From 3b6cfed5b2f0fe27adf7280791bb177433dee887 Mon Sep 17 00:00:00 2001
From: Peli de Halleux <pelikhan@users.noreply.github.com>
Date: Thu, 15 Feb 2018 13:56:50 -0800
Subject: [PATCH] added distance measurer

---
 docs/examples.md                   |  5 +++++
 docs/examples/distance-measurer.md | 34 ++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 docs/examples/distance-measurer.md

diff --git a/docs/examples.md b/docs/examples.md
index a9f6cc3b..7420911b 100644
--- a/docs/examples.md
+++ b/docs/examples.md
@@ -212,5 +212,10 @@ Here are some fun programs for your @boardname@!
   "description": "Keep your brick entertained and happy",
   "url":"/examples/happy-unhappy",
   "cardType": "example"
+}, {
+  "name": "Distance Measurer",
+  "description": "Use a motor to measure angle and distance",
+  "url": "/examples/distance-measurer",
+  "cardType": "example"
 }]
 ```
\ No newline at end of file
diff --git a/docs/examples/distance-measurer.md b/docs/examples/distance-measurer.md
new file mode 100644
index 00000000..51157902
--- /dev/null
+++ b/docs/examples/distance-measurer.md
@@ -0,0 +1,34 @@
+# Distance Measurer
+
+```blocks
+let distance = 0
+let angle = 0
+let measuring = false
+let radius = 0
+// Start and stop measuring with the enter button
+brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
+    if (measuring) {
+        // turn off the measuring
+        measuring = false
+        brick.setStatusLight(StatusLight.Off)
+    } else {
+        // turn on the measuring clear the counters so that
+        // the motor tracks the angle
+        measuring = true
+        motors.largeB.clearCounts()
+        brick.setStatusLight(StatusLight.GreenPulse)
+    }
+})
+radius = 2.5
+brick.showString("Press ENTER to measure", 4)
+forever(function () {
+    if (measuring) {
+        angle = motors.largeB.angle()
+        distance = angle / 180 * Math.PI * radius
+        brick.clearScreen()
+        brick.showValue("angle", angle, 2)
+        brick.showValue("distance", distance, 3)
+    }
+    pause(100)
+})
+```
\ No newline at end of file