pxt-ev3/docs/tutorials/reflected-light-measure.md
Peli de Halleux 0251b914f2
color sensor examples (#894)
* tank zigzag

* reflected light measure

* adding links

* added reflected light calibration

* updated summary
2019-08-30 15:03:09 -07:00

29 lines
1.2 KiB
Markdown

# Reflected light measure
This example uses a color sensor to measure the reflected light on the dark and light surface
and set the light/dark thresholds.
```blocks
sensors.color3.onLightDetected(LightIntensityMode.Reflected, Light.Dark, function () {
brick.showString("dark", 2)
})
sensors.color3.onLightDetected(LightIntensityMode.Reflected, Light.Bright, function () {
brick.showString("bright", 2)
})
console.sendToScreen()
console.log("move color sensor")
console.log("over DARK color")
console.log("press ENTER when ready")
brick.buttonEnter.pauseUntil(ButtonEvent.Pressed)
sensors.color3.setThreshold(Light.Dark, sensors.color3.light(LightIntensityMode.Reflected) + 5)
console.logValue("dark", sensors.color3.threshold(Light.Dark))
console.log("move color sensor")
console.log("over BRIGHT color")
console.log("press ENTER when ready")
brick.buttonEnter.pauseUntil(ButtonEvent.Pressed)
sensors.color3.setThreshold(Light.Bright, sensors.color3.light(LightIntensityMode.Reflected) - 5)
console.logValue("bright", sensors.color3.threshold(Light.Bright))
forever(function () {
brick.showValue("reflected light", sensors.color3.light(LightIntensityMode.Reflected), 1)
})
```