerful networking capabilities, but you need to understand MESH protocol principles and the AT command set. Master these debugging tips and your project will go much smoother. Feel free to share your own debugging experiences in the comments!

How Does the EWM22A "3-in-1" Module Simplify IoT Design?

jamesliu — Fri, 08 May 2026 03:36:16 +0000

In complex scenarios—such as smart homes and industrial sensor networks—devices often require simultaneous support for direct mobile connectivity (BLE), internet access (Wi-Fi), and long-range networking (LoRa). Traditional solutions necessitate the integration of three separate modules, a practice that not only consumes valuable PCB real estate but also increases design complexity and cost. Ebyte’s EWM22A series modules offer an elegant solution: integrating BLE 5.0, Wi-Fi, and LoRa into a compact package measuring just 14 x 20 mm.
This "3-in-1" module supports up to nine distinct operating modes. For instance, it can transmit serial data over long distances via LoRa while simultaneously allowing a mobile phone to monitor that data via Bluetooth; alternatively, it can connect to a router via Wi-Fi to upload data directly to the cloud. With a deep-sleep current consumption as low as 6.7μA, it is perfectly suited for battery-powered applications. For product developers seeking high levels of integration and flexibility, the EWM22A not only streamlines hardware design but also delivers unprecedented deployment versatility, making it the ideal choice for building the next generation of IoT devices.

A Brief Discussion on the Ultra-Low Power and Long-Range Design of LoRa Modules

jamesliu — Fri, 08 May 2026 03:35:47 +0000

In IoT projects, engineers often face a dilemma: achieving long-range communication typically requires high power output, leading to skyrocketing power consumption; conversely, prioritizing low power consumption often results in a severely compromised communication range. Ebyte’s LoRa modules—such as the E22 and E220 series—cleverly resolve this inherent conflict by leveraging Semtech’s next-generation LoRa spread spectrum technology.
At the core of this capability lies the "Wake-on-Air" function. For the majority of the time, the module remains in a deep sleep state (with sleep current consumption as low as 2µA in the E22 series), periodically waking up only to listen for wake-up signals. This mechanism enables battery-powered devices—such as remote field sensors—to achieve a battery life spanning several years while simultaneously maintaining a communication range of several kilometers. Furthermore, by flexibly adjusting the air data rate (ranging from 2.4 Kbps to 62.5 Kbps) and transmit power via AT commands, developers can strike the optimal balance between power consumption and communication distance. For instance, power output can be reduced in short-range scenarios to conserve energy, while the data rate can be lowered in long-range scenarios to gain higher receiver sensitivity. This design philosophy makes it possible to truly "have the best of both worlds."

E160-TxF12S2 OOK Wireless Transmitter Module

jamesliu — Tue, 14 Apr 2026 01:54:55 +0000

Introduction
Against the backdrop of rapid expansion in the global consumer electronics and smart home markets, Grand View Research data shows that the global wireless remote control device market size reached US$19.8 billion in 2025, with an expected CAGR of 7.2% by 2030. Among them, Sub-1GHz OOK/ASK modulation solutions, with their advantages of low cost, low power consumption and strong anti-interference capability, account for more than 70% of the consumer remote control product market share. Chengdu Ebyte Electronic Technology Co., Ltd., a leading domestic provider of wireless communication solutions, has launched the E160-TxF12S2 OOK wireless transmitter module for low-cost remote control scenarios, which has become an ideal choice for small home appliances, toys, access control and other fields with its ultra-high cost-effectiveness and industrial-grade reliability.

Based on official manual parameters, this article comprehensively analyzes the technical features, application solutions and deployment guidelines of the E160-TxF12S2, providing selection references for consumer electronics developers.

