Timeline for What happens with Arduino digital pin 12 when the power is OFF
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Oct 6, 2014 at 9:07 | vote | accept | Andrey Dyachenko | ||
| Oct 3, 2014 at 13:53 | comment | added | Andrey Dyachenko | the "external device" is a mass-spectrometer. I hook up a crocodile clip to one of its test points on an RF electronics PCB. From this point I read a 5V trigger signal that is also triggering other stuff that is happening and that I want to synchronize the laser with. So if something weird gets connected to this test point, it can potentially screw up internal triggering, and that is what I think is happening. I still have to try Dave's solution with the resistor. Any other ideas? | |
| Oct 3, 2014 at 13:08 | comment | added | KyranF | What is your "external device" actually doing? Can you please describe more of what that is, and how it exerts a signal into the Pin 12 if your Uno? I suspect that it's a floating pin when the ATMEGA goes Tr-state when turned off. The floating pin might somehow feed back to the external device and upset it's ability to generate signals. Still very strange though. | |
| Oct 3, 2014 at 11:53 | answer | added | Dave Tweed | timeline score: 3 | |
| Oct 3, 2014 at 10:25 | answer | added | Dzarda | timeline score: -1 | |
| Oct 3, 2014 at 9:58 | history | edited | Andrey Dyachenko | CC BY-SA 3.0 |
added 46 characters in body
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| Oct 3, 2014 at 9:52 | history | asked | Andrey Dyachenko | CC BY-SA 3.0 |