[ryaowe]

New RPi got here yesterday, and has been running with the OSPi attached for 24 hours now, so it looks like the problem was actually the RPi.

I did try running the old RPi disconnected from the OSPi GPIO pins, and it worked without problems, which is why I was thinking it had to be the OSPi.

Anyway, the problem seems to be fixed for now.

[ryaowe]

I tried powering the RPi from the OSPi board, but with the boards physically separated (as suggested by craigmw). The problem still happens, so it doesn’t look like it’s the support pillars.

I ran the RPi by itself overnight compiling a big codebase to see if I could trigger the problem without the OSPi board involved at all. It ran all night without problems.

I also measured the difference before and after the F3 polyfuse after the problem had occurred, but there was still a <0.1v difference, so I don't think it's that.

I got the new transformer and now voltage between TP1&TP2 when powered through the OSPi is 4.93. Before the polyfuse is 4.93, after is 4.91.

I’m pretty ignorant when it comes to electronics, but it seems like all signs point to it not being a power problem.

I’m still waiting on the new RPi that I ordered, but at this point I’m strongly suspecting a problem with the OSPi. Is there anything I can do to prove/disprove it?

Thanks again for your help!

[ryaowe]

Thanks for the ideas! I ordered a new Raspberry Pi and a new 24VAC transformer. They should get here in a couple of days; I’ll post if the problem persists.

If it does, is there a way to verify if there is a problem with the OSPi cable?

[ryaowe]

After messing with it for a while longer, I’ve discovered that the problem does actually happen when the raspberry pi is powered by USB, it just takes quite a bit longer for it to happen. However, after several hours of trying, I haven’t been able to get the problem to happen when the opensprinkler board is disconnected.

Dumb question… the opensprinkler board comes with four support pillars for the raspberry pi board to connect to, but there are only two holes on the raspberry pi. Could the other two support pillars be shorting something out on the back side of the raspberry pi?

I also measured the voltage before and after the F3 polyfuse (as described here: http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems). The difference is around 0.1v, which is well within range according to the troubleshooting guide.

I’ve ordered another raspberry pi to try to see if that resolves the issue. We’ll see how it goes.

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