Table of Contents

Core Product Features

Detailed Technical Specifications

Hardware Design and Pin Definition

Software Development and Coding Rules

Typical Applications and Reference Circuits

Frequently Asked Questions and Solutions

Soldering and Mass Production Guide

Selection Reference and Supporting Solutions

Core Product Features The E160-TxF12S2 is an OOK/ASK modulated wireless transmitter module specially designed for low-cost remote control scenarios. It has a built-in high-performance RF chip and power amplifier, factory-cured EV1527 standard encoding and 20bits unique address code, enabling rapid productization without additional encoding development. The core advantages are as follows:

Feature Category
Specific Parameters

Modulation Method
OOK/ASK (Amplitude Shift Keying/On-Off Keying)

Operating Frequency Band
315MHz (E160-T3F12S2) / 433.92MHz (E160-T4F12S2)

Transmit Power
+13dBm (@3.3V power supply)

Communication Range
Up to 210m in ideal environment (paired with E160-RxMD2 receiver module, 1.5dBi antenna, 2m height)

Power Consumption Performance
Transmit current 10mA, sleep current only 1μA

Encoding Features
Built-in EV1527 standard encoding, factory-cured 20bits unique address code (million groups without repetition)

Button Support
3 independent input pins, expandable to 6 buttons through combination

Reliability Design
±4KV ESD electrostatic protection (±6KV for RF pin), industrial temperature range of -40℃~+85℃

Power Supply Features
Wide voltage 1.8V~3.6V, supports button battery power supply

Dimensions
20.4×13.3×2.5mm ultra-small size, stamp hole SMD package

Each module has a globally unique 20bits address code, with an address repetition probability of only one in a million, effectively avoiding crosstalk between different devices.

Detailed Technical Specifications 2.1 RF Parameters

RF Parameter
Parameter Value
Remarks

Operating Frequency
315MHz / 433.92MHz
Two models available

Modulation Method
ASK/OOK
Amplitude shift keying modulation

Maximum Transmit Power
13±1.0dBm
Typical value, @3.3V power supply

Harmonic Suppression

45dBc
@433MHz, second harmonic

Transmission Rate
28kbps
Fixed value

Frequency Offset

±0.05MHz

Antenna Impedance

50Ω

Reference Communication Range
210m
Paired with E160-RxMD2 receiver module, clear open environment

2.2 Electrical Parameters

Electrical Parameter
Minimum
Typical
Maximum
Remarks

Operating Voltage
1.8V
3.3V
3.6V
≥3.3V ensures maximum output power, exceeding 3.6V has burn-out risk

Communication Level
1.8V
3.3V
3.6V
Consistent with power supply voltage

Transmit Current

10.0mA

Instantaneous power consumption @3.3V power supply, 433.92MHz, 13dBm transmission

Sleep Current

1μA

Automatically enters sleep when no data is sent

ESD Protection
-4KV

+4KV
HBM standard, ±6KV for RF pin

Operating Temperature

-40℃

+85℃
Industrial-grade design

Operating Humidity

10%rh

90%rh

Storage Temperature

-65℃

+150℃

2.3 Hardware Parameters

Hardware Parameter
Parameter Value
Remarks

Crystal Frequency
26.25MHz (315MHz version) / 26.2982MHz (433MHz version)

Module Dimensions
20.413.32.5mm
LWH

Antenna Form

Stamp hole

Communication Interface
GPIO
1.8~3.6V level, 3.3V recommended for reliability

Package Form
SMD/stamp hole
Pin pitch 2.54mm

Weight

3.65g

Hardware Design and Pin Definition 3.1 Pin Layout The E160-TxF12S2 adopts a 9-pin SMD package. The core pin definitions are as follows:

Pin Number
Pin Name
Direction
Function Description

1
K0
Input
Button input pin, active low, at least 100ms duration, key value "0001"

2
K1
Input
Button input pin, active low, at least 100ms duration, key value "0010"

3
K2
Input
Button input pin, active low, at least 100ms duration, key value "0100"

4
NC
Output
LED output pin, active low, outputs low when button is pressed, outputs high when released

5
VDD
Power
DC 1.8~3.6V power input

GND

Power ground

GND

Power ground

GND

Power ground

9
ANT
Output
Antenna pin, only transmits signals, no receiving function

Combined button expansion: Through button matrix design, up to 6 button functions can be realized, corresponding key values: K3="1000", K4="0101", K5="0110"

3.2 Hardware Design Notes

Power Design: It is recommended to use a DC regulated power supply with ripple coefficient less than 100mV, reserve more than 30% power margin, ensure reliable grounding of the module, and do not reverse the positive and negative poles of the power supply.

