DEV Community: Junluan Tsui

"Light" Experience in Smart Home: How Does Bluetooth Fill You with Happiness with Low Visibility?

Junluan Tsui — Thu, 24 Jul 2025 13:16:58 +0000

With the rapid development of technology, smart home has gradually entered our lives. The smart home system integrates multiple devices, making home life more convenient, safe, and efficient. In the pursuit of smart life, especially among the young consumer group, Bluetooth technology, with its features of low power consumption, high compatibility, and ease of use, will play an even more important role in the future smart home.

Especially in the context of the surge in Internet of Things (IoT) devices, Bluetooth devices can not only achieve more intelligent connections but also enable remote control and data collection, promoting the further popularization of smart homes. In addition, the continuous development of Bluetooth technology has also enhanced its application potential in smart homes. For example, the introduction of Bluetooth 5.0 has significantly increased the communication range and speed.

Working Principle:
The core of Bluetooth technology is short - range wireless communication, which is commonly used for data transmission between wireless devices. It works based on the Frequency - Hopping Spread Spectrum (FHSS) principle. By quickly switching between different frequencies, it ensures the stability and anti - interference of communication. Bluetooth devices can automatically pair within a certain distance and achieve data transmission. This process usually includes the following steps:

Device Discovery: After a Bluetooth device is turned on, it searches for other devices through broadcast signals.

Pairing: After finding the target device, the two devices pair with each other. Usually, user confirmation is required, such as entering a password or clicking a confirmation button.

Data Transmission: After pairing, the devices can conduct encrypted data communication to ensure the security of the transmission.

There are different Bluetooth standards for various usage scenarios. Currently, Bluetooth Classic and Bluetooth Low Energy (BLE) are widely used. The latter, due to its lower power consumption, is particularly suitable for battery - powered smart home devices.

Application Scenarios:

Smart Lighting Control: Smart bulbs are one of the most common applications of Bluetooth in smart homes. Users can control the on/off, brightness, and color of the lights through a mobile app. Bluetooth technology allows users to locally control multiple lamps via Bluetooth connection and even automatically adjust the lighting effects according to scenarios, enhancing the home atmosphere.

Smart Home Appliances: The application of Bluetooth in smart home appliances is also gradually becoming part of daily life. For example, a smart refrigerator can be connected to a mobile phone via Bluetooth to update food storage information in real - time and recommend recipes to users. A smart washing machine can set washing modes, monitor the washing progress, and even remind users in a timely manner through an app.
Security Monitoring System: Bluetooth also plays an important role in security monitoring. Through Bluetooth, users can connect security cameras, door locks, and other devices to an app to remotely monitor home security. When out, users can control the door lock and receive real - time monitoring videos to ensure home safety.

Health Monitoring Devices: With the improvement of health awareness, Bluetooth technology has been widely applied to health monitoring devices, such as smart bracelets and weighing scales. These devices connect to mobile apps via Bluetooth to synchronize data, helping users record health data such as heart rate, steps, and weight, providing convenience for health management.

Voice Assistants and Automation: Bluetooth technology facilitates the application of smart voice assistants. In a smart home, users can control various Bluetooth - enabled devices through voice assistants, enjoying the convenience of voice operation. In addition, Bluetooth can be combined with other sensors to achieve home automation. For example, when users leave home, the system automatically turns off all Bluetooth - controlled devices to save energy.

Bluetooth Product Recommendation:
KT6368A is a Bluetooth chip designed based on the Bluetooth 5.1 protocol version. It has a small size and low power consumption and operates in the 2.4GHz frequency band. This module uses common AT commands to set parameters, with simple and fast operation. It can be applied to scenarios such as smart door locks, smart bike locks, smart homes, consumer electronics, and industrial control.

The application of Bluetooth technology in smart homes has elevated home life to a new level. With the continuous increase in the number of devices and the progress of technology, Bluetooth provides users with convenient and intelligent experiences in smart lighting control, smart home appliances, security monitoring, health monitoring devices, and automation.

