Sorry for the late reply, and thank you for sharing your insights!

When working with setups with two power supplies, it is important to ensure that they share the same GND potential. Without a common GND connection, the devices won't have a shared reference point for their voltages. This can cause voltage mismatches, leading to unpredictable behavior such as flickering LEDs, unstable signals, or even hardware malfunctions.

Thanks for documenting your solution!

@Nino said in PowerBlock Status and Shutdown don’t work:

Ok... made some progress and want to share my insights.

If you want to use different than the default pins to connect the powerblock to the rpi you should NOT use the range of GPIO1 to GPIO8 for the status pin. These are per default driven HIGH. The others (including the defaults used by power block) are driven LOW. I tried to change that behaviour using the gpio=... and gpio_poweroff=... commands in config.txt without full success. After switching now to GPIO9 and GPIO25 the power block works (I disables SPI just to be sure because GPIO25 belongs to SPI per default).

Reconfigure PowerBlock pin usage?