🎉 Added script and README

README.md

@@ -1,2 +1,41 @@
-# rpi-nightlight
+# Raspberry Pi nightlight
 
+A simple Python script which turns your Raspberry Pi into a motion activated nightlight.
+
+## Installation
+
+You will need the following dependencies:
+
+```
+pip3 install RPi.GPIO rpi-ws281x
+```
+
+Clone this repo or just download the python script and put it into `/usr/local/bin` for example and make it executeable.
+
+```
+chmod +x /usr/local/bin/nightlight.py
+```
+
+
+Probably you want to start this script at boot, put this in `/etc/cron.d/nightlight`
+```
+@reboot root /usr/local/bin/nightlight.py > /dev/null 2>&1
+```
+
+## GPIO PINs
+
+Connect the PIR sensor as following (I have used a HC-SR501):
+
+```
+VCC: 5V
+DATA: GPIO 23
+GND: GND
+```
+
+Connect the Neopixel strip (some ws281x will do) as following:
+
+```
+VCC: 5V
+DATA: GPIO 18
+GND: GND
+```

nightlight.py

@@ -0,0 +1,67 @@
+#!/usr/bin/python
+import RPi.GPIO as GPIO
+import time
+from rpi_ws281x import PixelStrip, Color, Adafruit_NeoPixel
+
+SENSOR_PIN = 23
+LIGHT_SENSOR_PIN = 21
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(SENSOR_PIN, GPIO.IN)
+GPIO.setup(LIGHT_SENSOR_PIN, GPIO.IN)
+
+LED_COUNT = 15
+
+led_duration = 0
+
+strip = Adafruit_NeoPixel(LED_COUNT, 18, 800000, 5, False, 255)
+strip.begin()
+
+
+def turn_on_light(channel):
+    if GPIO.input(LIGHT_SENSOR_PIN):
+        # motion detected
+        # reset LED duration
+        global led_duration
+        led_duration = 0
+        colorWipe(strip, Color(255, 0, 32))
+    else:
+        # there was motion but it is not dark yet
+        colorWipe(strip, Color(0, 0, 0))
+
+
+def turn_off_light(channel):
+    # turn off light
+    colorWipe(strip, Color(0, 0, 0))
+
+
+def colorWipe(strip, color, wait_ms=100):
+    for i in range(strip.numPixels()):
+        strip.setPixelColor(i, color)
+        strip.show()
+        time.sleep(wait_ms / 1000.0)
+
+
+try:
+    GPIO.add_event_detect(
+        SENSOR_PIN, GPIO.RISING, callback=turn_on_light
+    )
+    GPIO.add_event_detect(
+        LIGHT_SENSOR_PIN, GPIO.RISING, callback=turn_off_light, bouncetime=500
+    )
+    while True:
+        if strip.getPixelColor(0) > 0:
+            # check if LED is on for more than X seconds
+            if led_duration > 180:
+                # turn off LED
+                colorWipe(strip, Color(0, 0, 0))
+                led_duration = 0
+            else:
+                led_duration += 1
+        else:
+            led_duration = 0
+        time.sleep(1)
+except KeyboardInterrupt:
+    colorWipe(strip, Color(0, 0, 0))
+    print("Exiting...")
+GPIO.cleanup()