maxsonarez: Initial implementation

The module supports the LV-MaxSonar EZ1, EZ2, EZ3 and EZ4 ultrasonic
range finders.  It was developed and tested on the EZ3 variant.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/c++/CMakeLists.txt

@@ -116,6 +116,7 @@ add_executable (grovewfs-example grovewfs.cxx)
 add_executable (isd1820-example isd1820.cxx)
 add_executable (sx6119-example sx6119.cxx)
 add_executable (si114x-example si114x.cxx)
+add_executable (maxsonarez-example maxsonarez.cxx)
 
 include_directories (${PROJECT_SOURCE_DIR}/src/hmc5883l)
 include_directories (${PROJECT_SOURCE_DIR}/src/grove)
@@ -210,6 +211,7 @@ include_directories (${PROJECT_SOURCE_DIR}/src/grovewfs)
 include_directories (${PROJECT_SOURCE_DIR}/src/isd1820)
 include_directories (${PROJECT_SOURCE_DIR}/src/sx6119)
 include_directories (${PROJECT_SOURCE_DIR}/src/si114x)
+include_directories (${PROJECT_SOURCE_DIR}/src/maxsonarez)
 
 target_link_libraries (hmc5883l-example hmc5883l ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (groveled-example grove ${CMAKE_THREAD_LIBS_INIT})
@@ -327,3 +329,4 @@ target_link_libraries (grovewfs-example grovewfs ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (isd1820-example isd1820 ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (sx6119-example sx6119 ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (si114x-example si114x ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries (maxsonarez-example maxsonarez ${CMAKE_THREAD_LIBS_INIT})

examples/c++/maxsonarez.cxx

@@ -0,0 +1,72 @@
+/*
+ * 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 "maxsonarez.h"
+
+using namespace std;
+
+bool shouldRun = true;
+
+#define MAXSONAREZ_AREF   5.0
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+int main()
+{
+  signal(SIGINT, sig_handler);
+
+//! [Interesting]
+
+  // Instantiate a MaxSonarEZ on analog pin A1, with an analog
+  // reference voltage of MAXSONAREZ_AREF
+  upm::MAXSONAREZ *sonar = new upm::MAXSONAREZ(1, MAXSONAREZ_AREF);
+  
+  // Every second, sample the sonar and output the distance to an
+  // object in inches.
+
+  // With the EZ3 version, the minimum and maximum ranges seemed to be
+  // between 6 and 33 inches
+
+  while (shouldRun)
+    {
+      cout << "AREF: " << MAXSONAREZ_AREF 
+           << ", distance in inches: " << sonar->inches() << endl;
+      
+      sleep(1);
+    }
+
+//! [Interesting]
+
+  cout << "Exiting" << endl;
+
+  delete sonar;
+  return 0;
+}