HX710B Air Pressure Sensor Datasheet, How to Connect

The HX710B Air Pressure Sensor Module monitors the air's pressure in the range of 0 to 40 kilopascals (kPa) and turns it into an electrical impulse which microcontrollers or other electrical gadgets can interpret and read.

It is a common and frequently utilized sensor in a wide range of applications that demand precise pressure sensing, including weather monitoring, industrial control systems, and medical equipment.

The HX710B device is a piezoresistive pressure sensor which determines pressure by detecting variations in electrical resistance produced by pressure-induced displacement of a sensing element.

The module is made up of a pressure sensing element, a signal conditioning circuit, and an output amplifier. The sensor chip is a tiny, thin-film device having a diaphragm and piezoresistive components.

The signal conditioning circuit boosts and purifies the electrical signal from the sensing element, and the output amplifier generates a voltage or current proportionate to the pressure detected by the sensor.

Technical Specifications

Here are some key specifications of the HX710B air pressure sensor:

• Operating pressure range: 30kPa to 110kPa
• Supply voltage: 1.8V to 5.5V
• Operating temperature range: -40°C to +125°C
• Sensitivity: 80mV/kPa
• Total error: ±2% FS
• Long-term stability: ±1% FS/year
• Response time: ≤ 1ms

Features of the HX710B Air Pressure Sensor Module

The HX710B sensor module offers several advantages that enable it to be a good option for a wide range of applications. These are some examples:

Broad pressure range: The module can detect pressure from 0 to 40kPa, making it appropriate for a broad range of low-pressure sensing applications.

High precision: The HX710B module offers a precision of 1% of full-scale pressure, ensuring dependable and accurate pressure readings.

Compact size: The module is modest in size and may simply be incorporated into different size and shape, which makes it ideal for projects that require little space.

Reduced energy consumption: The HX710B module consumes less power, which makes it perfect for battery-powered applications.

Simple to use: The module is simple to operate and can communicate with microcontrollers and other electronic equipment through conventional protocols, for example I2C or SPI.

Applications of the HX710B Air Pressure Sensor Module

The HX710B Air Pressure Sensor Module is utilised in a variety of applications where accurate and dependable pressure detection is required. The module is commonly used for the following purposes:

Environment monitoring: The module may be used to record air pressure and provide feedback on weather conditions including such variations in atmospheric pressure, that can contribute in weather pattern prediction.

The module can be utilized to measure pressure in diverse manufacturing systems, including such pneumatic and hydraulic ones, in order to verify that they are working under safe and appropriate pressure limits.

Healthcare devices: The device may be utilized to monitor the pressure of air or oxygen provided to patients who use medical instrumentation including respiratory machines.

Gas pressure measuring system: The module can be employed to monitor gas flow and diagnose leaks by measuring the pressure of gas in pipelines and other gas distribution networks.

Automotive: The module can be integrated into automobile applications including such tyre pressure monitoring equipment to detect air pressure in tyres and inform drivers if the pressure is not high enough.

How to Use the HX710B Air Pressure Sensor Module

The HX710B Air Pressure Sensor Module is simple to use. The steps below could serve as a reference:

Use conventional protocols such as I2C or SPI to attach the module to a microcontroller or other electric devices.

Connect the module to power and wait for it to stabilise.

To use a microcontroller or other electronic gadget, obtain the pressure value from the module's output.

To guarantee precise pressure measurement, calibrate the module if necessary.

How to use it in an Electronic Circuit

The HX710B Air Pressure Sensor Module is a pressure sensor which could be utilised in many different electrical applications. To interface it to an electronic circuit, you must first do the following steps:

Identify the power needs: The HX710B Air Pressure Sensor Module demands a 5V DC power source, therefore ensure your circuit can offer it.

Attach the power: Hookup the HX710B's VCC pin to the 5V power source, and the GND pin to ground.

Attach the signal output: Because the HX710B Air Pressure Sensor Module emits a digital voltage signal, you must connect it to a digital input pin on your microcontroller or other circuit.

Add a decoupling capacitor: To stabilise the power supply and decrease noise, connect a decoupling capacitor between the HX710B's VCC and GND pins. A 0.1uF capacitor is usually adequate.

How to connect it with Arduino

You can adhere to these procedures to connect an Arduino and the HX710B Air Pressure Sensor Module:

Attach the power supply by connecting the GND and VCC pins of the HX710B module to the Arduino board's GND and 5V pins, respectively.

Connect the signal output: Join an Arduino board's digital input pin to the HX710B module's OUT pin. Any of the board's digital input pins, as illustrated in the image below, can be used.

The HX710B module's VCC and GND pins should be connected to a 0.1uF decoupling capacitor, as was previously described, to stabilise the power supply.

Program Code

// Define pins for HX710B
const int dataPin = 2; // DOUT
const int clockPin = 3; // SCK

void setup() {
  pinMode(dataPin, INPUT);
  pinMode(clockPin, OUTPUT);
  Serial.begin(9600);
}

long readHX710B() {
  long result = 0;

  // Wait for the module to be ready
  while (digitalRead(dataPin) == HIGH);

  // Read 24-bit data
  for (int i = 0; i < 24; i++) {
    digitalWrite(clockPin, HIGH);
    result = (result << 1) | digitalRead(dataPin);
    digitalWrite(clockPin, LOW);
  }

  // Apply clock pulse to complete the conversion
  digitalWrite(clockPin, HIGH);
  delayMicroseconds(1);
  digitalWrite(clockPin, LOW);

  // Return the 24-bit result
  return result;
}

void loop() {
  long pressureValue = readHX710B();

  Serial.print("Pressure (raw value): ");
  Serial.println(pressureValue);

  // Add a delay
  delay(500);
}

Checking the Output

Once you have configured the above setup, you can check the output by checking the LED lamp of the Arduino board.

Each time an pressure is detected on the sensor, the LED can be seen illuminating at some threshold point of the air pressure.

Using Analogue Pins

The HX710B Air Pressure Sensor Module can be also connected with the analog pin of the Arduino board by programming the following code.

Here is an example code to read the analog output from the HX710B module and print it to the serial monitor:

// Assign the analog input pin
int pressurePin = A0;

void setup() {
  // Start the serial communication
  Serial.begin(9600);
}

void loop() {
  // Read the analog input value
  int pressureValue = analogRead(pressurePin);

  // Print the pressure value to the serial monitor
  Serial.print("Pressure: ");
  Serial.print(pressureValue);
  Serial.println(" Pa");

  // Add a delay to prevent rapid reading of the same value
  delay(500);
}

This code reads the analog input from the HX710B module and prints the pressure value in Pascal (Pa) to the serial monitor every 500 milliseconds.

Note that you may need to adjust the scale factor to convert the analog input value to a pressure value in your specific application, depending on the calibration of the HX710B module.

Conclusion

The HX710B Air Pressure Sensor Module is a flexible and dependable sensor with excellent accuracy, low power consumption, and simple integration into electronic systems.

It is appropriate for a number of applications because because of its extended pressure range and compact size, namely gas flow measurement in automobiles, industrial control systems, medical equipment, and industrial processes.

It's crucial to calibrate the HX710B module before use to guarantee precise pressure reading. Yet with the necessary calibration and configuration, the module can deliver accurate and repeatable pressure measurement for a range of applications.