Kolm Silma

“Kolm silma” is an electronic sculpture with three eyes (RGB LEDs). It changes LEDs’ colours when it detects movements.


  • MCU: Selfmade Arduino Uno
  • RGB LED: W2812 NeoPixels x 3pc.
  • Sensor: RCWL-0516 Microwave Proximity


  • RSWL-0516 is a microwave proximity sensor.
  • Operates on 4-28V.
  • Built in 3.3V voltage regulator.
  • Works at 3.18GHz.
  • Uses droppler radar to detect motion.
3V33.3V Output
OUTDigital output
VIN4-28V Power input
CDSOptional light sensor

Doppler Effect

  • Discovered in 1842 by Christian Doppler.
  • Change in frequency observed when source is moving.
  • Applies to all waves: light, sound, radio and water waves.
  • Astronomy – red or blue shifting of light from distant object.
  • Satellite communications -used dynamic doppler compensation.
  • Medical -echocardiogram measures blood flow.


Code on github.com/taunoe/Kolm_silma.


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