Photoresistor
Hardware
| Raspberry Pi |
Photoresistor |
1 uf
|
| GPIO 4 |
PIN A |
|
| GND |
GND |
GND |
| +5V
|
|
+VCC |
Python
$ sudo nano photoresistor.py
DEBUG = 1 GPIO.setmode(GPIO.BCM) def RCtime (RCpin): reading = 0 GPIO.setup(RCpin, GPIO.OUT) GPIO.output(RCpin, GPIO.LOW) time.sleep(0.01) GPIO.setup(RCpin, GPIO.IN) # This takes about 1 millisecond per loop cycle while (GPIO.input(RCpin) == GPIO.LOW): reading += 1 return reading while True: print RCtime(4) # Read RC timing using pin #18
Test and Result
Test :
$ sudo python phtotresistor.py
Result :
1800
374
2507
403
398
502
1804
385
4373
390
369
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