Arduino control LED by Relay 5V

 Arduino control LED by using Relay 5V

Purpose:           Relay can't pull the metal from NO to NC until the signal from Arduino push the base pin of transistor. 

Diagram

  

  

we need to let the signal  from  arduino to push transistor in order to let the electron that run through the coil relay 5v into the ground. Then relay will pull the metal from NC-NO,led light.  

 Component

        - Arduino uno

        - relay 5V

        - Transistor BC547

        - diode LN4004

        - Led

        - T-block

        - wire jumper 

        - resistor 

        - pin connector

Schematic 

PCB layout

3D view

Final Result