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by tercel
Mon Jun 22, 2015 5:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO pin will not hold its output value
Replies: 5
Views: 5149

Re: GPIO pin will not hold its output value

Yes, strange indeed. I've decided just to implement a workaround for now, as I don't need all the pins right away (i.e. some watering zones don't yet exist). So I'm avoiding using the GPIO pins observed to have strange behaviour, and made my controller software re-write the GPIO output values period...
by tercel
Sun Jun 21, 2015 6:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO pin will not hold its output value
Replies: 5
Views: 5149

Re: GPIO pin will not hold its output value

Hi guys, thanks for your replies. OK, I'm back at my Pi now. First, to answer Gerhard's questions: 1) I probe the output with either a logic probe or my Bitscope (which has a bunch of logic inputs I can display the state of onscreen) 2) I have no other user level applications running at all, so are ...
by tercel
Fri Jun 19, 2015 8:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO pin will not hold its output value
Replies: 5
Views: 5149

GPIO pin will not hold its output value

I've been a Raspberry Pi user for a while now, but this is my first experience with the GPIO. I am trying to use it in a very simple application to command a relay board (simple 1:1 GPIO-pin-to-relay relationship). My problem is that GPIO pin 27 (BCM mapping) will not hold its commanded output value...

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