Product details, product information, and sample acquisition and ordering links:KT6368A

🚀 Building a Smarter Scale: Bluetooth-Enabled Weight Tracking for IoT Devs

Junluan Tsui — Thu, 24 Jul 2025 09:25:52 +0000

Tired of dealing with wired scales and manual data entry? Our latest Bluetooth-powered weighing system leverages BLE/SPP for seamless wireless data transfer—perfect for industrial, retail, or DIY IoT projects!

🔧 Tech Breakdown:
✅ Dual-mode Bluetooth (Low-energy BLE + Classic SPP)
✅ HID-compliant for plug-and-play compatibility
✅ Sub-1% error margin for precision measurements

💻 Developer-Friendly Use Cases:
🔹Smart inventory/logistics tracking (auto-sync to cloud)
🔹Retail POS integration (real-time weight-based pricing)
🔹Hackable for custom projects (e.g., wireless selfie stick triggers!)

📹 Watch the 60-second demo to see the module in action:

🛠 Want to Build This?
🔹Recommended chipsets: nRF52, KT6368A, ESP32 (BLE+SPP support)
🔹Protocol deep dive: How we optimized throughput to avoid lag

# Sample BLE data capture snippet (Python + Bleak) async with BleakClient(scale_address) as client: weight_data = await client.read_gatt_char(CHAR_UUID) print(f"Live weight: {int.from_bytes(weight_data, 'big')}g")
Let’s discuss! **👇
🔹Would **Bluetooth mesh make sense for multi-scale setups?
🔹Best practices for minimizing interference in industrial environments?

KT142C Voice Chip Smart Application Solution for Coffee Machines

Junluan Tsui — Wed, 23 Jul 2025 15:48:01 +0000

I. Development Background

With the rapid development of the smart home market and increasing consumer demand for interactive experiences in home appliances, voice prompt functionality has become a key selling point for modern coffee machines. Traditional coffee machines relying solely on indicator lights and simple buzzer alerts can no longer meet user expectations for operational guidance, status feedback, and personalized experiences.

The KT142C voice chip, as a high-performance, cost-effective voice solution, provides coffee machine manufacturers with perfect voice interaction capabilities through its:

Built-in 320KB storage
MP3 format playback support
Flexible control methods

This solution enables clear information delivery even in noisy kitchen environments while enhancing user-friendliness and product differentiation.

II. Chip Application

The KT142C voice chip features:

SOP16 package
24-bit DAC with 90dB dynamic range and 85dB SNR
Two audio output modes:
- Direct PWM drive: Supports 8Ω/0.5W speaker (no external amplifier needed)
- DAC output: Connectable to external amplifiers (e.g., HAA2018) for higher power output

In coffee machine applications, KT142C enables:

Voice-guided operation steps
Real-time status feedback during brewing
Fault alarm notifications
Personalized welcome messages

The chip supports MP3 audio at 8-32kHz sampling rates, with 30-level volume control (0x06 command) and built-in audio DSP processing to ensure clear voice output in kitchen environments.

III. Functional Implementation

1. Voice Content Management

File naming convention: 001.mp3, 002.mp3... (up to 999 files)
Direct drag-and-drop updates via USB virtual drive (supports WinXP/Win7/Win10)
Folder categorization (max 99 folders, 255 files each)

2. Playback Control Methods

GPIO triggering: 4 configurable IOs (PA6/PA5/PA4/PA11) support one-touch playback
- Six trigger modes configurable via config.txt (interruptible, non-interruptible, hold-to-loop, etc.)
UART control: Default 9600bps baud rate (adjustable), rich command set:

  // Play specific file examples
  7E 03 00 02 00 01 EF  // Play 001.mp3
  7E 0F 00 02 01 01 EF  // Play 001.mp3 in folder 01

