On 02/05/2026 11:16, Ralph Corderoy wrote:
An alternative method, if you end up re-working this section:deadline = time.time() + sensor_test_time_out while time.time() < deadline: if GPIO.input(sensor_b): break time.sleep(sensor_pause_time) Removes one variable, and it copes with creep though will still run past deadline on the final iteration. If the loop should execute at least once, then there's the explicit: deadline = time.time() + sensor_test_time_out while True: if GPIO.input(sensor_b): break if time.time() >= deadline: break time.sleep(sensor_pause_time)
Thanks for that, I'll keep that in mind.
It may be worth checking the code, or at least a fragment of it with the GPIO logic, away from the main hardware so you can manually alter the GPIO pin's value to debug the logic.
That's exactly what I am currently doing. However, when I created the most recent version of the code (about a year ago), it seems that I wrote it to a much larger SD Card (I probably only had a 32 GB card to hand at the time. As a result the image won't fit on the 8 GB cards I now have. To add to my woes, the previous version to that will fit on 8 GB, but was written using a read-only file system. I abandoned that last year, because it made debugging almost impossible.
I think I'll have to rebuild the whole system using the most recent RPi OS and write it all to a new card. That won't hurt and I can't do much more until next week anyway.
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