waiting for GPIO button press eating resources

[uilfut]

Hey guys

Running my script to wait for a GPIO button press (which prints some stats on al oled screen) takes my processor from 2% to 25%.

As soon as I press the button it goes down to 2% from 25% for 10 seconds while stats are displayed).

I have a simple while loop:

Code: Select all

while True:
    if GPIO.input(15):
        display_on_oled()

Can I do anything to make it use less resources?

Many thanks

Will

[B.Goode]

I have no idea if it would use less CPU, but the gpiozero python library module has a Button class that implements a wait_for_press() method. (A timeout can be specified.)

Worth a comparison?

[mattmiller]

Can I do anything to make it use less resources?

stick a small time.sleep() in the loop

Your loop is running around in a very small circle very fast wearing itself out

[uilfut]

(Thanks both for suggestions!)

Can I do anything to make it use less resources?

stick a small time.sleep() in the loop

Yes I thought of this - but if I had, say a time.sleep(2), would I have to hold the button down for up to 2 seconds before it registered?

Sorry if this is basic misunderstanding...

[uilfut]

(Thanks both for suggestions!)

Can I do anything to make it use less resources?

stick a small time.sleep() in the loop

Yes I thought of this - but if I had, say a time.sleep(2), would I have to hold the button down for up to 2 seconds before it registered?

This fixed it, thank you... I just hold the button down until the screen comes on.

I wonder how small I can make the sleep interval....

[rpiMike]

time.sleep(0.1) should work fine