In this project, we're going to make a keyless door lock system that uses a 4X4 keypad to enter the keys and a servo motor to open or close.

I modified a Blynk-controlled car using Adafruit Feather 32u4 Bluefruit LE. I used the Accelerometer widget of Blynk.

Fun way to introduce kids to circuitry and electronic prototyping and to explain them importance of energy saving!