So I tested by following the youtube video after connecting my photoresistor circuitry to GPIO18 (on pin 12).
I used a 6.8 uF capacitor and a series resistor of 215 ohm for discharge.
Connections:
- My photo resistor from pin 17 (3.3V) using a 215 ohm series resistor to pin 12 (GPIO18)
- Capacitor 6.8uF from photo resistor/resistor junction to pin 6 (GND)
Since I have never ever used Python I may have done something wrong here, but this is what I did:
1) fully updated my PiZero:2) Using nano I typed in the code shown in the video into photoResistorTest.py:3) Then I tried running the example:But nothing at all happened until I had to press Ctrl-C to break it...I noted in the code that it ends with a while loop, which seems not to be closed, so that may be a problem (no end for the while...)
But that is what was shown in the video.
Questions:
- resistorPin = 18, should this be the actual pin number (12) instead of the GPIO number (18)?
- How does one properly exit a while loop in Python?
I used a 6.8 uF capacitor and a series resistor of 215 ohm for discharge.
Connections:
- My photo resistor from pin 17 (3.3V) using a 215 ohm series resistor to pin 12 (GPIO18)
- Capacitor 6.8uF from photo resistor/resistor junction to pin 6 (GND)
Since I have never ever used Python I may have done something wrong here, but this is what I did:
1) fully updated my PiZero:
Code:
sudo apt updatesudo apt full-upgradesudo apt install python3-pipsudo pip3 install RPi.GPIOCode:
import RPi.GPIO as GPIOimport timeGPIO.setmode(GPIO.BOARD)resistorPin = 18while True: GPIO.setup(resistorPin, GPIO.OUT) GPIO.output(resistorPin, GPIO.LOW) time.sleep(0.1) GPIO.setup(resistorPin, GPIO.IN) currentTime = time.time() diff = 0 while(GPIO.input(resistorPin) == GPIO.LOW): diff = time.time() - currentTime print(diff * 1000) time.sleep(1)Code:
$ python photoResistorTest.pyCode:
^CTraceback (most recent call last): File "/home/pi/projects/photoresistor/photoResistorTest.py", line 18, in <module> diff = time.time() - currentTimeKeyboardInterruptBut that is what was shown in the video.
Questions:
- resistorPin = 18, should this be the actual pin number (12) instead of the GPIO number (18)?
- How does one properly exit a while loop in Python?
Statistics: Posted by Bosse_B — Tue Dec 03, 2024 8:14 am