1. All the materials we need in this project.

2. Some screenshot of the steps.

3. Finished.

4. Test.

Product list:

SPDT RELAY  http://bit.ly/2MKR8xN

TRANSISTOR C1815  http://bit.ly/2Hf1jtN

RESISTOR 10K http://bit.ly/2TMSWXV

RESISTOR 2K2 http://bit.ly/2AJVU8g

RESISTOR 1K http://bit.ly/2Uk6Zot

DIODE 1N4148 http://bit.ly/2RQimq8

LM7805 http://bit.ly/2NAK9tN

LED 3V http://bit.ly/2IkuH1s

CAPACITOR 100nF http://bit.ly/2QK6ph7

CAPACITOR 100uF/16V http://bit.ly/2RMTpMi

More details, pls check the video on Youtube：