The Whistled - A Sound Controlled Relay

It’s interesting to hack one of your appliances or lighting projects into a whistle controlled intelligent one. The whistled allows you to do so by simply whistling two musical notes. To set it up, you just need to connect your 5.5/2.1mm DC connector on one end and your load on the other.

 

To grab a sense of how it actually works, check out the presentation video below:

 

 

 

 

• ESD protected PCB, covered in transparent heat shrinkable tubing
• Voltage must be between 4.5 and 18V at the input (barrel connector)
• Reversed polarity protection
• Max current of 5A
• 16 bits PWM output
• SWD pads for programming
• Listening range of 15m / 50feet
• Cortex M4 microcontroller performing 80 FFTs / sec
• Maximum voltage on the screw terminals is 25 Volts (don't forget the flyback diode!)