TP4056 read solar input and batterystatus

Other Hardware General Electronics
1

Hi there,
I'm pretty new into this world and I'm trying to build a very nice solar weather station.
For now i have some sensors connected to a WEMOS pro D1 mini which is working fine with a LUM sensor and a BMP280 sensor.

Since the whole setup is powered by a battery trough a TP4056 module and charged by a solar panel i want to know if the solar is providing power and how much it is. Beside that i also want to know the battery status, how much power is left in de battery.

Is there a way to achieve my goal?

Regards

2

Battery voltage is easy, and the only relevant thing.

Connect a 100k resistor between battery(+) and A0, and get it's analogue value.
With 100k in series with the onboard divider, 4.2volt should return an A/D value of 1023.
Leo..

3

Hello Leo,

You mean the A0 of the Wemos? And is there a way to know if the solar is giving some power? Is it the same trick to put a resistor on the + solar side to A0?

I want to know how much the panel is supplying to the battery.

4

The WeMos has only one analogue (voltage) input.

An INA219 breakout board (I2C) might be ok if you also want to know solar voltage/current.
This is ofcourse an extra drain on the battery.

This weather station from PaulRB (member here) might be an interesting read.
Leo..

5

Hello Leo, thank you, ive read PaulRB's article.