This is the third (an extremely short) post concerning my use of a Raspberry Pi 5, this time trying out some very simple physical programming; blinking four LEDs in quick sucession. Note that this is based on the setup performed in the prior two posts. The very basic schematic at the top of this post illustrates four individual LEDs connected to four different GPIO pins on the Raspberry Pi 5 GPIO connector. Using gpiozero with Python 3 (3.11.6 as of the date of this post) and the following script, I illuminate four individual LEDs in quick succession, then sleep two seconds before starting again.

#!/usr/bin/env pythonfrom gpiozero import LEDfrom time import sleepled1 = LED(22)led2 = LED(23)led3 = LED(24)led4 = LED(25)while True:led1.on()sleep(.05)led1.off()sleep(.05)led2.on()sleep(.05)led2.off()sleep(.05)led3.on()sleep(.05)led3.off()sleep(.05)led4.on()sleep(.05)led4.off()sleep(2)

The code is uniquely simple in that all I have to do is assign four LEDs to four pins, and then I can turn each one on and off.

I chose the specific GPIO pins for this example in part because they’re physically close together on the connector, and because internally they’re also logically close together (i.e. GPIO22 to GPIO25, in succession).

I’m also back on the KiCad train for good, finally, so that I won’t have to waste time remembering/relearning basic abilities to create schematics for what I physically design. I hope my drawings become clearer fairly quickly.