## NTCNTC - Negative Temperature Coefficient resistors is used in many places for measuering … temperature.
## The 4th order approximination formula
## Normal way of operationThe schematics below shows a standard setup. By use of a voltage divider its easy to calculate the resisatcne of the NTC when knowing supply voltage
## About proper selection of resistor in series with the NTCTake a look at the figure below for at 10 kOhm NTC
Schematic - from above --------------- Rldr == resistance of LDR Vo = Vcc * ( Rldr / (Rldr + R) ) Vo * (Rldr + R) = Vcc * Lldr Rldr * ( Vcc - Vo ) = R * Vo Rldr = R * ( Vo /( Vcc - Vo) ) QED comment: you need to know Vs and R
## Add infoIn the datasheet just below you will find the approximation for calculation of temperature from measured resistance. Its a 4th order approximation application note from Vishay incl rudimentary flow mea
## Arduino codeSee ntc.zip for a library and a small demo
## A movie |