Hello, fellow launchpad enthusiasts!
I am having problems reading temperature sensor values on my stellaris launchpad (LM4F120H5QR). The values returned by analogRead(TEMPSENSOR) are erratic and do not correlate with actual temperature. I use ubuntu 14.04 and energia 0101E0014. I tried following code:
uint32_t TempRead = 0;
float TempC = 0;
void setup()
{
Serial.begin(9600);
analogRead(TEMPSENSOR);
}
void loop()
{
TempRead = analogRead(TEMPSENSOR);
TempC = (float)(1475 - ((2475*TempRead)/4096))/10;
Serial.print("ADC value: ");
Serial.println(TempRead);
Serial.print("Temperature in C: ");
Serial.println(TempC);
Serial.println("------------------------");
delay(1000);
}While runnning this code and putting my finger on MCU this code gives:
ADC value: 1939 Temperature in C: 32.40 ------------------------ ADC value: 1871 Temperature in C: 34.50 ------------------------ ADC value: 1899 Temperature in C: 32.80 ------------------------ ADC value: 1895 Temperature in C: 33.00 ------------------------ ADC value: 1895 Temperature in C: 33.00 ------------------------ ADC value: 1899 Temperature in C: 32.80 ------------------------ ADC value: 1899 Temperature in C: 32.80 ------------------------ ADC value: 1895 Temperature in C: 33.00 ------------------------ ADC value: 1899 Temperature in C: 32.80 ------------------------ ADC value: 1899 Temperature in C: 32.80 ------------------------ ADC value: 1895 Temperature in C: 33.00 ------------------------ ADC value: 1899 Temperature in C: 32.80
Basicaly no changes in reading, apart from random-like stuttering. Anyone have an idea what could be the problem here?
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