Merge pull request joeycastillo#27 from DinkleMinded/patch-1

Add instructions for simulator build

content/en/docs/movement/emulator.md

@@ -3,4 +3,21 @@ title: "Building Firmware for the Sensor Watch Emulator"
 linkTitle: "Building Firmware for the Sensor Watch Emulator"
 weight: 40
 ---
-TODO
+
+Install the Emscriptem (WASM) cross-compiling toolchain on Linux
+----------------------------------------------------------------
+
+* Debian/Ubuntu: `apt install emscripten`
+
+Compile firmware
+----------------
+
+* From within the [repo](https://github.com/joeycastillo/Sensor-Watch):
+* edit make_alternate_fw.sh to select which build(s) you want
+* `cd movement/make`
+* `./make_alternate_fw.sh`
+
+The built firmware will be at `movement/make/firmware/simulate/standard`. You can now run this firmware in your browser with `emrun`:
+
+* `cd movement/make/firmware/simulate/standard`
+* `emrun index.html`