Timeline for Powering Raspberry Pi via battery pack and buck converter - how to solve low voltage reboot issues
Current License: CC BY-SA 4.0
27 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 16, 2023 at 10:58 | answer | added | user146487 | timeline score: 0 | |
| Sep 17, 2022 at 3:00 | history | tweeted | twitter.com/StackRaspi/status/1570970810197676032 | ||
| Feb 11, 2021 at 0:54 | answer | added | Naima | timeline score: 2 | |
| Oct 16, 2020 at 20:40 | vote | accept | g491 | ||
| Oct 14, 2020 at 16:21 | comment | added | Seamus | @g491: RE 1.- In general, 2 or more power sources can be realized through active switching, or in a "wired-OR" config like this. But this is is not a good idea for your marginal case as the diode is another power loss. RE 2.- You still don't seem to understand that "there is no free lunch" - a capacitor does not add power, it consumes it. Not much, but no - it won't help. I'm done here. | |
| Oct 14, 2020 at 14:56 | comment | added | g491 | @Seamus I've updated my question to include the last couple items I'd ideally like to know. Thank you for the helpful information thus far. | |
| Oct 14, 2020 at 14:51 | history | edited | g491 | CC BY-SA 4.0 |
Added additional items to finalize question after reviewing answers
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| Oct 14, 2020 at 7:14 | comment | added | Seamus | Is there something else you're waiting for in terms of an answer? | |
| Oct 13, 2020 at 6:20 | history | edited | g491 | CC BY-SA 4.0 |
Added hyperlink to Amazon item as requested by user MatsKarlson
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| Oct 13, 2020 at 6:16 | comment | added | Mats Karlsson | Please edit your Q and add that info there in the right format. | |
| Oct 13, 2020 at 6:16 | comment | added | g491 | @Seamus 5 min would be fine, though longer if possible | |
| Oct 13, 2020 at 6:15 | comment | added | g491 | @MatsKarlsson www.amazon.com/Converter-DROK-Adjustable-Regulator-Voltmeter/dp/B00Q48BRFO | |
| Oct 12, 2020 at 22:16 | comment | added | Seamus | Do you have an objective for how long you need the batteries to support the RPi? | |
| Oct 12, 2020 at 10:00 | comment | added | BowlOfRed | The book you are using appears to have been published prior to the announcement of the PI model 4. The 4 requires more power than previous versions. It's possible that lower-power models would work with your setup. The 4 seems a poor choice if your application needs to be battery-powered. | |
| Oct 12, 2020 at 8:10 | answer | added | Dmitry Grigoryev | timeline score: 2 | |
| Oct 12, 2020 at 7:43 | comment | added | Mats Karlsson | And please add a URL to the "Amazon item B00Q48BRFO" because Amazon doesn't recognize that article. | |
| Oct 12, 2020 at 7:42 | comment | added | Mats Karlsson | Take a look at web.mit.edu/evt/summary_battery_specifications.pdf | |
| Oct 12, 2020 at 7:40 | history | became hot network question | |||
| Oct 12, 2020 at 1:51 | comment | added | Milliways | The energy density of an alkaline cell is low (something like 450mAH from memory) - good cells CAN provide high currents (very inefficiently) for short periods - BUT the voltage drops very rapidly. NiMH cells are better - up to 2400mAH, although this ranges from 800mAH. The only realistic solution is a Lithium battery. Many decades ago I spend some time testing batteries and found NiMH cells are usable up to 1A. Nothing you can do is going change the fundamental battery chemistry. | |
| Oct 12, 2020 at 1:40 | comment | added | g491 | @Milliways Any thoughts on why it was able to start up fine sometimes? Or why the book on building a robot with a Raspberry Pi gave this architecture? I don't intend to be using the Raspberry Pi under load, so maybe there's some component I could introduce to absorb some peaks on bootup but I'm not very familiar with electronics (thinking maybe a capacitor). | |
| Oct 12, 2020 at 1:30 | comment | added | Milliways | It is totally unrealistic to power a Pi from AA batteries - they just can't supply the current. | |
| Oct 12, 2020 at 0:56 | comment | added | Jaromanda X | an answer is more likely to have pertinent information, I'd trust seamus, he seems to know what he's saying | |
| Oct 12, 2020 at 0:51 | comment | added | g491 | Thanks @JaromandaX - do you think using a different converter or other component would be helpful, or is it an underlying limitation of the batteries like Seamus said in the answer below? | |
| Oct 12, 2020 at 0:33 | answer | added | Seamus | timeline score: 6 | |
| Oct 12, 2020 at 0:27 | comment | added | Jaromanda X | it's the current that's the problem - clearly your buck converter doesn't supply enough current - anywhere up to 3 amps for a pi 4, though probably less than 2 if you have nothing connected to the USB ports - which you haven't mentioned | |
| Oct 11, 2020 at 23:41 | review | First posts | |||
| Oct 12, 2020 at 20:17 | |||||
| Oct 11, 2020 at 23:36 | history | asked | g491 | CC BY-SA 4.0 |