3 Digit Number Counter (up down counter) using Attiny AVR MCU
This is a three digit number counter system using a attiny mcu. seven segments are used as display unit.assembly language is used with arduino to build the firmware.the buzzer indicator is fully analog part so had to isolate the ground comes from that unit.whole unit is powered by 18650 3.7v battery.74hc595 shift registers are used as seven segment drivers.this way this counter unit will last longer than multiplexing systems.power consumption is very low so the battery will also last long.18650 battery charger module is used to re-charge the battery and it comes alone with over-discharge,over-charge and short circuit protection.
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