Raspberry Pi GPIO Programming — Motion Sensor Camera with Python and Cloud Upload

# gpio_basics.py — basic GPIO input/output
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)  # Use Broadcom pin numbering

# Setup pins
LED_PIN = 18
GPIO.setup(LED_PIN, GPIO.OUT)

# Blink LED
for _ in range(5):
    GPIO.output(LED_PIN, GPIO.HIGH)
    print("LED ON")
    time.sleep(0.5)
    GPIO.output(LED_PIN, GPIO.LOW)
    print("LED OFF")
    time.sleep(0.5)

GPIO.cleanup()

# motion_camera.py — detect motion, capture photo, upload
import RPi.GPIO as GPIO
import time
import subprocess
import requests
from datetime import datetime

# Configuration
PIR_PIN = 17
LED_PIN = 18
UPLOAD_URL = "https://api.example.com/upload"
API_KEY = "your-api-key"

GPIO.setmode(GPIO.BCM)
GPIO.setup(PIR_PIN, GPIO.IN)
GPIO.setup(LED_PIN, GPIO.OUT)

def capture_photo():
    """Capture image with Raspberry Pi camera"""
    filename = f"motion_{datetime.now().strftime('%Y%m%d_%H%M%S')}.jpg"
    subprocess.run([
        "libcamera-still", "-o", filename,
        "--width", 1280, "--height", 720,
        "--nopreview"
    ])
    print(f"Photo captured: {filename}")
    return filename

def upload_to_cloud(filename: str):
    """Upload image to cloud storage"""
    try:
        with open(filename, 'rb') as f:
            response = requests.post(
                UPLOAD_URL,
                files={'file': f},
                headers={'Authorization': f'Bearer {API_KEY}'}
            )
        if response.status_code == 200:
            print(f"Uploaded: {response.json().get('url', 'unknown')}")
        else:
            print(f"Upload failed: {response.status_code}")
    except Exception as e:
        print(f"Upload error: {e}")

def alert():
    """Flash LED to indicate motion detected"""
    for _ in range(3):
        GPIO.output(LED_PIN, GPIO.HIGH)
        time.sleep(0.1)
        GPIO.output(LED_PIN, GPIO.LOW)
        time.sleep(0.1)

print("Motion detection started. Ctrl+C to exit.")
print("Waiting for motion...")

try:
    while True:
        if GPIO.input(PIR_PIN) == GPIO.HIGH:
            print(f"Motion detected at {datetime.now()}")
            alert()
            filename = capture_photo()
            upload_to_cloud(filename)
            print("Waiting 10 seconds before next detection...")
            time.sleep(10)  # Cooldown to prevent rapid triggers
        time.sleep(0.1)

except KeyboardInterrupt:
    print("\nStopped by user")
finally:
    GPIO.cleanup()

# multi_sensor.py — read temperature, humidity, and light
import RPi.GPIO as GPIO
import time
import Adafruit_DHT  # DHT sensor library

DHT_PIN = 4

def read_dht22():
    humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.DHT22, DHT_PIN)
    return temperature, humidity

def read_ldr(adc_channel: int = 0):
    """Read light level from LDR through MCP3008 ADC"""
    # Using MCP3008 SPI ADC
    import spidev
    spi = spidev.SpiDev()
    spi.open(0, 0)
    spi.max_speed_hz = 1350000
    r = spi.xfer2([1, (8 + adc_channel) << 4, 0])
    value = ((r[1] & 3) << 8) + r[2]
    spi.close()
    return value

while True:
    temp, hum = read_dht22()
    light = read_ldr()
    print(f"Temp: {temp:.1f}°C, Humidity: {hum:.1f}%, Light: {light}")
    time.sleep(5)

import RPi.GPIO as GPIO
import time
from datetime import datetime

MAGNETIC_SWITCH_PIN = 17  # Door sensor
BUZZER_PIN = 18           # Piezo buzzer
ARM_STATUS_PIN = 27       # LED shows armed status

GPIO.setmode(GPIO.BCM)
GPIO.setup(MAGNETIC_SWITCH_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(BUZZER_PIN, GPIO.OUT)
GPIO.setup(ARM_STATUS_PIN, GPIO.OUT)

armed = True
GPIO.output(ARM_STATUS_PIN, GPIO.HIGH)
print("System ARMED")

def door_callback(channel):
    if GPIO.input(MAGNETIC_SWITCH_PIN) == GPIO.HIGH:
        print(f"INTRUSION DETECTED at {datetime.now()}")
        for _ in range(10):
            GPIO.output(BUZZER_PIN, GPIO.HIGH)
            time.sleep(0.1)
            GPIO.output(BUZZER_PIN, GPIO.LOW)
            time.sleep(0.1)

GPIO.add_event_detect(MAGNETIC_SWITCH_PIN, GPIO.BOTH,
                      callback=door_callback, bouncetime=300)

try:
    while True:
        door_status = "OPEN" if GPIO.input(MAGNETIC_SWITCH_PIN) else "CLOSED"
        print(f"Door: {door_status}", end='\r')
        time.sleep(0.5)
except KeyboardInterrupt:
    GPIO.cleanup()