How To - Build the PRS-Tech SNES-Zero

[Kory]

I am having issues where the raspberry pi is powered by the HDMI for varying lengths of time before randomly rebooting. Does anyone have a solution for this?

[YaYa]

I am having issues where the raspberry pi is powered by the HDMI for varying lengths of time before randomly rebooting. Does anyone have a solution for this?

You may suffer lack of power... try with directly powering via micro usb from a wall plug. If the problem disappear, then the problem is either your HDMI cable or the TV.
The test with another TV that can deliver power trough HDMI, if it works, the problem is the other TV not giving enough power.

[Kory]

I am having issues where the raspberry pi is powered by the HDMI for varying lengths of time before randomly rebooting. Does anyone have a solution for this?

You may suffer lack of power... try with directly powering via micro usb from a wall plug. If the problem disappear, then the problem is either your HDMI cable or the TV.
The test with another TV that can deliver power trough HDMI, if it works, the problem is the other TV not giving enough power.

So I tested the parts and it does appear to be my HDMI cable. To fix this do I just get a shorter cable?

[Brownie]

Ahhh good eye.

The best I could tell was that OPs voltage inserted isolates the TV-end HDMI power pin and only sends power back toward the Pi. According to OP this causes issues with some smart TVs so he adds the diode as a jumped to add power to the TV-end pin too. The diode prevents power going back toward the USB end but I can't imagine a scenario where this would happen.

The cheaper voltage inserter I linked above doesn't isolate the TV-end power pin (so power is sent both ways down the HDMI cable) and therefore doesn't need to be modified (unless there is some reason for the diode over a jumper that I'm not aware of - in which case the explanation from those above is inadequate due to the way the pad works, you'd need to detach the red wire and put the diode between the wire and the pad).

What I gather from this conversation is that is the HDMI USB Power adapter referenced here does not need any modification and no diode is required. Does that sound right?

[Delta]

Hey, i recently got into building all these retro game consoles and I'm fairly new at it and I'm struggling with the coding part. Any help or if you could explain it a little more would be greatly appreciated.

[deeleyer]

Hi there.
About the BAT42, is it possible to use a BAT43 instead?
I have some spares from another project, and BAT43&42 datasheets are very similar except VF Max (1V vs 400mV)