I am using a raspberry pi 3 model B (5V/2A), a sainsmart 7" lcd display (12V/2.5A), and a ESP8266 2.4Ghz transceiver (3.3V) for a project. It needs to be mobile, so what kind of power supply components would I need to run it from batteries?
You need one 12V battery with enough amp-hours to give you a viable lifespan, one 5V UBEC and one 3.3V regulator (with a couple of capacitors on its input and output for stability).
- Connect the battery to the display, the UBEC and the regulator.
- Connect the UBEC to the Pi.
- Connect the regulator to the ESP8266.