Wiring Specification: High-frequency digital traces, analog traces and power traces should avoid passing under the module. If necessary, lay copper on the contact layer of the module and ground it well, and the traces should be placed on the bottom layer.

Electromagnetic Compatibility: The module should be kept away from strong electromagnetic interference sources such as power supplies, transformers and high-frequency wiring, and maintain an appropriate distance from 2.4GHz devices such as USB 3.0.

Antenna Deployment: The antenna should be exposed as much as possible and vertically upward. If installed in a metal case, an antenna extension cable must be used to lead it out to avoid significant signal attenuation.

Software Development and Coding Rules The E160-TxF12S2 has built-in EV1527 standard encoding, no additional encoding development is required, and it can be directly used with the E160-RxMD2 receiver module, or users can develop their own decoding logic.

4.1 Data Frame Structure
The data frame sent by the module follows the EV1527 encoding rule, consisting of a synchronization code, 20-bit address code and 4-bit key value code, with a basic unit time T≈35μs:

Synchronization code: 32T high level + 80T low level

Data bit "1": 3T high level + 1T low level

Data bit "0": 1T high level + 3T low level

The complete frame structure is as follows:

32*T
204T
44T

Synchronization code
20-bit address code (C0~C19)
4-bit key value code (D0~D3)

4.2 Usage Methods

Direct button connection: Connect one end of the button to the K0/K1/K2 pin of the module, and the other end to ground. Pressing the button will automatically send the corresponding encoded signal, no MCU participation required.

MCU control: The MCU pin can simulate the button level change to realize data transmission, suitable for scenarios requiring dynamic control.

Receiver decoding: After demodulation with the E160-RxMD2 receiver module, the MCU parses the 20-bit address code and 4-bit key value code to realize the corresponding control function.

Note: Since the module communication rate is 28kbps, it needs to be used with the E160-RxMD2 receiver module that supports this rate. High-speed receiver modules such as E160-RxMS1 are not applicable.

Typical Applications and Reference Circuits 5.1 3 Independent Buttons Application Circuit Suitable for simple remote control scenarios with less than 3 buttons, the circuit design is the simplest:

K0/K1/K2 pins are respectively connected to independent buttons, and the other end of the button is grounded

NC pin is connected in series with a 470Ω resistor and LED indicator for button status indication

The power supply uses a 3V button battery, with standby power consumption of only 1μA, and the battery life can reach more than 1 year

5.2 6 Combined Buttons Application Circuit
Through the matrix button design, 6 button functions are realized with 3 pins, suitable for multi-function remote controls:

K0+K1 combination realizes K3 function (key value 1000)

K0+K2 combination realizes K4 function (key value 0101)

K1+K2 combination realizes K5 function (key value 0110)

Supports 3 independent buttons and 3 combined buttons at the same time, meeting the needs of most consumer remote control applications

5.3 Typical Application Scenarios
The high cost-effectiveness and low power consumption features of the E160-TxF12S2 make it widely applicable to the following scenarios:

Small Home Appliance Remote Control: Wireless remote control for fans, lighting, bath heaters, humidifiers and other small home appliances

Toy Remote Control: Low-power remote control applications for remote control cars, remote control planes, electric toys, etc.

Access Control System Remote Control: Wireless remote controls for community access control, garage doors, electric rolling doors

Electric Bicycles: Anti-theft remote controls for electric bicycles and electric motorcycles

Smart Switches: Control terminals for wireless remote control switches and smart sockets

Frequently Asked Questions and Solutions 6.1 Unsatisfactory Transmission Range Possible Causes:

There are linear obstacles, same-band interference, or metal shielding near the antenna

Power supply voltage is lower than 3.3V, resulting in reduced transmit power

Poor matching between antenna and module, or poor antenna quality

Tested in environments with strong radio wave absorption such as near the ground or seaside

Solutions:

Elevate the antenna installation height, avoid obstacles and interference sources

Ensure the power supply voltage is ≥3.3V, use a regulated power supply

Replace a matched high-gain antenna, use an antenna extension cable when deployed inside a metal case

