So we are back with an update to the NiMh battery charger. In this iteration, we are able to charge a single NiMh AA battery(more batteries would only require a different battery holder) in constant current mode. Charging is stopped when when the INA219 current sensor module detects a drop in the current (negative delta V).
Once We have this running reliably, the next step is to take what we learned here and apply it to a LiPo battery.
All of my sketches are available here: https://www.dropbox.com/sh/m6c40pu99fqxb5b/AAD1Gzn6F4Hy8v9RrTZSxQyHa?dl=0
Links to all of the modules used here:
INA219 Current Sensor:https://www.amazon.com/gp/product/B01ICN5OAM/ref=oh_aui_detailpage_o06_s03?ie=UTF8&psc=1
Yeeco DC-DC Buck Converter : https://www.amazon.com/gp/product/B0159W0UL2/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
.96 OLED Display: https://www.amazon.com/Diymall-Serial-128×64-Display-Arduino/dp/B00O2KDQBE/ref=sr_1_1?ie=UTF8&qid=1487781554&sr=8-1&keywords=96+oled+display
Please watch: “Diodes: The basic building block of all digital circuits”