Hello to all!
I would like to create a meteo-station self-powered via solar panel. It would use the libraries developed on mysensors.org, which are using nrf24l01+ network radios. I've create the whole structure (GW, controller, nodes) and all works well. Now I would like to create an outside station, self powered.
I've read a lot of artcles about how to recharge a Lipo Battery and power up an Arduino Pro Mini 3.3v but I'm really confused now...
So, could someone give me some hints? I know there are boards they do a lot of the charging stuff, but I would like to spend less as possible and try to create something by myself
AFAI've understood, let me explain what I should need:
1 solar panel. Which one shuld be the best? If I use a solar panel over 6V output, should I use a DC-DC converter like this?
Also better higher voltage and a Step down converter or a 6V solar panel without Step down converter?
1 battery charging module. Which is better?
I've only seen the first has a battery charging protector and it has another two pins: OUT+ and OUT-. Which should I choose and why?
1 Lipo battery
Should I take a little 1000mA Lipo battery like this:
OR is better a 18650 battery, i.e. 3000mA like this?
Then, If I use a 1000mA Lipo and the BOARD2 I should need change the resistance from default to 3K to give an output of 400mA to avoid damages to the 1000mA battery. Is it the same on the BOARD1? Have not find the resistence.
And, where to connect then the Arduino Pro Mini? On the BOARD1 there are the OUT pins. What about BOARD2?
And, again, if I use a Pro Mini 3.3V, could I attach it directly to the VIN power? Seems yes, the ATMEGA works from 1.8V up to 5, but to be sure.
So, I've a lot of confusion, please, help
Thanks a lot!!!