Motion Sensor Light Switch using CD4017 & IR sensor
I have shown how to make a motion sensor light switch using the CD4017 IC and IR proximity sensor. You can use this motion activated light circuit as an automatic washroom light switch. I have not used any microcontroller or Arduino for this CD4017 project.
When anyone enters the washroom the IR proximity sensor senses the motion and turns on the light.
After that when he or she exits the washroom, the IR sensor again senses the motion and turns off the light.
Here, each time the IR proximity sensor detects any motion, it sends the clock pulse to CD4017 IC. Then the 4017 changes its previous state.
Circuit of the Motion Sensor Light
How the Motion Sensor Circuit works
1 The IR emitter LED continuously emits infrared. When any object comes within the range, some amount of infrared reflects from the object’s surface and that reflected infrared can be detected by the IR receiver LED.
2 The LM358 compares the voltage across the IR receiver LED with the predefined value. When any motion is detected the voltage across the IR receiver crosses the predefined value, so the output pin (pin 1) of LM358 becomes high.
3 The clock pin (Pin-14) of CD4017 IC is connected to the output pin of LM358. So when any motion is detected, the 4017 IC receives a clock pulse and changes the current state of Pin-2.
4 The Pin-2 of CD4017 is connected with the base of the BC547 NPN transistor, So when the Pin-2 becomes high the transistor turns on.
5 When the transistor turns on, the current can flow through the relay coil. So the load connected with the relay also turns on.
6 When the IR LEDs detect any motion the second time, it sends the next clock pulse to CD4017 IC. Then the Pin-2 becomes low.
7 If the Pin-2 becomes low, the transistor turns off, and accordingly the load connected with the relay also turns off.
Motion Sensor Light Switch using CD4017 & IR sensor
I have shown how to make a motion sensor light switch using the CD4017 IC and IR proximity sensor. You can use this motion activated light circuit as an automatic washroom light switch. I have not used any microcontroller or Arduino for this CD4017 project.
When anyone enters the washroom the IR proximity sensor senses the motion and turns on the light.
After that when he or she exits the washroom, the IR sensor again senses the motion and turns off the light.
Here, each time the IR proximity sensor detects any motion, it sends the clock pulse to CD4017 IC. Then the 4017 changes its previous state.
Circuit of the Motion Sensor Light
How the Motion Sensor Circuit works
1 The IR emitter LED continuously emits infrared. When any object comes within the range, some amount of infrared reflects from the object’s surface and that reflected infrared can be detected by the IR receiver LED.
2 The LM358 compares the voltage across the IR receiver LED with the predefined value. When any motion is detected the voltage across the IR receiver crosses the predefined value, so the output pin (pin 1) of LM358 becomes high.
3 The clock pin (Pin-14) of CD4017 IC is connected to the output pin of LM358. So when any motion is detected, the 4017 IC receives a clock pulse and changes the current state of Pin-2.
4 The Pin-2 of CD4017 is connected with the base of the BC547 NPN transistor, So when the Pin-2 becomes high the transistor turns on.
5 When the transistor turns on, the current can flow through the relay coil. So the load connected with the relay also turns on.
6 When the IR LEDs detect any motion the second time, it sends the next clock pulse to CD4017 IC. Then the Pin-2 becomes low.
7 If the Pin-2 becomes low, the transistor turns off, and accordingly the load connected with the relay also turns off.
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