2 buttons control relay for turn on/off a bulb
Purpose: Use 2 button to control relay in order to turn on and turn off a bulb.
We use 2 button to control relay. One is NO button use for turn on and other is NC button use for turn off. Both relay are parallel each other. when we push the button 1 (turn on) the electron run into the coil of 1 relay then the metal pull from NC to NO and button 2 also change from NC to NO then a bulb light . Even though we take our hand off from button a bulb still light if we connect code(+) to No and ground to Com of relay. But make should that your bulb must have battery.
component
- Relay x2
- Button x2
- bulb
- led
- T-block
- wire jumper
Process
- connect DC 5v to both button
- connect code from button to coil (+) and ground to coil (-) of relay 1.
- connect code from button to NO and ground to Com of relay 1.
- connect relay 1 and relay 2 as parallel.
- connect No and Com of relay 2 to the bulb.
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| Schematic |
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| Use for design schematic and PCB |
PCB layout
3D view
Final Product
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