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Post: Thank you so much Brian and Andrew. I was struggling with my PT 100 , perhaps due to collective error of voltage drop and error due to variation in the resistance of devider circuit I was getting an error of 5 degrees F.finally my sensors are giving accurate readings code is following:-#!/usr/bin/python3 from ABE_ExpanderPi import ADCimport timeimport math"""===============================================Success_read_PT100-1.0=============================================== this demo reads the voltage from channel 1 on the ADC inputs"""from math import sqrt as sqrtadc = ADC() # create an instance of the ADC # set the reference voltage. this should be set to the exact voltage# measured on the Expander Pi Vref pin.adc.set_adc_refvoltage(3.5)alpha = 0.003851a = 0.0039083b = -0.0000005775 c = -0.000000000004183ro = 100vs = 3.5r1 = 270D1 = adc.read_adc_voltage(1)D2 = adc.read_adc_voltage(2)D3 = adc.read_adc_voltage(3)D4 = adc.read_adc_voltage(4)D5 = adc.read_adc_voltage(5)D6 = adc.read_adc_voltage(6)D7 = adc.read_adc_voltage(7)D8 = adc.read_adc_voltage(8)def getTemp(voltage): voltage = adc.read_adc_voltage(voltage) Z = (r1/((vs/voltage-1))) X = a*a*ro*ro-4*ro*b*(ro-Z) Y = math.sqrt(X) T = ((-(a*ro)+Y)/(2*b*ro))*(9/5)+32-5 return T def tempAvg(voltage): temperature = getTemp(voltage) time.sleep(1) temperature += getTemp(voltage) time.sleep(1) temperature += getTemp(voltage) time.sleep(1) temperature += getTemp(voltage) time.sleep(1) temperature += getTemp(voltage) temperature = temperature/5 print(temperature)#def getTemperature(voltage):#temperature = (((a*ro*-1)+math.sqrt(((ro*ro*a*a)-4*ro*b*(ro-(r1/((vs/voltage)-1)))))/(2*b*ro)))*(9/5)+32#temperature = ((-(a)+math.sqrt(a*a-4*b*(1-outputRes(voltage)/ro))/(2*b)))*1.8+32 # I like this one :P# read the voltage from channel 1 and display on the screenwhile True: print (str(D1)) print (str(D2)) print (str(D3)) print (str(D4)) print (str(D5)) print (str(D6)) print (str(D7)) print (str(D8)) Z1 = (r1/((vs/D2-1))) Z2 = (r1/((vs/D3-1))) print (str(Z1)) print (str(Z2)) # print (getTemp(2)) # Temperature 1 # print (getTemp(3)) # Temperature 2 tempAvg(2) tempAvg(3) time.sleep(2) print("\n" * 100)