  // Combined playback example (seamless multi-voice)
  7E 21 00 05 01 03 02 05 04 EF // Play 001/003/002/005/004 sequentially

3. System Integration Key Points

Power design: Wide voltage input (2.6V-5.2V), recommendations:
- 5V systems: Add series diode (e.g., 1N4001) for surge protection
- 3V systems: Ensure ≥200mA current supply
Grounding: Audio ground (AGND) and digital ground (GND) shorted at power input
Status detection: BUSY pin (PA12) outputs playback status:
- Low: Playback active
- High: Idle state

IV. Typical Application Scenarios

1. Operational Guidance

2. Fault Alerts

Low water: Loop "Please add water" (0x08 command)
Temperature abnormal: Urgent alert tone (random play 0x18)
Grounds container full: Combined "Please empty - coffee grounds" (0x21 command)

3. Power Saving Mode

Enable low-power mode via config.txt (standby current only 2μA)
Auto sleep after 5s inactivity
GPIO/UART wake-up support

V. Solution Advantages

Plug-and-Play Development
- No programming: Direct voice updates via USB
- Provided test board (works with just 2 capacitors)
Professional Audio Quality
- Hardware MP3 decoding ensures system stability
- Supports Jazz/Classic/Pop/Rock sound effects
Industrial-Grade Reliability
- Operating temperature: -40℃~+80℃
- Built-in watchdog against freezing
- 4KV ESD protection (HBM)
Mass Production Support
- Pre-programmed voice files available
- Complete reference design (schematic + PCB files)

VI. Recommended Voice Content

Category	Example Phrases	Trigger Method
Welcome	"Welcome to XX Coffee Machine"	Power-on auto-play
Guidance	"Select coffee strength", "Place cup"	Button trigger
Brew Status	"Grinding", "Extracting", "Foaming"	Auto-trigger on state change
Completion	"Your coffee is ready"	BUSY pin monitoring
Maintenance	"Please refill water", "Descale needed"	Timed loop playback

By integrating the KT142C voice chip, coffee machines achieve intelligent upgrades while providing users with more convenient and intuitive operation. Its flexible configuration and excellent cost-performance ratio make it an ideal choice for small-to-medium batch smart coffee machine development.

JL (JieLi) Bluetooth TEST Box Button Function Description

Junluan Tsui — Wed, 23 Jul 2025 13:50:57 +0000

Button Function Description

Reset Button:
- Initiates a reset of the module, restoring it to its initial state.
Button B (Prototype Testing):
- Triggers the next test item for the B prototype. The tests cycle in sequence as follows:
- "Play Song Test → Call Test → Disconnect".
Button A (Prototype Testing):
- Triggers the next test item for the A prototype. The tests cycle in sequence as follows:
- "Play Song Test → Call Test → Disconnect".
Disconnect Button:
- Short press: Disconnects the current Bluetooth connection.
- Long press while connecting a PC cable: Enters Configuration Mode.

Culture&Tech meets ancient mysticism!

Junluan Tsui — Wed, 23 Jul 2025 02:17:33 +0000

🔥Culture&Tech meets ancient mysticism! 🔥

This 1-meter holographic fan brings Chinese wisdom to life with stunning Qi Men Dun Jia symbols!

💫✨ Powered by cutting-edge chip technology and a complete chip supply chain—this is where tradition meets innovation.

Smart Mite Remover - KT148A - SOP8 Voice Chip Solution Usher in a New Era of Mite Removers

Junluan Tsui — Tue, 22 Jul 2025 13:38:35 +0000

With the rapid development of Internet of Things technology, the mite remover, as an important tool for household cleaning, its intelligent and user - friendly design has become the key to enhancing market competitiveness. The mite remover equipped with a voice chip can provide functions such as startup prompts, work status feedback, operation guidance, and fault alerts. This allows users to more intuitively understand the working status of the mite remover and perform more accurate operations. It not only improves the intelligence level of the mite remover but also brings users a more convenient and comfortable using experience.

