1. The part we need in this project.

2. Some steps.

3. Test it.

4. Diagram circuit.

Product list:

LED    https://www.utsource.net/category/led-lighting-1.html

BC547/ BC548  https://www.utsource.net/sch/BC547

Resistor   https://www.utsource.net/category/passive-components/resistors-1.html

Capacitor  https://www.utsource.net/category/passive-components/capacitors-1.html

Buzzer   https://www.utsource.net/sch/Buzzer

More details, pls check the video on Youtube: