techn0man1ac / ATtiny13BatteryProtect

LEAD Acid Battery Protection board, based on ATtiny13

ATtiny13BatteryProtect

Simple 12V battery LEAD Acid Battery Protection board based ATtiny13 microcontroller.

How it's work?

Have relay and use it battery disconnect load(deep discharge protecti) if voltage < 10.5V + have level indicator with 3 LEDs:

PB0 1 LED 100% Charge level - >12.5 V;

PB1 2 LED 65% Charge level - >11.7 V;

PB2 3 LED 35% Charge level - >11.1 V;

PB3 voltmeter, 50 kOhm and 10 kOhm + 1 kOhm variable resistor;

PB4 Relay.

Source code(for Arduino IDE - "ATtiny13BatteryProtect/ATtiny13BatteryProtect.ino") here:

https://github.com/techn0man1ac/ATtiny13BatteryProtect/tree/main/Code

It's project full open source(PCB and code).

PCB 3D model

PCB Up side:

PCB Down side:

PCB sizes 65 x 30 mm

PCB home page:

https://oshwlab.com/raznie.podelki/attiny13batteryprotect

Schematic:

Gerber files and 3D model:

https://github.com/techn0man1ac/ATtiny13BatteryProtect/tree/main/PCB