pxt-ev3/docs/tutorials/reflected-light-calibration.md

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# Reflected light calibration
The ``calibrateLight`` blocks allows you to calibrate the reflected light of the color sensor in one block. Start the block and move the sensor over the dark and bright surface; then stop moving it.
```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 and BRIGHT color")
console.log("and stop moving when done")
console.log("press ENTER when ready")
brick.buttonEnter.pauseUntil(ButtonEvent.Pressed)
sensors.color3.calibrateLight(LightIntensityMode.Reflected)
brick.showValue("dark", sensors.color3.threshold(Light.Dark), 4)
brick.showValue("bright", sensors.color3.threshold(Light.Bright), 5)
forever(function () {
brick.showValue("reflected light", sensors.color3.light(LightIntensityMode.Reflected), 1)
})
```