Wawa:
Just try a single resistor (no divider) between battery and analogue input.
Experiment with the value until you get an A/D value of ~1000 with a 4.2volt source.
Leo..
I don't understand what is happening, I tried to do what you recommanded, to place just a resistor between the + and the TOUT pin, it took me a while to find an good value, and I dont know if there are any online calculators, like there is for the voltage divider, but the resistor that dropped the voltage from 4v to 0.9v was a 3.3M resistor. If I measured the voltage between the ground and through this resistor I had exactly 0.92v, this should have been good. But after soldering the resistor on the board, like in the photo bellow, the red wire is going to the A0 pin, the voltage is just 0.2v, I don't understand why this is happening. There is a voltage divider on the board ?
wvmarle:
There's a very short a datasheet available.Interestingly no word about an analog in on that chip, just a TOUT pin which supposedly can be used to monitor a battery voltage.
I want to use this board to see how much time, hopefully years, it can run togheter with a small 5v soalar panel (69x150mm).