The latest pre-assembled Gertboards should work at 5V.
Don't know, depends what happened.timb wrote:Is this, uh, covered under warranty? Who do I contact for that? What do you think happened?!
May well be right. That's one for Gert or someone who "knows about this stuff". I don't know how the buffers work, but I expect I will soon.timb wrote:I was of the understanding that you could route any digital I/O through the buffer and essentially use it as if it directly connected to the GPIO pin. It's essentially there to protect the RPi from getting fried, right?
Not for 100%. The difference is that the GPIOs can work bi-directional, so switch from input to output mode on the fly. The buffers can not do that.I was of the understanding that you could route any digital I/O through the buffer and essentially use it as if it directly connected to the GPIO pin. It's essentially there to protect the RPi from getting fried, right?
Interesting. You know, I never thought of that! The Pi was being back-fed through the bottom USB(A) port from my LapDock. Since this incident I've actually gotten a real bench supply. A nice little Korad KA3005P (that's fully controllable via RS-232/USB). It's got connectors on the front for +, - and G; would connecting G from the PS to a ground pin on the Gertboard be sufficient to eliminate the ground potential?pihead wrote:What power supply were you using for the Pi? Were the grounds of both supplies connected together?
You could have had a significant ground-potential difference between the two power supplies. When I connect external motors to the Gertboard I have used battery power to keep things simple, but as long as your two supplies have the same ground reference you should be OK. A 13.8 volt bench supply with a 5 volt regulator for the Pi might be a good way to go.
The first boards did not have 5V headers.but this unit didn't have 5V pins on it.
That's really interesting. Speaking of things not on the board, what's the deal with the blank area in the bottom right? Was there something intended to go there and pulled at the last minute or what?Gert van Loo wrote:The first boards did not have 5V headers.but this unit didn't have 5V pins on it.
The manufacturer has extra costs to keep the holes open
(Add masking tape, flow board, remove masking tape)
Which is not too bad for the big middle area but nasty for all the small isolated holes.
So I suggested it might be cheaper just to add headers.
They may be playing around with that trying to find the cheapest solution.
You mean the various footprints with no components on them?what's the deal with the blank area in the bottom right?
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