daily_automated

trunk/Arduino/libraries/MD_LM335A/src/MD_LM335A.cpp

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+/*
+  MD_LM335A - Library for using a LM335A temperature sensor.
+  
+  Created by Marco Colli April 2012
+  - Does not need floating point library. Temperatures held in hundredths of degree (23C = 2300)
+  - Vcc parameter as LM335 is very sensitive to voltage level (nominal 5V)
+  
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include "MD_LM335A.h"
+
+int readVcc()
+// Calculate current Vcc in mV from the 1.1V reference voltage
+{
+#if defined(__AVR_ATMega168__) || defined(__AVR_ATMega328__)
+  long result = 5000;
+
+  // Read 1.1V reference against AVcc
+  ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
+  delay(2); 				// Wait for Vref to settle
+  ADCSRA |= _BV(ADSC); 		// Convert
+  while (bit_is_set(ADCSRA,ADSC));
+  result = ADCL;
+  result |= ADCH<<8;
+  result = 1126400L / result; // Back-calculate AVcc in mV
+  
+  return(result);
+#else
+  return(5000);
+#endif
+  }
+
+LM335A::LM335A(int pin)
+{
+  pinMode(pin, INPUT);
+  _pin = pin;
+  _Vcc = -1;
+}
+
+LM335A::LM335A(int pin, int Vcc)
+{
+  pinMode(pin, INPUT);
+  _pin = pin;
+  _Vcc = Vcc;
+}
+
+void LM335A::Read()
+{
+  if (_Vcc == -1)
+	_Vcc = readVcc()/10;
+  raw = analogRead(_pin);
+  dK = ((100L * raw * _Vcc) / 1024L); // convert 
+  dC = dK - 27315L;
+  dF = 3200L + (((long)dC * 9L)/5L);
+}

trunk/Arduino/libraries/MD_LM335A/src/MD_LM335A.h

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+/*
+  MD_LM335A - Library for using a LM335A temperature sensor.
+  
+  Created by Marco Colli April 2012
+  - Does not need floating point library. Temperatures held in hundredths of degree (23C = 2300)
+  - Vcc parameter as LM335 is very sensitive to voltage level (nominal 5V)
+  
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+ */
+#ifndef MD_LM335A_h
+#define MD_LM335A_h
+
+#include "Arduino.h"
+
+class LM335A
+{
+  public:
+    LM335A(int pin);
+    LM335A(int pin, int Vcc);
+    void Read(void);
+	long dF; 	// in 1/100 of degree (32k = 3200)
+	long dC;	// in 1/100 of degree
+	long dK;	// in 1/100 of degree
+	long raw;
+	
+  private:
+    int _pin;
+	int _Vcc; 	// in 1/100 V (5V = 500)
+};
+
+#endif
+