HX710B Pressure Sensor Library

October 9, 2025 · View on GitHub

An Arduino library for interfacing with the MPS20N0040D pressure sensor using the HX710B ADC module. This library provides pressure measurements in multiple units with calibration features.

Features

Multi-unit Support: Pressure readings in Pascal, kPa, PSI, mmHg, and ATM
Advanced Calibration: Two-point linear calibration for improved accuracy
Robust Communication: Interrupt-safe SPI communication with timeout handling
Cross-platform: Compatible with Arduino, ESP32, ESP8266, and other platforms
Power Management: Built-in power down/wake up functionality
Ready Detection: Multiple methods for checking sensor readiness

Hardware Compatibility

Pressure Sensor: MPS20N0040D (0-40 kPa range)
ADC Module: HX710B
Microcontrollers: Arduino Uno/Nano, ESP32, ESP8266, Teensy, and more

Installation

Download this library as a ZIP file
In Arduino IDE: Sketch → Include Library → Add .ZIP Library
Select the downloaded ZIP file

Quick Start

Basic Usage

#include "HX710B.h"

const int DOUT_Pin = 2;   // Sensor data pin
const int SCLK_Pin = 3;   // Sensor clock pin

HX710B pressure_sensor;

void setup() {
  Serial.begin(57600);
  pressure_sensor.begin(DOUT_Pin, SCLK_Pin);
}

void loop() {
  if (pressure_sensor.is_ready()) {
    Serial.print("Pressure: ");
    Serial.print(pressure_sensor.kPaCal());  // Calibrated reading
    Serial.println(" kPa");
  }
  delay(1000);
}

Available Pressure Units

float pascals = pressure_sensor.pascal();    // Pascals (Pa)
float kilopascals = pressure_sensor.kPaCal(); // Kilopascals (kPa) - calibrated
float psi = pressure_sensor.psi();           // Pounds per square inch
float mmHg = pressure_sensor.mmHg();         // Millimeters of mercury
float atm = pressure_sensor.atm();           // Atmospheres