Temp_datalogging.txt

/*Temperature Sensing/Datalogging with the TMP36 */

#include <FileIO.h>

int tempPin = A0; //Reading from analog pin 0

void setup() 
{  
pinMode(tempPin,INPUT); //Setting analog pin to Input  
Bridge.begin();
FileSystem.begin();
Serial.begin(9600);//Starting communication with serial monitor at baud rate 9600
while(!Serial);
}

void loop() 
{
  String dataString;
  dataString += getTimeStamp();
  dataString += " = ";
  float TempF = tempRead();
  dataString += String(TempF);
  
  File dataFile = FileSystem.open("/mnt/sd/datalog.txt", FILE_APPEND);
  
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
  }
  else {
    Serial.println("error opening datalog.txt");
}

delay(10000);
}





float tempRead() 
{
float reading = analogRead(tempPin); //1-Taking in values through the A/D converter from 0 to 1023 
  float voltage = reading*(5.0/1024.0); //2-Multiplying reading by voltage step size to get voltage
  float TempC = (voltage*100.0)-50.0; //3-Plugging voltage into sensor-specific formula to get temperature in degrees Celsius 
  float TempF = (1.8*TempC)+32.0; //4-Converting degrees Celsius to Fahrenheit
 return TempF;
  
}


String getTimeStamp() {
  String result;
  Process time;
  // date is a command line utility to get the date and the time
  // in different formats depending on the additional parameter
  time.begin("date");
  time.addParameter("+%D-%T");  // parameters: D for the complete date mm/dd/yy
  //             T for the time hh:mm:ss
  time.run();  // run the command

  // read the output of the command
  while (time.available() > 0) {
    char c = time.read();
    if (c != '\n')
      result += c;
  }

  return result;
}