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

The Blood Pressure Sensor (Manufacturer: Sunrom, Part ID: 1437) is a device designed to measure the pressure of blood in the arteries. It is commonly used in medical and health monitoring applications to assess cardiovascular health. This sensor provides an analog output proportional to the blood pressure, making it suitable for integration into microcontroller-based systems for real-time monitoring and data logging.

• Medical devices for blood pressure monitoring
• Wearable health monitoring systems
• Research and development in biomedical engineering
• Home healthcare devices
• IoT-based health monitoring solutions

The following table outlines the key technical details of the Sunrom 1437 Blood Pressure Sensor:

The Sunrom 1437 Blood Pressure Sensor has a 3-pin interface. The pin configuration is as follows:

1. Power the Sensor: Connect the VCC pin to a 5V DC power supply and the GND pin to the ground of your circuit.
2. Read the Output: Connect the OUT pin to an analog input pin of a microcontroller (e.g., Arduino UNO) to read the sensor's output voltage.
3. Calibrate the Sensor: Use a known reference to calibrate the sensor for accurate blood pressure readings. The output voltage corresponds to the measured pressure in mmHg.
4. Process the Data: Use the microcontroller to convert the analog signal into meaningful blood pressure values using the sensor's specifications.

• Ensure the sensor is powered with a stable 5V DC supply to avoid inaccurate readings.
• Avoid exposing the sensor to temperatures outside the operating range (10°C to 50°C).
• Use proper shielding and grounding to minimize noise in the analog output signal.
• Regularly calibrate the sensor to maintain accuracy over time.
• Handle the sensor carefully to avoid physical damage to the sensitive components.

Below is an example code snippet to interface the Sunrom 1437 Blood Pressure Sensor with an Arduino UNO:

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

// Variable to store the sensor's analog output
int sensorValue = 0;

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

void loop() {
  // Read the analog value from the sensor
  sensorValue = analogRead(sensorPin);

  // Convert the analog value (0-1023) to voltage (0-5V)
  float voltage = sensorValue * (5.0 / 1023.0);

  // Convert the voltage to blood pressure in mmHg
  // Assuming a linear relationship: 0V = 0 mmHg, 5V = 300 mmHg
  float bloodPressure = (voltage / 5.0) * 300.0;

  // Print the blood pressure value to the Serial Monitor
  Serial.print("Blood Pressure: ");
  Serial.print(bloodPressure);
  Serial.println(" mmHg");

  // Wait for 1 second before the next reading
  delay(1000);
}

1. No Output Signal:

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Verify the connections and ensure the sensor is powered with 5V DC.

2. Inaccurate Readings:

   • Cause: Sensor not calibrated or exposed to electrical noise.
   • Solution: Calibrate the sensor using a known reference and ensure proper grounding.

3. Fluctuating Output:

   • Cause: Unstable power supply or environmental interference.
   • Solution: Use a regulated power supply and minimize external noise sources.

4. Sensor Not Responding:

   • Cause: Operating outside the specified temperature range.
   • Solution: Ensure the sensor is used within the 10°C to 50°C range.

• Double-check all connections and ensure the sensor is properly interfaced with the microcontroller.
• Use a multimeter to measure the output voltage directly from the sensor to verify its functionality.
• If the sensor is not working as expected, consult the manufacturer's datasheet for additional details and troubleshooting steps.

By following this documentation, users can effectively integrate the Sunrom 1437 Blood Pressure Sensor into their projects and achieve accurate blood pressure monitoring.