Daily I used to get scolding from my wife ????because I always forgot to switch off the lights????in my bathroom so I decide to make a motion-activated light so the light will automatically get turned ON when I enter the bathroom and will get automatically turned OFF after sometime after I am out????
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Project sponsored by wellpcb
Working
Mainly we are using a PIR motion sensor which will detect the motion using the temperature difference. When a motion is detected the OUT pin of the PIR sensor will become HIGH which we will connect to a BC547 transistor to drive the 12v or 5v relay. We can connect the light bulb to the C (common) and NO (normally open) of the relay.
Hardware Required
| Components | Amazon | Banggood | AliExpress |
|---|---|---|---|
| PIR Motion Sensor |  | | |
| Relay 12v/5v | | | |
| Diode 1N4007 | | | |
| Resistor 1k | | | |
| BC547 | | | |
Circuit
Use the below circuit if you are using 5v relay ????????
- Connect the OUT of PIR sensor to the BASE of BC547 transistor via the 1k RESISTOR.
- Connect the GND of PIR sensor and EMITTER of BC547 to the main GND.
- Connect the COLLECTOR of BC547 to one of the COIL terminals of the RELAY.
- Connect 5v supply to PIR VCC and the other COIL terminal of the RELAY.
- Connect a Diode 1N4007 across the RELAY COIL terminal as shown in the circuit.
- Use the C & NO connections of the RELAY to connect to the light bulb
If you are using 12v relay instead use the below circuit ????????
- Connect the OUT of PIR sensor to the BASE of BC547 transistor via the 1k RESISTOR.
- Connect the GND of PIR sensor and EMITTER of BC547 to the main GND.
- Connect the COLLECTOR of BC547 to one of the COIL terminals of the RELAY.
- Connect 5v supply to PIR VCC.
- Connect the 12v supply to one of the RELAY COIL terminals.
- Connect a Diode 1N4007 across the RELAY COIL terminal as shown in the circuit.
- Use the C & NO connections of the RELAY to connect to the light bulb
PCB
Download Gerber files
Download the PCB Gerber files for motion activated switch ????????
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