color sensor examples (#894)

* tank zigzag

* reflected light measure

* adding links

* added reflected light calibration

* updated summary
This commit is contained in:
Peli de Halleux
2019-08-30 15:03:09 -07:00
committed by GitHub
parent 1fc818767c
commit 0251b914f2
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"cardType": "tutorial",
"url":"/tutorials/redlight-greenlight",
"imageUrl":"/static/tutorials/redlight-greenlight.png"
}, {
"name": "Reflected Light Measure",
"description": "Teach the sensor what light or dark is.",
"cardType": "example",
"url":"/tutorials/reflected-light-measure",
"imageUrl":"/static/tutorials/reflected-light-measure.png"
}, {
"name": "Reflected Light Calibration",
"description": "Use the auto-calibration feature to setup the dark and bright values.",
"cardType": "example",
"url":"/tutorials/reflected-light-calibration",
"imageUrl":"/static/tutorials/reflected-light-calibration.png"
}]
```

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"cardType": "tutorial",
"url":"/tutorials/run-motors",
"imageUrl":"/static/tutorials/run-motors.png"
}, {
"name": "Tank ZigZag",
"description": "Use the tank block to keep motors in sync.",
"cardType": "example",
"url":"/tutorials/tank-zigzag",
"imageUrl":"/static/tutorials/tank-zigzag.png"
}]
```

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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)
})
```

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# 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)
})
```

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# Tank ZigZag
This example shows how to use the [tank](/reference/motors/tank) block to keep the speed of 2 large motors synchronized. In this example, a [EV3 Driving Base](https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-rem-driving-base-79bebfc16bd491186ea9c9069842155e.pdf)
) will move on a zig zag pattern.
```blocks
/**
* Use the tank block to keep large motors synched.
Use this code with a EV3 driving base.
*/
forever(function () {
brick.showImage(images.eyesMiddleRight)
motors.largeBC.tank(50, 10, 2, MoveUnit.Rotations)
brick.showImage(images.eyesMiddleLeft)
motors.largeBC.tank(10, 50, 2, MoveUnit.Rotations)
})
```