I have a Paspberry PI 1 with the OnOff-SHIM attached. Soldered to the female connector which is pluged to the GPIO.
I’ve run the oneline installer.
I can power down the PI by pressing the onboard button, but once it reached PowerOff state I cannot power it back on using the shim. (On cold boot, the PI is immediately starting as soon as I connect USB to the shim.)
I don’t know exacly how it is supposed to be, but the 5V and 3.3V gpio pins staying fully powered at this poweroff state.
- Somewere I saw that BCM4 should ground when pressing the button, but this is not happening. It stays at 3.3V.
- BCM17 does seem to ground when the button is pressed (Voltage drops when measured between BCM17 and ground, and button is pressed). But that is the tigger for the cleanshutd deamon, so I kind of knew that.
- I checked that I have no shorts between the pins (only the two 5V pins seems to be internally connected and the two grounds, which I think is correct)
- When shutdown is in progress the BCM4 is beeing put into low (no voltage between BCM4 and Ground), but as soon as the PowerOff state is sucessfully reached it jumps back to 3.3V
- The shim led does light up when pressing the button.
- There is not difference when using the onboard button or the BTN connectors.
- I tried the shim on another RPI2. Connecting the power to the shim it immediately boots, than I shutdown it via CLI. Than I test to repower it via the button and it fails (no software installed).
I don’t know what else can be checked or measured as I dont know what is supposed to happen at the pins.