How to Use BD Sensor Board: Examples, Pinouts, and Specs

The BD Sensor Board is a versatile circuit board that integrates various sensors to detect and measure physical properties such as temperature, pressure, humidity, and motion. This board is commonly used in applications requiring environmental monitoring and data collection. Its compact design and ease of integration make it suitable for a wide range of projects, from home automation systems to industrial monitoring solutions.

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power supply and the GND pin to the ground.
2. Communication Interface: Choose between I2C or SPI for communication.
   • For I2C, connect the SDA and SCL pins to the corresponding pins on your microcontroller.
   • For SPI, connect the MISO, MOSI, SCK, and CS pins to the corresponding pins on your microcontroller.
3. Sensor Readings: Use the analog output (A0) for temperature readings and the interrupt pin (INT) for motion detection alerts.

• Power Supply: Ensure that the power supply voltage matches the operating voltage range of the BD Sensor Board.
• Pull-up Resistors: When using I2C communication, make sure to use appropriate pull-up resistors on the SDA and SCL lines.
• Noise Reduction: Place decoupling capacitors close to the power supply pins to reduce noise and improve stability.
• Sensor Placement: Position the board in a location where it can accurately measure the desired environmental parameters without interference.

#include <Wire.h>  // Include Wire library for I2C communication

#define TEMP_SENSOR_ADDR 0x48  // I2C address for temperature sensor
#define MOTION_SENSOR_PIN 2    // Digital pin for motion sensor interrupt

void setup() {
  Serial.begin(9600);  // Initialize serial communication at 9600 baud rate
  Wire.begin();        // Initialize I2C communication
  pinMode(MOTION_SENSOR_PIN, INPUT);  // Set motion sensor pin as input
  attachInterrupt(digitalPinToInterrupt(MOTION_SENSOR_PIN), motionDetected, RISING);
  // Attach interrupt to motion sensor pin, trigger on rising edge
}

void loop() {
  float temperature = readTemperature();  // Read temperature from sensor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");
  delay(1000);  // Wait for 1 second before next reading
}

float readTemperature() {
  Wire.beginTransmission(TEMP_SENSOR_ADDR);  // Start I2C transmission
  Wire.write(0x00);  // Send command to read temperature
  Wire.endTransmission();  // End I2C transmission
  Wire.requestFrom(TEMP_SENSOR_ADDR, 2);  // Request 2 bytes from sensor
  if (Wire.available() == 2) {
    int temp = Wire.read() << 8 | Wire.read();  // Read temperature data
    return temp * 0.0625;  // Convert to Celsius
  }
  return 0.0;  // Return 0.0 if no data available
}

void motionDetected() {
  Serial.println("Motion detected!");  // Print message when motion is detected
}

1. No Sensor Readings: Ensure that the power supply is connected correctly and that the communication lines (I2C or SPI) are properly connected.
2. Incorrect Temperature Readings: Verify that the sensor is not placed near heat sources or in direct sunlight, which can affect accuracy.
3. Motion Detection Not Working: Check the interrupt pin connection and ensure that the motion sensor is within its detection range.

• Check Connections: Double-check all connections to ensure they are secure and correctly placed.
• Use Serial Monitor: Utilize the Serial Monitor in the Arduino IDE to debug and verify sensor readings.
• Update Libraries: Ensure that you are using the latest versions of the required libraries (e.g., Wire library for I2C communication).

By following this documentation, users can effectively integrate and utilize the BD Sensor Board in their projects, ensuring accurate environmental monitoring and data collection.