Smart Mite Remover Voice Solution

Chip Selection：The KT148A - SOP8 voice chip fully combines the diverse needs of the home appliance industry to create a low - cost and cost - effective programmable voice chip. It can store 420 seconds of voice content while ensuring high - quality sound. It has a set of PWM output ports that can directly drive a 0.5W speaker, ensuring clear sound quality. In addition, the chip has the characteristics of programmability and repeatable burning. It has hardware IIC and UART interfaces, and can customize various special functions to meet different customer demands for personalized functional products.

Chip Features：
- Powerful Chip Performance：As a 32 - bit DSP voice chip, it has an internal oscillation frequency of 5MHZ, and can be increased to 120MHZ through PLL.
- Flexible Operating Voltage：The operating voltage range is 2.0 - 5.5V. However, it should be noted that there are hardware details differences when the power supply is below 3.3V.
- Ultra - low Power Consumption：The standby power consumption is less than 25μA, and there is also a low - power mode of only 1.5μA, with significant energy - saving effects.
- High - quality Audio Output：16 - bit PWM output can directly drive an 8 - ohm / 0.5W speaker to ensure the quality of sound output.
- Convenient Audio Conversion：It provides tools for users to convert audio formats by themselves. The operation is simple, and all users can easily get started.
- Adequate Voice Duration：It can support up to 200 seconds of voice playback at 16KHZ and up to 400 seconds at 8KHZ.
- Flexible Voice Replacement：Customers can directly replace the voice content through the serial port with the help of computer - based tool software.
- Diverse Control Protocols：It supports one - wire serial port control and can customize various protocols according to needs.
- Address Expansion Function：It supports 224 segment addresses. If there are more needs, it can be expanded. For details, see section 4.5.
- Rich Interface Customization：It has hardware IIC and UART interfaces and can customize various functions for customers.
- Repeatable Burning：The chip has the ability to be burned repeatedly, so there is no need to worry about batch problems caused by incomplete testing.

The KT148A voice chip has a wide range of applications. Besides shining in the field of mite removers, it is also applied in many fields such as disinfection machines, smart floor cleaners, children's toys, automotive electronics, smart homes, medical devices, and security alarms, fully demonstrating its huge application potential and value.

Product details, product information, and sample acquisition and ordering links:
KT148A: More

Interpretation of JL (Jieli) Chip Silk - printing: How to Judge the True Model through Silk - printing

Junluan Tsui — Mon, 21 Jul 2025 13:42:30 +0000

For those who have searched for JL (Jieli) chips, it is found that it is difficult to find the original model information and locate the specific model directly through the silk - printed letters on the chip surface (of course, there are cases like JL6976M that can be directly searched for the model from the silk - printing).

This is because that string of letters is composed of production date, batch number, etc., so direct search won't work. The following is the breakdown of the silk - printing of JL chips. In fact, it follows certain rules, and after decomposition, the specific model can be judged.

The following methods are from: Chip markings explained | jielie (kagaimiq.github.io) and personal summary.

Meanings of each part of the silk - printing breakdown:

Serial number (capital - letter part ABCDE):
- A: The letters are usually "AB", "AC", "AD", "AS", etc. The first letter is always "A", and this part can be omitted.
- B: Represents the manufacturing year. Usually, it is the last two digits of the year. For example, "18" represents 2018. But sometimes it may be further truncated. For instance, "2" may represent 2012. This part can also be omitted.
- C: Represents the manufacturing week. It is usually omitted on newer chips. If there is no year code, this part will also be omitted.
- D: The letters are "A", "B", etc., which may be part of the batch number.
- E: Represents the batch number Lot. Sometimes it can be used to distinguish models like AC109N and AC608N. The former has a ".1" suffix, while the latter doesn't. In some micro - packages (such as QFN32), some parts of the serial number may be omitted, and only the batch number exists at this time.
Part number (lower - case part fgh, after the "-"):
- f: Represents the chip series variant, such as AC6901, AC6902, AC6965, etc.
- g: Represents the chip body letter (A, B, C, D, etc.).
- h: Contains other information, such as flash size, SDRAM size, PSRAM size, etc. The flash size is expressed in megabits (for example, "8" means 8 Mb = 1 MB). Chips without any flash are marked with "0" here (such as AC691N without flash), or marked with something more relevant to the chip (such as SDRAM size). This also applies to the complete chip marking, where the first part is the actual chip name (such as JL6976, JL700N, etc.).

