mg811: Initial implementation

This driver was developed on a DFRobot CO2 sensor based on the MG811:
http://www.dfrobot.com/index.php?route=product/product&product_id=1023

It seems to *require* very precise calibration at 400ppm and 1000ppm
to be accurate.  It also gets pretty hot (due to the heater) and
consumes significant current.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: sisinty sasmita patra <sisinty.s.patra@intel.com>

examples/c++/CMakeLists.txt

@@ -134,6 +134,7 @@ add_executable (ak8975-example ak8975.cxx)
 add_executable (lsm9ds0-example lsm9ds0.cxx)
 add_executable (eboled-example eboled.cxx)
 add_executable (hyld9767-example hyld9767.cxx)
+add_executable (mg811-example mg811.cxx)
 
 include_directories (${PROJECT_SOURCE_DIR}/src/hmc5883l)
 include_directories (${PROJECT_SOURCE_DIR}/src/grove)
@@ -241,6 +242,7 @@ include_directories (${PROJECT_SOURCE_DIR}/src/hp20x)
 include_directories (${PROJECT_SOURCE_DIR}/src/pn532)
 include_directories (${PROJECT_SOURCE_DIR}/src/lsm9ds0)
 include_directories (${PROJECT_SOURCE_DIR}/src/hyld9767)
+include_directories (${PROJECT_SOURCE_DIR}/src/mg811)
 
 target_link_libraries (hmc5883l-example hmc5883l ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (groveled-example grove ${CMAKE_THREAD_LIBS_INIT})
@@ -376,3 +378,4 @@ target_link_libraries (ak8975-example mpu9150 ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (lsm9ds0-example lsm9ds0 ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (eboled-example i2clcd ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (hyld9767-example hyld9767 ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries (mg811-example mg811 ${CMAKE_THREAD_LIBS_INIT})

examples/c++/mg811.cxx

@@ -0,0 +1,68 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <iostream>
+#include <signal.h>
+#include "mg811.h"
+
+using namespace std;
+
+bool shouldRun = true;
+
+#define MG811_AREF   5.0
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+int main()
+{
+  signal(SIGINT, sig_handler);
+
+//! [Interesting]
+
+  // Instantiate an MG811 on analog pin A0, and digital pin D2 with an
+  // analog reference voltage of MG811_AREF (5.0)
+  upm::MG811 *sensor = new upm::MG811(0, 2, MG811_AREF);
+  
+  // Every tenth of a second, sample the sensor and output it's
+  // detected CO2 concentration in parts per million (ppm)
+
+  while (shouldRun)
+    {
+      cout << "CO2 concentration in PPM: " << sensor->ppm() << endl;
+      
+      usleep(100000);
+    }
+
+//! [Interesting]
+
+  cout << "Exiting" << endl;
+
+  delete sensor;
+  return 0;
+}

examples/javascript/mg811.js

@@ -0,0 +1,53 @@
+/*jslint node:true, vars:true, bitwise:true, unparam:true */
+/*jshint unused:true */
+
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+var sensorObj = require('jsupm_mg811');
+
+// Instantiate an MG811 on analog pin A0, and digital pin D2 with an
+// analog reference voltage of MG811_AREF (5.0)
+
+var sensor = new sensorObj.MG811(0, 2, 5.0);
+
+// Every tenth of a second, sample the sensor and output it's
+// detected CO2 concentration in parts per million (ppm)
+
+setInterval(function()
+{
+    console.log("CO2 concentration in PPM: " + sensor.ppm());
+}, 100);
+
+// exit on ^C
+process.on('SIGINT', function()
+{
+    sensor = null;
+    sensorObj.cleanUp();
+    sensorObj = null;
+    console.log("Exiting.");
+    process.exit(0);
+});
+

examples/python/mg811.py

@@ -0,0 +1,51 @@
+#!/usr/bin/python
+# Author: Jon Trulson <jtrulson@ics.com>
+# Copyright (c) 2015 Intel Corporation.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import time, sys, signal, atexit
+import pyupm_mg811 as sensorObj
+
+# Instantiate an MG811 on analog pin A0, and digital pin D2 with an
+# analog reference voltage of MG811_AREF (5.0)
+
+sensor = sensorObj.MG811(0, 2, 5.0)
+
+## Exit handlers ##
+# This function stops python from printing a stacktrace when you hit control-C
+def SIGINTHandler(signum, frame):
+	raise SystemExit
+
+# This function lets you run code on exit
+def exitHandler():
+	print "Exiting"
+	sys.exit(0)
+
+# Register exit handlers
+atexit.register(exitHandler)
+signal.signal(signal.SIGINT, SIGINTHandler)
+
+# Every tenth of a second, sample the sensor and output it's
+# detected CO2 concentration in parts per million (ppm)
+
+while (1):
+        print "CO2 concentration in PPM: ", sensor.ppm()
+	time.sleep(.1)