HX710B Analog Pressure Sensor Module

Description

HX710B Analog Pressure Sensor Module

The HX710B is a pressure-sensor module based on a 0–40 kPa piezoresistive sensor and a high-resolution analog-to-digital converter. It provides an output voltage proportional to the measured pressure and can be interfaced with a microcontroller to measure air pressure or liquid level through 2.5 mm tubing. Technical reference

Technical specifications

• Measurement range: 0–40 kPa
• Supply voltage: 3.3–5 V DC
• Output: analog, 0–VCC, proportional to pressure
• Accuracy: ±1.5% FS
• Response time: ≤ 1 ms
• Operating temperature: −40 °C to +85 °C
• Dimensions: 18 × 15 × 5 mm

Typical applications

• Atmospheric pressure measurement (weather station)
• Liquid-level monitoring (tanks and pumps)
• Leak and overpressure detection systems
• Industrial automation and pneumatic control
• DIY Arduino/ESP32 barometer or manometer projects

Arduino code example

This example reads the module output on analog input A0 and converts it to pressure. The calculation shown assumes a 5 V supply.

const int pressurePin = A0; // Broche analogique reliée à la sortie OUT du module
void setup() {
Serial.begin(9600);
}
void loop() {
int raw = analogRead(pressurePin);
// Conversion ADC → tension (si Vcc=5V)
float voltage = raw * (5.0 / 1023.0);
// Conversion tension → pression (0–40 kPa)
float pressure = (voltage / 5.0) * 40.0;
Serial.print("Pression : ");
Serial.print(pressure, 2);
Serial.println(" kPa");
delay(500);
}

Pinout

1. VCC → 5 V (or 3.3 V to match your supply).
2. GND → GND (common ground).
3. OUT → A0 to read the voltage proportional to pressure.

Note: Adjust the voltage-to-pressure conversion formula if powering the module at 3.3 V.