PIR Motion Sensor with STM32

This project demonstrates how to interface an HC-SR501 Pyroelectric PIR infrared motion sensor with an STM32 microcontroller to detect motion.

Introduction

The HC-SR501 PIR motion sensor detects temperature changes caused by movement and sends signals to the STM32. The microcontroller interprets these signals to determine if motion has occurred, triggering actions such as activating lights or sending notifications.

Hardware Components

STM32H743 Nucleo-144
HC-SR501 PIR Motion Sensor
LED
Jumper Wires

Setup

Connect the HC-SR501 PIR motion sensor to the STM32 using the specified pins.
Upload the provided Arduino code to the STM32.
Monitor the sensor output using the Arduino Serial Monitor.

Wiring

STM32 Pin	PIR Motion Sensor Pin
5V	VCC
GND	GND
D2	OUT

Arduino Code

#include <Arduino.h>

#define PIR_PIN PA1 

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Configure PIR pin as input
  pinMode(PIR_PIN, INPUT);
  
  // Configure LED pin as output
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // Read PIR sensor output
  int pirState = digitalRead(PIR_PIN);
  
  if (pirState == HIGH) {
    Serial.println("Motion Detected");
    digitalWrite(LED_BUILTIN, HIGH); // Turn on the LED
  } else {
    Serial.println("No Motion Detected");
    digitalWrite(LED_BUILTIN, LOW); // Turn off the LED
  }
  
  delay(1000); // Adjust delay as needed
}

Serial Monitor Output

Python Script

import serial
import pyttsx3
import time

ser = serial.Serial('COM10', 9600) 
engine = pyttsx3.init()

while True:
    data = ser.readline().decode().strip()
    print("Received data:", data)
    engine.say(data)
    engine.runAndWait()

Python Script Output

Schematics

Data Visualization

Applications

- Home Automation
- Security Systems
- Robotics
- Industrial Automation

Contributors

EVANS ACHEAMPONG – 10987644						
EDWARD AYIREBI ACQUAH - 10986982
AMOAH OFORI DARKWAH - 10949533 						
BANI BERES ETORNAM – 10948391
EYRAM AHETO - 10987509

Conclusion

Interfacing the HC-SR501 Pyroelectric PIR infrared motion sensor with an STM32 provides a cost-effective solution for motion detection in various projects.