Anyone knows how to convert a ADC reading into real Degrees for temperature? On the Manual, it's said like following:
The mote’s ADC output can be converted to degrees Kelvin using the following approximation over 0-50 °C: 1/T(K) = a + b × ln(Rthr) + c × [ln(Rthr)]3 where: Rthr = R1(ADC_FS-ADC)/ADC a = 0.00130705 b = 0.000214381 Page 10 Doc. # 7430-0020-03 Rev. B MTS/MDA Sensor Board User’s Manual Wireless Sensor Networks c = 0.000000093 R1 = 10 kΩ ADC_FS = 1023 ADC = output value from mote’s ADC measurement. BUT I always got readings like between 500-600. And when I using the function above, I got some really weird numbers after calculation. double a = 0.00130705; double b = 0.000214381; double c = 0.000000093; double r1 = 10; double adc_fs = 1023; double adc = 600; double rthr = (r1 * (adc_fs - adc))/adc; double temp = Math.log10(rthr); double temp1=Math.pow(temp, 3); double temp3=a+b*temp+c*temp1; System.out.println(1/temp3); RESULT: 671.6176617203942
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