first commit

TEMP_NTC_100K/TEMP_NTC_100K.ino

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+#define THERMISTOR_PIN 0
+// r0: 100000
+// t0: 25
+// r1: 0
+// r2: 4700
+// beta: 4092
+// max adc: 1023
+
+//https://learn.adafruit.com/thermistor/using-a-thermistor
+//https://github.com/miguel5612/Arduino-ThermistorLibrary
+
+//Use a basic example.
+//Connect the termistor to GND and A0 pin.
+//Connect a 4k7 resistor series to VCC.
+//Connect a 10Uf into A0 to GND.
+//And Have fun, the library works
+
+#define NUMTEMPS 20
+short temptable[NUMTEMPS][2] = {
+   {1, 821},
+   {54, 252},
+   {107, 207},
+   {160, 182},
+   {213, 165},
+   {266, 152},
+   {319, 141},
+   {372, 131},
+   {425, 123},
+   {478, 115},
+   {531, 107},
+   {584, 100},
+   {637, 93},
+   {690, 86},
+   {743, 78},
+   {796, 70},
+   {849, 60},
+   {902, 49},
+   {955, 34},
+   {1008, 3}
+};
+void setup()
+{
+   Serial.begin(9600);
+   Serial.println("Starting temperature exerciser.");
+}
+
+void loop()
+{
+   int rawvalue = analogRead(THERMISTOR_PIN);
+   int celsius = read_temp();
+   int fahrenheit = (((celsius * 9) / 5) + 32);
+
+   Serial.print("Current temp: ");
+   Serial.print(celsius);
+   Serial.print("C / ");
+   Serial.print(fahrenheit);
+   Serial.println("F");
+   
+   Serial.print("Raw value: ");
+   Serial.println(rawvalue);
+   Serial.println(" ");
+
+   delay(1000);
+}
+
+int read_temp()
+{
+   int rawtemp = analogRead(THERMISTOR_PIN);
+   int current_celsius = 0;
+
+   byte i;
+   for (i=1; i<NUMTEMPS; i++)
+   {
+      if (temptable[i][0] > rawtemp)
+      {
+         int realtemp  = temptable[i-1][1] + (rawtemp - temptable[i-1][0]) * (temptable[i][1] - temptable[i-1][1]) / (temptable[i][0] - temptable[i-1][0]);
+
+         if (realtemp > 255)
+            realtemp = 255;
+
+         current_celsius = realtemp;
+
+         break;
+      }
+   }
+
+   // Overflow: We just clamp to 0 degrees celsius
+   if (i == NUMTEMPS)
+   current_celsius = 0;
+
+   return current_celsius;
+}