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Topic starter
Hi, I have a Pi4b and am also looking to purchase a pizero2w for a project that I am building which will eventually run, remotely off a battery pack. I think the Witty Pi solution would be ideal for the 2 functions that I need
1. I need something to monitor battery supply such that it can initiate a graceful shutdown command to the Pi before the battery is depleted.
2. It would also be good to be able to schedule shutdown and start up times, to extend battery life (Pi only needs to be on for certain times of the day)
Would your mini (or l3v7) be suitable - and what is the difference between them.
BTW, I will be using a 5V battery pack and therefore dont need the more expensive version that handles multiple input voltages.
Thanks
Russ
Posted : 13/03/2025 1:26 pm
I guess you mean "power bank" when you say "5V battery pack". Power bank has its own DC/DC converter and it always outputs 5V until the battery runs out, so there is no way to monitor the voltage drop and do graceful shutdown when using a power bank. Witty Pi 4 Mini can be used to schedule shutdown and startup.
If you really need voltage monitoring, then you can NOT use any power bank. If you use 3.7V Li-Po battery, then Witty Pi 4 L3V7 is suitable.
For details please read the product user manuals.
Posted : 13/03/2025 1:54 pm
Topic starter
So, a powerbank will just shut off without any "warning" - right? - So, if I used a L3V7 with a 3.7v LiPo backup battery, it would "take over" from the powerbank and then the Witty would measure its input voltage from that LiPo battery and be able to issue a graceful shutdown command before a "blackout" occurs?
Posted : 13/03/2025 6:29 pm