Autobrightness 7" Touchscreen based on Ambient Light

hengy

I found this posting and will try to install it this week. Just use google translate to translate from its native Turkish.

http://www.ilhanakilli.com.tr/sbc/raspberry-pi-7-dokunmatik-ekran-otomatik-parlaklik/

hengy

Well I’ve done the wiring. I think it’s correct. I’m wiring directly with the pins on the pi.
I get the error
sudo: unable to execute ./backlight.py: No such file or directory

Here’s the code. Any help would be appreciated.

import RPi.GPIO as GPIO
import time
In gpıo.setmo (GPIO.BOARD)
#ldr reading pisi identification
pin_to_ldr = 7
def rc_time (pin_to_ldr):
	count = 0
  
	#Output on the pin for 
	GPIO.setup (pin_to_ldr, GPIO.OUT)
	GPIO.output (pin_to_ldr, GPIO.LOW)
	time.sleep (0.01)

	#Change the pin back to input
	GPIO.setup (pin_to_ldr, GPIO.IN)
	#Count until the pin goes high
	while (GPIO.input (pin_to_ldr) == GPIO.LOW):
        	count + = 1

	return count

#Catch when script is interrupted, cleanup correctly
try:
	# Main loop
	while True:
		bl = open ('/ sys / class / backlight / rpi_backlight / brightness', 'w'
		read = 0
		read = rc_time (pin_to_ldr)
		if read

hengy

@hengy
Well it seems to be working. What was missing from the cut and paste I did of the code was

#! / Usr / local / bin / python

Seems /usr/local/bin/python doesn’t exist on my pi. I changed it to usr/bin/python. Also
okunan means read in Turkish. I changed it back to read. I ran this in a terminal and it seems to work. Nice, I now have a screen which changes to ambient light.