Adrian Adamson / lmt70_sensor

Converts the output from a Texas Instruments LMT70 temperature sensor (in mV) to degrees C

convert_lmt70.cpp@0:2cbfc517b1c4, 2015-10-22 (annotated)

Committer:
adamsona
Date:
Thu Oct 22 16:58:50 2015 +0000
Revision:
0:2cbfc517b1c4
Initial release.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
adamsona 0:2cbfc517b1c4 1 #include "convert_lmt70.h"
adamsona 0:2cbfc517b1c4 2
adamsona 0:2cbfc517b1c4 3 /* Converts voltage output from Texas Instruments LMT70 temp sensor into degrees C
adamsona 0:2cbfc517b1c4 4 using the 3rd-order lookup table that's a best fit for the full range of -55C - 150C
adamsona 0:2cbfc517b1c4 5 found at http://www.ti.com/lit/ds/symlink/lmt70.pdf
adamsona 0:2cbfc517b1c4 6 */
adamsona 0:2cbfc517b1c4 7 float convert_lmt70 (float mV) {
adamsona 0:2cbfc517b1c4 8 float a, b, c, d;
adamsona 0:2cbfc517b1c4 9 a = -1.064200E-09;
adamsona 0:2cbfc517b1c4 10 b = -5.759725E-06;
adamsona 0:2cbfc517b1c4 11 c = -1.789883E-01;
adamsona 0:2cbfc517b1c4 12 d = 2.048570E+02;
adamsona 0:2cbfc517b1c4 13
adamsona 0:2cbfc517b1c4 14 return a*mV*mV*mV + b* mV*mV + c*mV + d;
adamsona 0:2cbfc517b1c4 15 }