An advanced lithium battery charger and powerbank with a SSD1306 OLED display based on the BQ25896 IC and ATMEGA32U4 MCU. I wanted to make a battery charger that was not based on the popular Chinese TP4056 IC that you see all over the internet. So after some research I came across the Texas Instruments BQ25896, this is a single cell 3A charger that can be controlled using I2C, it also has a boost mode and can turn the connected battery into a powerbank delivering up to 2A of current. This charger IC is typically used in mobiles and I did not hand solder it, all the other standard SMD components were hand soldered.
Just some random circuits that I've built.