Summary of the query method:
Through the interpretation of JL silk - printing, we find that when the silk - printing cannot directly query the model, the letters after the "-" symbol are highly related to the letter suffix of the true model.

Step 1: Search for "Jieli" on the home page of Xinchacha. After entering the brand home page, click on the section model.
Step 2: Input according to the number part after the "-" symbol plus the first letter (2 - 3 letters). For example, if it is 25B4 after the "-" symbol, input 25B; if it is 26CB, input 26C; if it is 1A8, input 1A.
Step 3: Based on the model obtained from the query, judge whether the package is the same as the chip package to be queried through the package, and then check the data manual.

The above query method is applicable to most JL chips. Of course, some chips are special and need specific analysis and judgment. If there is a way to contact the original factory, you can directly consult the original factory.

Reverse Horn Voice - Prompting IC - KT148A Broadcasting Chip, Building a Solid Safety Line

Junluan Tsui — Sun, 20 Jul 2025 15:47:48 +0000

When vehicles and mechanical equipment are reversing, the driver's line of sight is often blocked by the vehicle body, cargo, or environmental factors, creating a large blind spot. For large - scale equipment such as forklifts, excavators, and heavy - duty trucks, due to their large size and limited visibility, the accident risk is even higher. Moreover, traditional reverse alarm sounds are mostly monotonous beeps, which have low recognition in noisy industrial environments or traffic roads and are difficult to attract the sufficient attention of people around.

To address this safety pain point, reverse horns are evolving from simple buzzers to intelligent devices with voice - prompting functions. Voice prompts can convey reversing information clearly and explicitly in words. Compared with a single beep, they can more effectively attract the attention of people around, enhance the warning effect, and reduce the probability of reversing accidents.

Demand Design for Reverse Horn Voice Solutions：

Without the warning of a reverse horn, people around may not be able to detect the vehicle's reversing in time. When the line of sight is blocked or attention is distracted, accidents such as vehicles colliding with pedestrians or running over objects are likely to occur.
Without a reverse horn, the driver can only use methods such as waving hands or shouting to remind people around to give way. However, these methods are limited by factors such as environmental noise and distance, and cannot ensure the effective transmission of information. This leads to low reversing operation efficiency and may also cause misunderstandings and conflicts due to poor communication.
In case of a reversing accident, if there is no effective warning device such as a reverse horn, it is difficult to prove whether the driver has fulfilled the necessary safety - prompting obligation during the accident liability determination, increasing the complexity of liability division and the risk of disputes.

KT148A Voice Chip Solution for Reverse Horn：
Adding the KT148A voice - broadcasting chip to the reverse horn can achieve functions such as "reverse reminder, left - turn reminder, right - turn reminder". When reversing, through this alarm chip, passers - by can know the vehicle's driving direction in time, playing a reminder role. It not only makes the driver actively aware of safety but also reminds passers - by to pay attention to passing pedestrians and vehicles.

The KT148A voice chip, with its numerous outstanding features, is often selected by manufacturers of alarm - type products. It is an industrial - grade voice chip suitable for mass production by voice horn manufacturers and an excellent option for the voice chip of reverse horns.

