I am developing a personal project at the end of which I should be able to create a homemade alarm system.
All this should be protected against voltage drops/failures, the whole circuit will be inside a "box" that I will print with the 3d printer.
To be precise, the project foresees these components:
- Raspberry Pi 0 with Domoticz (80 mA / 0.4 W)
- Sonoff RF Bridge with Tasmota (30 ~ 200mA/3.0 ~ 3.6V)
- Step up circuit (optional)
I'm looking for a circuit that works as an "UPS/backup battery", which allows me to keep the system running for as long as possible (1h would be the top). A PC UPS (just to be clear) must be excluded as a solution, power banks apparently are not good as manufacturers advise against charging them and powering devices at the same time.
I have tried circuits like this but they are very poor, the battery does not hold up and unfortunately the charge readings through the GPIO are not realistic.