How to Use HX710B Air Pressure Sensor: Examples, Pinouts, and Specs

The HX710B is a high-precision air pressure sensor manufactured by AVIA Semiconductor. It is designed to measure atmospheric pressure with exceptional accuracy, making it suitable for a wide range of applications. The sensor is commonly used in weather monitoring systems, altitude measurement devices, and environmental sensing applications. Its compact design and digital output make it easy to integrate with microcontrollers and other electronic systems for data logging and analysis.

The HX710B is a versatile sensor with the following key technical details:

The HX710B has a simple pinout, as shown in the table below:

1. Power Supply: Connect the VDD pin to a stable power source (2.6V to 5.5V) and the GND pin to the ground of your circuit.
2. Data Communication: Use the DOUT pin to read the 24-bit pressure data. The SCK pin is used to provide the clock signal for serial communication.
3. Microcontroller Interface: The HX710B can be easily interfaced with microcontrollers like the Arduino UNO. The microcontroller reads the pressure data from the DOUT pin by providing clock pulses on the SCK pin.

• Power Stability: Ensure a stable power supply to avoid fluctuations in pressure readings.
• Clock Signal: The SCK pin requires a clean and consistent clock signal for accurate data communication.
• Temperature Effects: While the HX710B operates over a wide temperature range, extreme temperatures may slightly affect accuracy.
• Data Conversion: The 24-bit digital output needs to be processed by the microcontroller to convert it into meaningful pressure values (e.g., hPa).

Below is an example of how to interface the HX710B with an Arduino UNO to read pressure data:

// HX710B Air Pressure Sensor Example Code
// Connect HX710B pins: VDD to 5V, GND to GND, DOUT to pin 8, SCK to pin 9

#define DOUT_PIN 8  // Data output pin from HX710B
#define SCK_PIN 9   // Clock pin for HX710B

void setup() {
  pinMode(DOUT_PIN, INPUT);  // Set DOUT as input
  pinMode(SCK_PIN, OUTPUT); // Set SCK as output
  Serial.begin(9600);       // Initialize serial communication
}

long readPressure() {
  long data = 0;  // Variable to store pressure data
  while (digitalRead(DOUT_PIN) == HIGH); // Wait for DOUT to go LOW

  for (int i = 0; i < 24; i++) {
    digitalWrite(SCK_PIN, HIGH); // Generate clock pulse
    data = (data << 1) | digitalRead(DOUT_PIN); // Read data bit
    digitalWrite(SCK_PIN, LOW);  // End clock pulse
  }

  // HX710B sends 24-bit data; shift to align with signed 32-bit integer
  data = data ^ 0x800000; // Convert to signed value
  return data;
}

void loop() {
  long pressure = readPressure(); // Read pressure data
  Serial.print("Pressure Data: ");
  Serial.println(pressure); // Print raw pressure data
  delay(1000); // Wait 1 second before next reading
}

1. No Data Output:

   • Cause: Incorrect wiring or loose connections.
   • Solution: Double-check all connections, especially the DOUT and SCK pins.

2. Inconsistent Readings:

   • Cause: Unstable power supply or noisy clock signal.
   • Solution: Use a decoupling capacitor near the VDD pin and ensure a clean clock signal.

3. Incorrect Pressure Values:

   • Cause: Improper data conversion or incorrect bit alignment.
   • Solution: Verify the data processing logic in your microcontroller code.

• Q: Can the HX710B measure altitude?

  • A: Yes, the HX710B can be used for altitude measurement by converting pressure readings into altitude using standard atmospheric equations.

• Q: Is the HX710B waterproof?

  • A: No, the HX710B is not waterproof. It should be protected from moisture in outdoor applications.

• Q: What is the maximum cable length for connecting the HX710B?

  • A: The maximum cable length depends on the quality of the cable and the environment. For best results, keep the cable length under 1 meter to minimize signal degradation.

This concludes the documentation for the HX710B Air Pressure Sensor.