Ultra - low Power Consumption：It features ultra - low power consumption, with standby power consumption less than 25μA and a low - power mode of only 1.5μA, effectively saving energy.
Seamless Voice Integration：It can achieve seamless voice integration, easily integrating into various equipment systems.
Ultra - simple Peripheral Circuit：The peripheral circuit is ultra - simple. It interfaces with the main control system of the reverse horn conveniently and efficiently, greatly reducing the product research and development cost and development cycle. Enterprises can quickly complete the chip's program burning and function debugging according to their own needs, realizing the intelligent upgrade of the reverse horn.
Ultra - low Cost：It has an ultra - low cost, providing strong support for enterprises to reduce production costs.
Powerful Voice Functionality：It has a built - in 420K Byte voice storage space, supports 224 segment addresses and can be expanded to meet more needs. It supports up to 200 seconds of voice playback at 16KHz and up to 400 seconds at 8KHz. Tools are provided for users to convert audio formats themselves, which is very simple for all users. Users can also replace the voice content directly via the serial port on a computer without the need for other expensive tools.
High - fidelity Voice Output：As a 32 - bit DSP voice chip, it uses 16 - bit PWM output and can directly drive an 8 - ohm / 0.5W speaker to achieve clear, loud, and distortion - free voice playback. It has an 8 - level volume adjustment function, allowing for flexible adjustment of the voice playback volume according to different scenarios to achieve the best warning effect.
Stable and Reliable Operating Performance：The chip adopts a highly integrated design, with a 5MHz internal oscillator and PLL up to 120MHz. It has excellent anti - interference capabilities, an operating voltage range of 2.0 - 5.5V (note that there are detailed hardware differences when supplying below 3.3V), and can work stably in complex environments such as high - temperature, humid, and electromagnetic - interference conditions.
Flexible Development and Control：It supports one - wire serial port control and can customize various protocols according to needs. It has hardware IIC and UART interfaces, enabling customization of various functions for customers. The chip also has the ability to be reprogrammed, eliminating concerns about batch issues caused by incomplete testing.

Entry Content of Reverse Horn Voice Chip (Platform - Customizable)：

Basic Warning Category：
- "Attention, the vehicle is reversing. Please keep away!"
- "Reversing is dangerous. Do not approach!"
Stage - by - Stage Prompting Category：
- At the start of reversing: "Reversing starts. Please pay attention to safety, people around!"
- When approaching an obstacle: "There is an obstacle ahead. Be careful while reversing!"
Multi - language Prompting Category：
- Chinese: "There is a pedestrian behind the vehicle. Reversing stopped!"
- English: "Pedestrian detected, reversing stopped!"
- Other languages: According to the needs of the usage area, voice prompts in languages such as Spanish and Arabic can be added to meet the requirements of international scenarios.
Brand - Customized Category：Enterprises can add brand - exclusive voices, such as "The vehicle of XX company is reversing. Please pay attention to safety!", which not only ensures safety but also strengthens brand promotion.

The KT148A voice chip has brought intelligent and human - centered upgrades to reverse horns. Through clear and diverse voice prompts, it effectively improves the safety and communication efficiency of reversing operations. It is widely applicable to various fields such as consumer electronics, automotive and transportation, industrial and safety equipment, healthcare and accessibility, home appliances and utilities, retail and public services, agriculture and environment monitoring. In the current context where industrial safety and transportation safety are highly valued, reverse horns equipped with the KT148A chip will surely become a standard safety device for various vehicles and mechanical equipment, building a solid defense line for personnel and property safety. In the future, Qingyue Electronics will also continue to optimize the performance of the KT148A chip, explore more applications of voice - interaction technologies in the field of safety warnings, and promote the continuous improvement of the industry's safety level.