Test in an open environment, avoid using in strong absorption environments

6.2 Module Easy to Damage
Possible Causes:

Power supply voltage exceeds 3.6V, or the positive and negative poles of the power supply are reversed

No electrostatic protection during installation, causing chip breakdown

Operating environment humidity exceeds 90%, or temperature exceeds the industrial grade range

Solutions:

Add over-voltage and reverse polarity protection circuits, strictly control the power supply voltage between 1.8~3.6V

Implement electrostatic protection during installation and operation, ensure good module grounding

Avoid using in environments exceeding -40℃~+85℃ or high humidity

6.3 High Bit Error Rate
Possible Causes:

There is same-frequency signal interference nearby

Unstable power supply with excessive ripple

Antenna feeder is too long or of poor quality, resulting in signal attenuation

Solutions:

Replace modules of different frequency bands (switch between 315MHz/433MHz) to avoid interference frequency bands

Optimize power supply design, add filter capacitors to reduce power supply ripple

Shorten the antenna feeder length, use low-loss coaxial cable

Soldering and Mass Production Guide 7.1 Reflow Soldering Parameters The module supports lead-free reflow soldering, with the following soldering parameters:

Curve Feature
Leaded Soldering
Lead-free Soldering

Solder Paste Type
Sn63/Pb37
Sn96.5/Ag3/Cu0.5

Preheat Temperature Range
100℃~150℃
150℃~200℃

Preheat Time
60-120 sec
60-120 sec

Average Ramp-up Rate
≤3℃/sec
≤3℃/sec

Liquidous Temperature
183℃
217℃

Time Above Liquidous
60-90 sec
30-90 sec

Peak Temperature
220-235℃
230-250℃

Average Ramp-down Rate
≤6℃/sec
≤6℃/sec

Total Time from 25℃ to Peak
≤6 minutes
≤8 minutes

7.2 Mass Packaging Method
The modules are packaged in tape and reel, 1000pcs per reel, with packaging specifications:

Tape dimensions: width 44.5~48.5mm, thickness 2.9±0.1mm

Reel diameter: 330±0.2mm

Suitable for fully automatic SMT mounter production, improving mass production efficiency

Selection Reference and Supporting Solutions 8.1 Peer Product Comparison

Product Model
Transmit Power
Communication Range
Number of Buttons
Sleep Current
Package Size

E160-TxF12S2
13dBm
210m
6 (3 pins expanded)
1μA
20.4*13.3mm

E160-TxF20S2
20dBm
500m
6
2μA
22*15mm

Competitor Ordinary Transmitter Module
10dBm
100m
3
5μA
25*15mm

8.2 Recommended Supporting Receiver Modules

Receiver Module Model
Receive Sensitivity
Compatible Rate
Application Scenario

E160-RxMD2
-112dBm
2.4~48kbps
Best match with E160-TxF12S2, high sensitivity and low power consumption

E160-RxMS2
-108dBm
1~10kbps
Long-distance transmission scenarios, strong anti-interference capability

8.3 Recommended Antennas

Antenna Model
Type
Gain
Application Scenario

TX433-JZ-5
Spring Antenna
1.5dBi
Small remote controls, built-in installation

TX433-JK-10
Copper Rod Antenna
2.0dBi
Medium-distance transmission, external installation

TX433-XPH-300
Suction Cup Antenna
3.0dBi
Long-distance transmission, fixed equipment

About Ebyte
Chengdu Ebyte Electronic Technology Co., Ltd. is a national high-tech enterprise focusing on wireless communication applications. Its products cover the full range of wireless modules including LoRa, Bluetooth, Wi-Fi, Sub-1GHz, etc., which are widely used in consumer electronics, industrial IoT, smart home, smart agriculture and other fields. The company has more than 100 technical patents, and its products have passed international certifications such as FCC, CE and RoHS, and are exported to more than 160 countries and regions. It can provide customers with customized development and one-stop wireless communication solutions.

Official Website: https://www.cdebyte.com

Technical Support: support@cdebyte.com

Sales Hotline: +86-4000-330-990

Address: 2nd Floor, Building B2, 199 Xiqu Avenue, High-tech Zone, Chengdu, Sichuan, China