So I'm new to low-voltage circuitry and electronics in general. I've posted the below outline on Reddit and everyone is telling me I need a battery, but I'm not sure why given my constraints. Hoping for some clarification:
"I want to use JUST a solar panel to power an ESP-12F and a Capacitive Soil Moisture Sensor (CSMS). I dont mind if it doesnt run on a cloudy day, and it does not need to run overnight. [ie. a couple of readings a day in perfect circumstances would be sufficient]
I want the ESP-12F to wake from deep sleep check the soil moisture via an input on the A0. It will send the moisture level to a MQTT broker running on the same network, then go back into deep sleep. I'm aware that I will need to divide down the CSMS output (0-3v) to an ingest-able 0-1v for the A0 pin on the ESP-12F.
I figure I will need a 5v 150mA solar panel and a LDO voltage regulator to get a consistent 3.3v for the ESP and CSMS. I'm looking for recommendations on the above as well as pointing out any shortcomings of my design.
Thanks in advance!"