Product details, product information, and sample acquisition and ordering links:
KT148A: More

The Mystery Behind JL (JieLi) Audio Bluetooth Chips for 9.9 - Yuan Wireless Bluetooth Earbuds with Free Shipping

Junluan Tsui — Sun, 20 Jul 2025 10:16:30 +0000

Title: The Mystery Behind JL (JieLi) Audio Bluetooth Chips for 9.9 - Yuan Wireless Bluetooth Earbuds with Free Shipping

Can you believe that there are 9.9 - yuan wireless Bluetooth earbuds with free shipping? Regardless of the quality and sound quality of these earbuds, the fact that they can achieve normal operation of functions such as Bluetooth wireless connection and pairing, earbud audio playback via Bluetooth, and charging case charging at such a low price is undoubtedly an ultimate manifestation of cost - effectiveness and a miracle of Made in China. Now, let's explore the core of these earbuds - JL (JieLi) Audio Bluetooth Chips, and find out what advantages they rely on to help Bluetooth earbud manufacturers achieve this.

High - integration Design：JL (JieLi) Bluetooth chips adopt a highly integrated design, integrating multiple functional modules into a single chip. Some chips have a rich built - in driver library, allowing developers to achieve functions like Bluetooth connection and audio codec without adding a large number of additional chips or modules, significantly reducing the overall hardware cost.
Self - developed IP Core and Local Supply Chain Cooperation：
- Self - developed IP Core：By developing its own IP core, JL (JieLi) reduces its dependence on external intellectual property, thus lowering the intellectual property licensing fees.
- Local Supply Chain Cooperation：Collaborating closely with local supply chains such as SMIC, JL (JieLi) takes advantage of the cost - advantage of the local supply chain to compress the chip cost to 60% of that of international giants, laying a solid foundation for low - cost Bluetooth earbud solutions.
Mature Production Process：
- Advanced Process：Some chips adopt a mature production process. For example, the KT6368A Bluetooth chip is based on a 40 - nanometer process and 12 - inch wafers, which not only improves performance but also effectively controls costs.
- Optimized Packaging：The adoption of SOP8 packaging further reduces the development and production costs for customers.
Cost Reduction through Mass Production：As of 2023, the cumulative sales of JL (JieLi) Bluetooth audio chips have exceeded 10 billion pieces, with a high market share. Mass production has significantly reduced the unit production cost. As fixed costs are allocated to more products, the cost per chip decreases, creating price space for low - priced Bluetooth earbuds.
Rapid Chip Iteration：JL (JieLi) shortens the chip iteration cycle to once every six months. By continuously launching chips with better performance and lower costs, it continuously optimizes product solutions. Each iteration has local breakthroughs, enabling better cost control while improving chip performance to meet the market demand for low - priced products.
Simplified Development Process：
- Abundant Development Tools：JL (JieLi) chips provide a wealth of development tools and development environments, with built - in hardware accelerators that improve the chip's computing efficiency and data processing speed, reducing the system cost.
- Shorter Development Cycle：Developers can carry out product development more conveniently and quickly, shortening the product launch time and reducing development costs, which indirectly reduces the cost of Bluetooth earbuds using JL (JieLi) chips.

The ability to produce Bluetooth earbuds with normal functions at such a price is already an ultimate display of cost - effectiveness and a miracle of Made in China.

Product details, product information, and sample acquisition and ordering links:
KT6368A: Product details

🚀 Fresh Batch of KT1026A & BT401 Modules – Ready to Rock!

Junluan Tsui — Sun, 20 Jul 2025 07:55:24 +0000

🚀 Fresh Batch of KT1026A & BT401 Modules – Ready to Rock!

Just shipped another batch of KT1026A chips and BT401 Bluetooth modules – all precision-programmed with automated QFN32 burning to ensure top-tier performance. 🔥

✅ Consistent quality
✅ Fully tested
✅ Ready for your next IoT/embedded project

Perfect for Bluetooth audio, wearables, or industrial automation. Drop a comment if you’ve used these before – or tag a dev who needs reliable hardware!

