Add example for Engduino boards // Resolve #76

examples/atmelavr-and-arduino/arduino-engduino-library/README.rst

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+How to buid PlatformIO based project
+====================================
+
+1. `Install PlatformIO <http://docs.platformio.org/en/latest/installation.html>`_
+2. Download `source code with examples <https://github.com/ivankravets/platformio/archive/develop.zip>`_
+3. Extract ZIP archive
+4. Run these commands:
+
+.. code-block:: bash
+
+    # Change directory to example
+    > cd platformio-develop/examples/atmelavr-and-arduino/ardiono-engduino-library
+
+    # Process example project
+    > platformio run
+
+    # Upload firmware
+    > platformio run --target upload
+
+    # Clean build files
+    > platformio run --target clean

examples/atmelavr-and-arduino/arduino-engduino-library/platformio.ini

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+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:engduinov3]
+platform = atmelavr
+framework = arduino
+board = engduinov3

examples/atmelavr-and-arduino/arduino-engduino-library/src/src.pde

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+#include <EngduinoLEDs.h>
+#include <EngduinoAccelerometer.h>
+#include <Wire.h>
+
+// Accelerometer demo - level
+//
+// Show a red LED on one side if we're low on that side
+// show nothing if we're high, and show green on both sides
+// if it's level(ish)
+//
+// We delay between readings because it's a bit flashy
+// otherwise - too hard to hold steady
+//
+
+void setup()
+{
+  EngduinoLEDs.begin();
+  EngduinoAccelerometer.begin();
+}
+
+void loop()
+{ float xyz[3];
+
+  // Read the acceleration
+  //
+  EngduinoAccelerometer.xyz(xyz);
+  
+  // And light the appropriate LEDs depending on whether we're level
+  // or not. The LEDs chosen are on opposite sides of the board.
+  //
+  if ((xyz[0] > 0 && xyz[0] < 0.02) || (xyz[0] < 0 && xyz[0] > -0.02)) {
+    EngduinoLEDs.setLED(12, GREEN);
+    EngduinoLEDs.setLED( 4, GREEN);
+  }
+  else if (xyz[0] > 0.02) {
+    EngduinoLEDs.setLED(12, RED);
+    EngduinoLEDs.setLED( 4, OFF);    
+  }
+  else {
+    EngduinoLEDs.setLED(12, OFF);
+    EngduinoLEDs.setLED( 4, RED);
+  }
+  
+  if ((xyz[1] > 0 && xyz[1] < 0.02) || (xyz[1] < 0 && xyz[1] > -0.02)) {
+    EngduinoLEDs.setLED( 9, GREEN);
+    EngduinoLEDs.setLED(15, GREEN);
+  }
+  else if (xyz[1] > 0.02) {
+    EngduinoLEDs.setLED( 9, RED);
+    EngduinoLEDs.setLED(15, OFF);    
+  }
+  else {
+    EngduinoLEDs.setLED( 9, OFF);
+    EngduinoLEDs.setLED(15, RED);
+  }
+  
+  // Wait 50ms, then loop
+  //
+  delay(50);
+}