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TMP36

+#define aref_voltage 3.3        
+ 
+
+int tempPin = A1;       
+int tempReading;       
+ 
+void setup(void) {
+  
+  Serial.begin(9600);   
+ 
+  
+  analogReference(EXTERNAL);
+}
+ 
+ 
+void loop(void) {
+ 
+  tempReading = analogRead(tempPin);  
+ 
+  Serial.print("Temp reading = ");
+  Serial.print(tempReading);
+ 
+  
+  float voltage = tempReading * aref_voltage;
+  voltage /= 1024.0; 
+ 
+  
+  Serial.print(" - ");
+  Serial.print(voltage); Serial.println(" volts");
+ 
+  
+  float temperatureC = (voltage - 0.5) * 100 ;  
+  degrees ((volatge - 500mV) times 100)
+  Serial.print(temperatureC); Serial.println(" degrees C");
+   
+ 
+  delay(1000);
+}
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