1. Circuit diagram
2. Parts we need in the project
3. Screenshot of some steps
4. Finished and test
Product list:
ATmega328 https://www.utsource.net/itm/p/6464451.html
Bluetooth module hc-05 https://www.utsource.net/itm/p/8028175.html
Relay SRD-05VDC https://www.utsource.net/itm/p/8404773.html
16.000MHz 16M Quartz Crystal https://www.utsource.net/itm/p/6492587.html
More details, plc check here on Youtube: