I try to port my GPIO project from quick2wire to WiringPi. My aim is to read the state of a photocell connected to pin 24 of my raspberry pi (model B, revision 2).
My code (python 3) looks like this:
import wiringpi2 as wiringpi import time wiringpi.wiringPiSetupSys() # wiringpi.wiringPiSetupGpio() # it would work with this instead of wiringPiSetupSys() counter = 0 status = "unknown" while True: counter += 1 light = wiringpi.digitalRead(24) if not light: status = "ON" else: status = "OFF" time.sleep(3) print('(' + str(counter) + ') ' + status)
wiringpi.wiringPiSetupGpio() instead of
wiringpi.wiringPiSetupSys() the code works as expected. Using
wiringpi.wiringPiSetupSys() however the output doesn't change - it would stay
OFF no matter how the state of the photo cell changes.
I also made sure that the pin is exported
$ gpio exports GPIO Pins exported: 5: in 0 none
As I checked the state of the photocell with
gpio gpio -g read 24 in the shell, I can exclude the possibility of a hardware issue.
As I want to use the code in a web application, I would strongly prefer to use
wiringPiSetupSys() as a non-root user.
Can you help me solve or analyze the cause of this issue?