Introduction: Clap Switch (wall Switch Mountable)

About: Interested in different things i could possibly make.

are you tired trying to find a way to turn Off or turn on the light?
Would you want to be more innovative by clapping your hands like the ones in the movies?
or even access other tools with your clap

I have wondered if there would be a way to turn on or off the light by clapping since I watched a movie where in the actor just clapped and the light turned off or on. Making this project needs a lot of patience and open mindedness since a lot of problems will occur during the process. Good solder and PCB design will be very useful in this project. 

This project will work by 2 IC, the 4017 and the 741, the 741 will compare the voltage to send a pulse to the 4017 which is set as a toggle. to control any appliance there is a relay. 

Step 1: Materials Needed

You will go into 2 stages the prototype and the Fixed version but they will both use the same components

  1. 4017 Decade counter
  2. 741 Op-amp
  3. Electret MIC  (long range)
  4. NPN transistor
  5. Relay (6v)
  6. 2 LED any color
  7. Diode (rectifier)
  8. Terminal Block
  9. Battery Clip (9 volts)
  10. 9 volts battery
  11. Resistor
  • 100 Ohm
  •  1k ohm
  •  300 ohm - x3
  •  22k ohm
  •  470 ohm
  •  10k ohm
  •  150 ohm
  • Soldering Iron
  • Soldering Stand
  • Bread Board
  • Pliers
  • Cutter
  • Screw driver
  • Multi-tester
  • Power Source
  • PCB
  • Permanent Marker

Step 2: Testing the Circuit

This Step is the crucial step because you need to test the circuit before placing this into a PCB. You would be wasting your time if you place the circuit straight to the PCB once there is a problem. This step is just to test if the Circuit is working and once you transfer it to the PCB you would know that the problem would be in the PCB 

Step 3: After Breadboard Test (PCB Preparation)

If your circuit works in the breadboard make the PCB design.
  1. Cut it into size
  2. Draw the circuit boar design and then double check for shorted drawing.
  3. Etch the PCB in ferric Choride and watch the design come out
  4. Test the circuit using the ohmmeter (multi-tester)
  5. Drill the Necessary holes.
  • For better fitting of the components try to place them in their spot.
  • If you commit a mistake in drawing the design you can use a cutter to scrape the marker off
  • For your guide refer to the pictures

Step 4: Place in All Components and Solder Them

After having the holes drilled just place all the components where it should be and solder them.

Be careful for wrong placement of some components like wrong reading of Resistor, Wrong placement of Diode and such more.

The Mic also has its polarity.

Step 5: Do the Final Testing and Trouble Shoot

You are done and here you will test if your product works
  1. Use a multi-tester and check for shorted connection.
  2. if there is no shorted connection use a 9v battery and test.

  • Usual problems is due to the mic sensitivity and the mic. I suggest using a mic from a Used webcam or a mic used in a comp where in it hears in long distance
  • battery source may be the source of the problem as well since the 741 just compares the voltage that passes thru and  may change its sensitivity.
Project mounting
  • This project can be used in lamps or even inside the wall switch

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