This is my second attempt to use a Pimeroni OnOff Shim at my Raspberry Pi 4B to build a so called Phoniebox. I receive repeatable “Under-voltage detected!” messages if using the OnOff Shim inside my setup:
- On my Rapsberry Pi 4B I connected analog speakers (Trust Compact 2.0, 6 Watts peak). The Power is drained via USB connection from the Pi.
- Neuftech card reader connected via USB)
- 27" Monitor (Dell U2715H) connected via HDMI
- Powerbank (EasyAcc PB26000MS) as power supply
Setup A) Powerbank connected via USB-C directly to the Pi: No under-voltage issues at all.
Setup B) Powerbank connected to Pimeroni OnOff Shim via Micro-USB. Shim connected via jumper wire to the Raspberry Pi. Under-Voltage during startup and during playing audio samples.
Setup C) Like Setup A but speakers and card reader are disconnected: No issues at all.
I changed the jumper-wires, USB cables and tested the setup with two different Pimeroni OnOff Shims. I’m pretty sure that I’m not to stupid to solder the pins properly.
@Support: Is there a issue with voltage or amperage inside the Shim circuits, if used Pis with higer consumer load?