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Posted By

jatkins on 11/16/09


Tagged

decimal longitude temperature GPS latitude coordinates Degrees arduino nmea Sensor Sensors Geography thermometer onewire one-wire 1-wire 1wire


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ARDUINO: Telemetry parser

 / Published in: Processing
 
  • Temperature sensors are programmed to operate in external power mode (not parasite power)\r\n* Libraries required: OneWire and DallasTemperature\r\n* The GPS parser was programmed purely by myself; the temperature sensing code is derived from the sample code for the DallasTemperature library, which is licensed under the LGPL
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  1. #include <OneWire.h>
  2. #include <DallasTemperature.h>
  3. #include <string.h>
  4. OneWire therm1(8);
  5. OneWire therm2(10);
  6. DallasTemperature sensor_inside(&therm1);
  7. DallasTemperature sensor_outside(&therm2);
  8. char incomingByte, nmea[71], final_lat[9], final_lon[11], final_time[10], final_alt[9], msg[70], arrayItem[15][20], itemCount, temp_inside[10], temp_outside[10];
  9. int currentCharIndex = 0, readingLine = 0, i, n_or_s, e_or_w, count = 0, z, indexAfterDelimiter;
  10. double lat, lon, lat_minutes, lon_minutes;
  11.  
  12. void setup() {
  13.   // START: temperature sensor initialization code
  14.   sensor_inside.begin();
  15.   sensor_outside.begin();
  16.   // END: temperature sensor initialization code
  17.   // Output format: Time(UTC),Latitude(Decimal Degs),Longitude,# of Satellites in view,Altitude(km),Other Alt,Temperature inside (C), Temperature outside (C)
  18.     Serial.begin(4800);
  19. }
  20.  
  21. void split() {
  22.   itemCount = 0;
  23.   for(i=0;i<strlen(nmea);i++) {
  24.     if(nmea[i]!=',') {
  25.       arrayItem[itemCount][indexAfterDelimiter] = nmea[i];
  26.       indexAfterDelimiter++;
  27.     }
  28.     else {
  29.       indexAfterDelimiter = 0;
  30.       itemCount++;
  31.     }
  32.   }
  33. }
  34.  
  35. double get_from_arrayItem(int item_index, int start_index, int end_index) {
  36.   char retrieved[end_index-start_index];
  37.   for(int i=0;i<=end_index-start_index;i++) {
  38.     retrieved[i] = arrayItem[item_index][start_index+i];
  39.   }
  40.   return atof(retrieved);
  41. }
  42.  
  43. void loop() {
  44.   if(Serial.available()) {
  45.     incomingByte = Serial.read();
  46.     if(incomingByte=='$') { // start of line
  47.       readingLine = 1;
  48.     }
  49.     else if(incomingByte=='*') { // end of useful data
  50.       readingLine = 0;
  51.       if(nmea[3]=='G'&&nmea[4]=='G'&&nmea[5]=='A') { // check if line starts with $GPGGA
  52.         sensor_inside.requestTemperatures();
  53.         sensor_outside.requestTemperatures();
  54.         split();
  55.         lat         = get_from_arrayItem(2, 0, 1);
  56.         lat_minutes = get_from_arrayItem(2, 2, strlen(arrayItem[2])-1);
  57.         lon         = get_from_arrayItem(4, 0, 1);
  58.         lon_minutes = get_from_arrayItem(4, 2, strlen(arrayItem[4])-1);
  59.         for(i=0;i<=sizeof(msg);i++) {
  60.           msg[i] = 0;
  61.         }
  62.         for(i=0;i<10;i++) {
  63.           final_time[i] = arrayItem[1][i];
  64.         }
  65.         for(i=0;i<=sizeof(temp_inside);i++) {
  66.           temp_inside[i] = 0;
  67.         }
  68.         for(i=0;i<=sizeof(temp_outside);i++) {
  69.           temp_outside[i] = 0;
  70.         }
  71.         dtostrf((lat+lat_minutes/60), 9, 7, final_lat);
  72.         final_alt[7] = 0; // clear
  73.         final_alt[8] = 0; // final_alt's
  74.         final_alt[9] = 0; // undefined keys
  75.         strlcat(msg, final_time, sizeof(msg));
  76.         strlcat(msg, ",", sizeof(msg));
  77.         strlcat(msg, arrayItem[3][0]=='S'?"-":"+", sizeof(msg));
  78.         strlcat(msg, final_lat, sizeof(msg));
  79.         strlcat(msg, ",", sizeof(msg));
  80.         strlcat(msg, arrayItem[5][0]=='W'?"-":"+", sizeof(msg));
  81.         dtostrf((lon+lon_minutes/60), 9, 7, final_lon);
  82.         strlcat(msg, final_lon, sizeof(msg));
  83.         strlcat(msg, ",", sizeof(msg));
  84.         strlcat(msg, arrayItem[7], sizeof(msg));
  85.         strlcat(msg, ",", sizeof(msg));
  86.         dtostrf((atof(arrayItem[9])/1000), 6, 3, final_alt);
  87.         strlcat(msg, final_alt, sizeof(msg));
  88.         strlcat(msg, ",", sizeof(msg));
  89.         strlcat(msg, arrayItem[11], sizeof(msg));
  90.         strlcat(msg, ",", sizeof(msg));
  91.         dtostrf(sensor_inside.getTempCByIndex(0), 5, 2, temp_inside);
  92.         strlcat(msg, temp_inside, sizeof(msg));
  93.         strlcat(msg, ",", sizeof(msg));
  94.         dtostrf(sensor_outside.getTempCByIndex(0), 5, 2, temp_outside);
  95.         strlcat(msg, temp_outside, sizeof(msg));
  96.         strlcat(msg, ",", sizeof(msg));
  97.         Serial.println(msg);
  98.       }
  99.       for(i=0;i<71;i++) {
  100.         nmea[i] = 0;
  101.       }
  102.       currentCharIndex = 0;
  103.     }
  104.     if(readingLine==1) {
  105.       nmea[currentCharIndex] = incomingByte;
  106.       currentCharIndex++;
  107.     }
  108.   }
  109. }

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