Simple Battery Capacity Tester using Sparkfun Arduino Pro Micro and 32x128 SSD1306 OLED screen

PINS connections : SSD1306 Oled Display SDA -> PIN2 SCK -> PIN3

You can access the menu when discharge is off by clicking the pushbutton. Navigate in menu using push button (up or down depending on the On/Off state, longpress to select item in menu)

To Do :

• [OK] Add feature to store data in EEPROM to keep data even after reset or unwanted poweroff
• [OK] Add Menu
• [OK] Erase EEPROM via menu caapability
• [OK] Try to implement battery internal Resistance calculator
• [OK] fix time shifting toooo much
• [OK] Make readable schematics
• Add Wh counter
• Add Wh counter to EEPROM
• Add seconds elapsed to EEPROM
• Add max intensity parameter to prevent from short circuit or load resistance too low
• Add History function
• Connect & control Buck/boost to charge ?
• Add Voltage divider feature in code to allow multi-cells accus
• Add Low Voltage cut-off parameter in menu and store it into the EEPROM
• Add an avenced Menu to modify parameters such as : shunt resistor, pin difinitions, stop discharge voltage etc...

Exemple result on screen with Ni-MH 1.2V Cell :

My actual prototype looks like :

You can find all files for schematics in the kicad path :