Knock Sensor Module KY-031 as a toggle switch with Arduino

Knock Sensor Module KY-031 as a toggle switch with Arduino. The code will work with any arduino version. Knock Sensor is used to give input to the arduino. All you got to do is :-

1. Assemble all the parts by following the schematics.
2. Flash the code to arduino
3. Connect Knock Sensor Module KY-031.
4. Connect Relay.
5. Run the program.

Note : Change initial state of Input accordingly.

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how do you add Knock sensor int the frtizing?