How to Use Pressure Sensor Module: Examples, Pinouts, and Specs

The Pressure Sensor Module (DFROBOT SEN0372) is a versatile device designed to measure the pressure of gases or liquids and convert it into an electrical signal. This module is ideal for applications requiring precise pressure monitoring and control, such as weather stations, industrial automation, medical devices, and fluid dynamics systems.

The SEN0372 module is compact, reliable, and easy to integrate into various projects, making it suitable for both hobbyists and professionals. Its high sensitivity and accuracy ensure consistent performance in a wide range of environments.

Below are the key technical details of the DFRobot SEN0372 Pressure Sensor Module:

The SEN0372 module has a 3-pin interface for easy connection. Below is the pinout:

1. Power the Module: Connect the VCC pin to a 5V DC power source and the GND pin to the ground of your circuit.
2. Read the Output Signal: Connect the OUT pin to an analog input pin of a microcontroller (e.g., Arduino UNO) to read the voltage signal corresponding to the measured pressure.
3. Calibrate the Sensor: The output voltage ranges from 0.5V (minimum pressure) to 4.5V (maximum pressure). Use this range to map the voltage to the actual pressure value in your code.

• Power Supply: Ensure a stable 5V DC power supply to avoid fluctuations in the output signal.
• Environmental Conditions: Avoid exposing the sensor to extreme temperatures or corrosive substances, as this may affect its accuracy and lifespan.
• Signal Filtering: If the output signal is noisy, consider adding a capacitor (e.g., 0.1 µF) between the OUT pin and GND to filter high-frequency noise.
• Pressure Range: Do not exceed the specified pressure range (0 to 40 kPa) to prevent damage to the sensor.

Below is an example of how to interface the SEN0372 Pressure Sensor Module with an Arduino UNO:

// Define the analog pin connected to the sensor's OUT pin
const int pressurePin = A0;

// Variables to store sensor readings
float sensorVoltage = 0.0;
float pressure = 0.0;

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read the analog value from the sensor (0-1023)
  int sensorValue = analogRead(pressurePin);

  // Convert the analog value to voltage (0-5V)
  sensorVoltage = sensorValue * (5.0 / 1023.0);

  // Map the voltage to pressure (0.5V = 0 kPa, 4.5V = 40 kPa)
  pressure = (sensorVoltage - 0.5) * (40.0 / (4.5 - 0.5));

  // Print the pressure value to the Serial Monitor
  Serial.print("Pressure: ");
  Serial.print(pressure);
  Serial.println(" kPa");

  // Delay for a short period before the next reading
  delay(500);
}

• The analogRead() function reads the voltage from the sensor's OUT pin.
• The voltage is converted to pressure using the formula:
  Pressure = (Voltage - 0.5) * (40 / (4.5 - 0.5))
• The result is displayed in kilopascals (kPa) on the Serial Monitor.

1. No Output Signal:

   • Ensure the module is powered with a stable 5V DC supply.
   • Verify all connections are secure and correct.

2. Inaccurate Readings:

   • Check for noise in the output signal and add a capacitor if necessary.
   • Ensure the sensor is not exposed to temperatures or pressures outside its operating range.

3. Fluctuating Readings:

   • Use a stable power source to minimize voltage fluctuations.
   • Implement software filtering (e.g., averaging multiple readings) to smooth out noise.

Q: Can this sensor measure negative pressure?
A: No, the SEN0372 is designed to measure positive pressure only, within the range of 0 to 40 kPa.

Q: Is the sensor waterproof?
A: The sensor is not fully waterproof. Avoid direct exposure to liquids unless proper sealing is applied.

Q: Can I use this sensor with a 3.3V microcontroller?
A: The sensor requires a 5V power supply, but its output can be read by a 3.3V microcontroller if the analog input pin supports 5V-tolerant signals. Otherwise, use a voltage divider to step down the output signal.

By following this documentation, you can effectively integrate the DFRobot SEN0372 Pressure Sensor Module into your projects for accurate and reliable pressure measurements.