Technical specifications of the project:-
- Variable voltage regulator.
- 3S Li-ion battery charging capability, with the necessary battery protection circuit,short circuit protection, overcharge protection, over-discharge protection
- 4x LEDs to indicate battery level. Similar to the power banks in the market, 1x LED indicates 25% battery level, 2x LEDs indicate 50% battery level. Blinking LED means charging.
- 1x tactile push button to control the variable voltage output, 7V, 9V and 12V. Tactile push button sequence,
- 1st short press = indicate battery level, if no input from button within 5 seconds, = POWER OFF
- 1st LONG PRESS = 7V
- 2nd short press = 9V
- 3rd short press = 12V
- 4th short press = OFF
- Input source is 3x 10440 type Li-Ion cell, lined up in parallel.
- Charging source is via micro usb B, 5V
- Load is a 12V Dc motor, power rating 0.8W.
- Used components are commonly available.
- The PCB has a custom shape and the button, LEDs, micro-usb port and output connectors position.
