I am building GPS datalogger. It will consist of Arduino Pro Mini 3.3V, GPS module - GY-GPS6MV2 (GPS Ublox NEO-6M) (bypassing 3.3V regulator) or Skylab SKM53 (MT3329). Data will be written to SPI Flash W25Q64FVSIG and later read via USB with FT232RL FTDI 3.3V.
I am looking for a power supply solution having following criteria:
- powering with multiple standard rechargable NiMH 1.2V AA batteries
- effective power supply capable of higher current (my guess is 150mA but I am not 100% sure about this)
- automatic circuit cutoff on voltage drop below minimum recommended for the circuit and also for NiMH batteries to not to overdischarge and damage them
- notification of low battery power (eg. by bliking LED) before cutoff
So far I was trying to use DC-DC step-up voltage convertor with together 4 batteries - two pairs of serially connected baterries finally connected in parallel so they can provide doulbe current, but the circuit seems to require more current. Maybe I should probably consider rather some more powerful DC-DC step-down voltage convertor.
I've asked about automatic circuit cutoff and notification of low battery power already but I would appreciate to have a complete solution combined with all four requirements.
I will appreciate a solution to this complex yet common problem.