Timeline for Raspberry Pi reset circuit
Current License: CC BY-SA 3.0
41 events
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| Feb 10 at 13:07 | comment | added | Abel | Even simpler: mount SD read only and avoid corruption. Pi has such settings. If you need an sd for logging, add one over usb. Having an external power cycler is probably good to have too just in case it locks up or something, but not needed for preventing sd corruption. You also don't need anything fancier than some diodes and caps to 'switch' between battery and AC (powering the DC rail) | |
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| Apr 7, 2018 at 1:29 | history | edited | user39382 |
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| Dec 30, 2017 at 5:34 | comment | added | Chris Stratton | The problem statement seems to be mistaken. You don't need to "reset" the pi, rather you need to disconnect it from the battery supply, and only reconnect it to the AC mains after those have been stable for a credible amount of time and the battery has charged enough that it will be able to sustain operation of the pi for the amount of time required to cleanly shut it down again, should the AC mains almost immediately fail. | |
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| Aug 3, 2017 at 7:10 | answer | added | Dmitry Grigoryev | timeline score: 1 | |
| Aug 3, 2017 at 4:44 | comment | added | Rustie0125 | That sounds correct in principle yes, just remember the circuit is 5v logic and pi can only handle 3.3v on GPIO's | |
| Aug 2, 2017 at 16:04 | comment | added | Vince Patron | I'm thinking you need 3 things: 1) A comparator that tells you the AC mains is gone, 2) A comparator that tells you your battery voltage is low, 3) A pair of edge-triggered D-flip flops. In the Rpi, you run SW that senses when AC is gone AND your battery is low. If true then it drives an IO high to trigger a flip-flop to tell it Rpi will need a reset. Then you run shutdown command on Rpi. Now that the flip-flip is activated, the next time AC comes back, it holds the Pi RESET line low for say a second. Does that sounds right? Let me know and I'll post an answer. | |
| Aug 1, 2017 at 12:27 | answer | added | Rustie0125 | timeline score: 0 | |
| Aug 1, 2017 at 7:26 | answer | added | Jason Han | timeline score: 1 | |
| Aug 1, 2017 at 4:49 | comment | added | jonk | Are you just asking for a "brown-out" circuit? | |
| Aug 1, 2017 at 4:46 | review | First posts | |||
| Aug 1, 2017 at 9:48 | |||||
| Aug 1, 2017 at 4:44 | history | asked | Rustie0125 | CC BY-SA 3.0 |