KT6368A Bluetooth Module - An Efficient Bridge for Data Interoperability in Electronic Medicine Boxes

Junluan Tsui — Sat, 19 Jul 2025 18:27:49 +0000

KT6368A Bluetooth Module - An Efficient Bridge for Data Interoperability in Electronic Medicine Boxes

Key Features of the Core Chip: Dual Benefits of Low Power Consumption and High Compatibility

The KT6368A is a Bluetooth 5.1 chip supporting both SPP + BLE dual-mode, offering stable wireless connectivity to electronic medicine boxes with its SOP8 packaging (pin pitch 1.27mm) and lightweight design.

Key specifications include:

Flexible Dual Mode Switching: Supports both BLE (Low Energy) and SPP (Classic Bluetooth), switchable via AT commands (B4/B5). This allows compatibility with different devices, such as mobile apps using BLE and medical terminals utilizing SPP.
Optimized for Low Power Consumption: The standard KT6368A consumes around 6mA in connection state; the low-power version KT6328A (BLE only) has an average broadcasting current of just 100uA at a broadcast interval of 1000ms, significantly extending battery life.
Stable Communication Performance: With a 24M crystal oscillator (load capacitance 12pF, frequency deviation ≤±10ppm), it ensures RF stability, covering communication distances up to 15 meters, and supports adjusting RF power through AT+BR command (levels 0-9) to fit various environments.

Critical Applications in Electronic Medicine Boxes

Real-time Medication Data Synchronization: After establishing a BLE connection with a mobile app, the medicine box can upload medication records (time, dosage) to the app via UUID "FFF1" characteristics, supporting single packet data transmission of 1024 bytes. MTU negotiation enables bulk file transfers, e.g., historical records synchronization.

Remote Control and Status Query: Users can remotely operate the device via the app:
- Send “AT+BM” to change the Bluetooth name (e.g., “Grandma’s Medicine Box”)
- Adjust broadcast intervals by sending “AT+UT” (balancing between power consumption and connection speed)
- Receive status feedback from the medicine box through “FFF2” characteristics (e.g., “20% Remaining Medication”)
Security and Compatibility Design: Password protection via AT+BE command (4-digit numeric password) prevents unauthorized access in SPP mode. The MAC address embedded in advertising packets solves iOS's inability to directly obtain MAC addresses, facilitating unique device identification.

Advantages in Development and Mass Production

Simplified AT Command Set: Supports quick configuration for common functionalities (e.g., setting baud rate to 115200 with “AT+CT05”, resetting to factory defaults with “AT+CW”), eliminating complex protocol development.
Hardware Design Reference: External antenna wiring is sufficient (length should match PCB layout); recommended crystal oscillators include 3225 package (cost-effective) or M49 (high stability), requiring no additional matching capacitors.
Mass Production Support: Provides Bluetooth test equipment for frequency offset detection (qualified range ±20KHz) and supports tape-and-reel packaging (1000 pieces per reel), suitable for SMT production lines.

Learn more about KT6368A here.

JL(JieLi) Bluetooth TEST Box Dial Switch Function Description

Junluan Tsui — Fri, 18 Jul 2025 14:25:51 +0000

Dial Switch Function Description

Default Advanced Audio Testing

Call Testing

When enabled, the test box connects to the prototype phone's audio, allowing call testing to be performed.
Call Microphone Loopback Testing

When enabled, speaking into the prototype's microphone sends audio to the test box, which then relays it back to the prototype, and the prototype's speaker plays the audio.
- ON: The microphone sound is output from the prototype's speaker.
- OFF: The microphone sound is output from the test box's speaker.
Quick Testing

When enabled, upon connecting to the prototype, the test box triggers the prototype to enter quick test mode. In this mode, the prototype activates its speakerphone function. Speaking into the prototype's microphone results in the sound being played through the speaker. Pressing a key on the prototype plays a key tone. Note: This feature requires the prototype to be on ac690x_sdk2011 or higher. Users must add an indicator light to the prototype to signal entry into this mode, depending on the prototype's configuration.
Frequency Offset Testing

When enabled, connecting to the prototype initiates frequency offset testing.
Automatic Frequency Offset Correction

When enabled, automatic correction is performed during the frequency offset testing process.