Sunday, May 19, 2024

Automatic Contactless Switch For Smart Home

ashwiniWith increased technological advancements, switches require updating with current times. To avoid the risk of contracting COVID-19, it has become important to not touch surfaces of buttons and keys that have been frequently used by other people. This calls for a need to innovate the switching technology for replacing a hand-operated switch, with an automatic contactless switch.

So today, we will design a no-touch switch that works entirely on hand gestures. Our smart contactless switch includes a sensor that is capable of detecting hand movements and translates them into commands for controlling lights, fans and various home appliances.

Bill of Materials

Let’s start designing the smart switch by shopping for the following components.


First of all we need to install the required library in the Arduino IDE. Go to Select → Library Manager → Search APDS9960 → Install Adafruit APDS9960 

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Installing Library
Fig 2. Installing library

After installing the library, add it into the code and then define the pin number for light and fan control. Next, create a setup function where you can initialise the sensor and set the pinmode output for light and fan control. 

Fig 3.Coding
Fig 4.Setup function

Then create a loop function to update the sensor readings and use your hand gestures as an input to control the pin. Also create a few if conditions for specifying the commands based on the type of hand gestures (up, down, left and right). 

Up: Lights ON 

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Down: Lights OFF 

Left: Fans ON

Right: Fans OFF

Fig 5. Loop function


Now upload the code to Arduino and connect the components as described in the circuit diagram. Then connect the AC wire with the common pin of relay module to control the lights and fans.

Connection for Automatic Contactless Switch For Smart Home
Fig 6.Connection for Automatic Contactless Switch For Smart Home
Fig 7. Connection inside board

Testing for the Contactless Switch

Now power the device and relay. When you will move your hand in an upward direction, the relay will be moved and lights will switch ON. Similarly, a hand gesture in downward direction will switch OFF the lights. 

Download Source Without OLED Code

Download Source With OLED Code

Ashwini Sinha
Ashwini Sinha
A tech journalist at EFY, with hands-on expertise in electronics DIY. He has an extraordinary passion for AI, IoT, and electronics. Holder of two design records and two times winner of US-China Makers Award.


  1. Good Project. Thanks for sharing. Please share the circuit diagram and the details how you powered Arduino inside switch board. How you got 5V DC to power Arduino inside switch board.

    I could see a display which shows Arrow in the video but it is not in the bill of materials.

    • There are two versions of CODE attached with the article one is simple other with OLED. The article is about a simplified version of a switch without OLED to reduce the overall cost of the project and to reduce the construction time. If anyone wants to expend extra money then he can add OLED and the code is attached with the article. The connection with OLED is the same as both are I2C based devices.

  2. Bro give us the circuit diagram and the connection with main board this way it is not possible to the the project … You are not sharing the main things…. As a bigginer to this field I m interested with your idea…. But your resources are stucking me… Kindly share us the connections properly if possible and source code is not downlable and… If possible make a video how you made it…. Demo it’s fine… But make a connection video…. And thank u for your so much support

    • The relay module has 3 pins NO (Normally OPEN) COM (Common). Put the live wire in COM pin and bulb live wire to NO Pin and Connect Netural wire of circuit board outlet to netural wire of bulb. be carefull cut off the power wire connection. .You can contact me on what’s app 761350809 if you have further confusion regarding AC connection (Be careful do all connection right way and cross-check AC shock and Short circuit is dangerous)


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