I developed Arduino based Battery discharger and capacity tester. This device has precise performance, excellent interface and stylish design.
The principle is as follows,
1. Set one AA battery and apply a load with a 1Ω resistor (3W).
2. Measure the current with the current measurement module(INA219).
3. Calculate the voltage (Ohm's law: current A ☓ resistance Ω = voltage V)
4. Display voltage and current on the screen.
5. Display the voltage change as a graph.
6. Display the cumulative current on the screen (= battery capacity).
7. When the final voltage (set to 0.95V) is reached, the current is cut by relay.
I tested following Ni-MH batteries in this video.
Panasonic eneloop
DAISO(100 yen shop) cheap battery
BTY 3000 HR6 MIGNON
Regarding the program code, please visit my web site.
(Sorry the site is Japanese, but the code is English)
[ Ссылка ]
