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Forum Index : Microcontroller and PC projects : 18650 UPS module
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| MikeO Senior Member  Joined: 11/09/2011 Location: AustraliaPosts: 275 |
UPS made a bit smarter by the addition of picomite. The 5volt output is switched with the addition of a High side P channel mosfet . Charged output from 4056 and UPS power input are both monitored so UPS run time on batteries can be managed. Status Led and Soft Power switch allow Startup and Shutdown (and power off) of the attached Raspberry Pi.Just printing mounting hardware for the case but here is parts sitting roughly in position. Pi Zero is sitting under the perf board. .jpg) Codenquilts |
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| lizby Guru  Joined: 17/05/2016 Location: United StatesPosts: 3150 |
Nice, Mike. I ordered both the 5V and 12V versions. The 5V has a 3002 for R7 and a 1002 for R9, while the 12V version has a 9102 for R7 and a 103 for R9. I just charged them but haven't yet put them to any tests. In my version there are unconnected solder blobs next the R7 and R9 labelled R7* and R9*. Mike--have you determined yet how long your Pi will run with these dual 18650 backups? I have a functionally similar PiZW that I want to provide backup for. Soon, I hope, to be a PiZ2W. ~ Edited 2023-09-09 21:12 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| MikeO Senior Member Joined: 11/09/2011 Location: AustraliaPosts: 275 |
Hi Lizby, Those solder blobs are for resistors in parallel. Have you checked the 5v output , it may be a little low especially if you are going to power a Raspberry Pi , they tend to be picky about their 5v supply. They are better run at say 5.15vdc and for that reason on my UPS units I have replaced R7 with a trim pot so I can trim up the output voltage. I the photo I added 20k + 20K on this one as its all I had but on another I added 100K then you can set from ~ 4.8v to >12vdc. .jpg) The cells I am using are re claimed from old battery packs and I don't actually know their capacity but a RPI Zero W V1 that I will be using averaged somewhere in the order of 180mA so depending on the cells I have I am conservatively expecting 10 hrs plus. I will do some run tests soon as i will need that info to put in the software. Keep you posted, Mike Codenquilts |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
Thanks for the information, Mike. Good hack. I wonder if anyone knows whether the PiZ2W has the same touchiness about the 5V supply. Pi Hut sent me a notice that the PiZ2W was back in stock, but by the time I figured out how many I wanted (2 days), they were sold out. Supposed to have 5 times the speed (for certain tasks). PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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