Quick Guide: Industrial Pressure Monitoring with Arduino and XMLP010BD21F

#webdev

Hey devs! Ever needed reliable pressure sensing for your DIY IoT rig—think hydroponics, air compressors, or hydraulic prototypes—but didn't want to skimp on accuracy? Enter the XMLP010BD21F from Schneider Electric's Telemecanique line: a tough 0-10 bar transmitter pumping out a clean 4-20mA signal. It's IP67-rated, handles nasty fluids like oil or gas, and costs under $100. Let's wire it up to an Arduino for real-time reads. Super quick build!


![ ](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/r9p3u73mb9b6vc3lb0e3.png)

Why XMLP010BD21F?

Precision: ±0.5% accuracy over 10 bar.
Rugged: Vibration-proof (20g), shock-resistant (100g), -30°C to 135°C temps.
Simple: 2-wire current loop—no fuss with voltage swings.
Beats hobby sensors for industrial vibes without breaking the bank.

What You'll Need

Arduino Uno
XMLP010BD21F sensor
12-24V DC power supply (e.g., wall wart)
250Ω 1% resistor (for 1-5V conversion)
Jumper wires and breadboard
Optional: M12 cable (XZCC12FDM40B)

Step 1: Wiring It Up
Power the sensor externally—Arduino can't supply the juice. Use the M12 connector: Pin 1 (+ supply), Pin 3 (signal/return).

Connect 12-24V+ to sensor Pin 1.
Sensor Pin 3 to one end of 250Ω resistor.
Other resistor end to Arduino A0 and GND.
Sensor Pin 3 also to GND (complete the loop).
Arduino GND to power supply GND.

Boom—pressure twists the signal from 4mA (0 bar) to 20mA (10 bar), dropping 1-5V across the resistor for easy analog reads.
(Sketch it in Fritzing: Sensor → Resistor → A0.)
Step 2: Code Snippet
Grab the Arduino IDE, no libs needed. This reads voltage, converts to pressure, and spits to Serial.

const int pressurePin = A0;
const float R_SHUNT = 250.0;  // Ohms
const float V_SUPPLY = 5.0;   // Arduino ref
const float P_MAX = 10.0;     // bar

void setup() {
  Serial.begin(9600);
}

void loop() {
  int raw = analogRead(pressurePin);
  float voltage = (raw * V_SUPPLY) / 1023.0;
  float current = voltage / R_SHUNT * 1000.0;  // mA
  float pressure = (current - 4.0) / 16.0 * P_MAX;  // bar

  Serial.print("Pressure: ");
  Serial.print(pressure, 2);
  Serial.println(" bar");

  delay(1000);
}

Quick Math Breakdown:

Voltage → Current (Ohm's law).
Current → Pressure (linear 4-20mA scale).
Tune for your setup—response time's <2ms!

Upload, open Serial Monitor: "Pressure: 2.34 bar" on a gentle squeeze.
Level It Up

Alerts: Add if(pressure > 8) for buzzer warnings.
Logging: SD card timestamps via RTC.
Wireless: ESP32 + MQTT to dashboard it.
Pro Tip: Calibrate with a known pressure source.

This beast turns your Arduino into a mini SCADA node. What's your pressure project? Share in comments—let's hack!

DEV Community

Quick Guide: Industrial Pressure Monitoring with Arduino and XMLP010BD21F

Top comments (0)