With circuit diagram upgrade, it consumes less power than before.
* The mode of operation.
- Battery charging mode.
- Finger vibration mode.
- Sound mode.
- Alarm mode (Acts as an alarm device in the house. If there is a moving object it will emit sound. Alarm mode is started by pressing hold two " + - " nodes in 3 seconds).
+ The device automatically turns off the power when the voltage on the battery is less than 3.6 volts.
+ Two buttons " + , - " Used to set, increase or decrease the volume of Buzzer or vibrating motors. (Save settings to EEPROM).
+ Voltage boost module (3.7V --> 7V). Used to power the Arduino pro mini.