color sensor examples (#894)

* tank zigzag

* reflected light measure

* adding links

* added reflected light calibration

* updated summary

docs/SUMMARY.md

@@ -19,11 +19,14 @@
     * [What Animal Am I?](/tutorials/what-animal-am-i)
     * [Music Brick](/tutorials/music-brick)
     * [Run Motors](/tutorials/run-motors)
+    * [Tank ZigZag](/tutorials/tank-zigzag)
     * [Touch to Run](/tutorials/touch-to-run)
     * [Touch Sensor Values](/tutorials/touch-sensor-values)
     * [What Color?](/tutorials/what-color)
     * [Line Following](/tutorials/line-following)
     * [Red Light, Green Light](/tutorials/redlight-greenlight)
+    * [Reflected Light Measure](/tutorials/reflected-light-measure)
+    * [Reflected Light Calibration](/tutorials/reflected-light-calibration)
     * [Object Near?](/tutorials/object-near)
     * [Security Alert](/tutorials/security-alert)
 

docs/tutorials/color-sensor.md

@@ -21,6 +21,18 @@
   "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"
 }]
 ```
 

docs/tutorials/motors.md

@@ -9,6 +9,12 @@
   "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"
 }]
 ```
 

docs/tutorials/reflected-light-calibration.md

@@ -0,0 +1,24 @@
+# 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)
+})
+```

docs/tutorials/reflected-light-measure.md

@@ -0,0 +1,29 @@
+# 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)
+})
+```

docs/tutorials/tank-zigzag.md

@@ -0,0 +1,17 @@
+# 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)
+})
+```