“Kolm silma” is an electronic sculpture with three eyes (RGB LEDs). It changes LEDs’ colours when it detects movements.
Hardware
- MCU: Selfmade Arduino Uno
- RGB LED: W2812 NeoPixels x 3pc.
- Sensor: RCWL-0516 Microwave Proximity
RCWL-0516
- 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.
| pin | comment |
|---|---|
| 3V3 | 3.3V Output |
| GND | Ground |
| OUT | Digital output |
| VIN | 4-28V Power input |
| CDS | Optional 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.
Software
Code on github.com/taunoe/Kolm_silma.
Tauno Erik 