N K / Mbed 2 deprecated analoghalls5_5

working-est copy with class-based code. still open loop

Dependencies:   mbed

Fork of analoghalls6 by N K

tempsensors.cpp@10:b4abecccec7a, 2015-03-08 (annotated)

Committer:
nki
Date:
Sun Mar 08 00:45:28 2015 +0000
Revision:
10:b4abecccec7a
Parent:
1:1f58bdcf2956 
uguu;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bwang 0:54cf32d35f4d 1 #include "includes.h"
bwang 1:1f58bdcf2956 2 #include "sensors.h"
bwang 0:54cf32d35f4d 3
bwang 0:54cf32d35f4d 4 NtcTempSensor::NtcTempSensor(PinName pin, float r_25, float ntc_b, float r_divider) {
bwang 0:54cf32d35f4d 5 _in = new AnalogIn(pin);
bwang 0:54cf32d35f4d 6 _ntc_b = ntc_b;
bwang 0:54cf32d35f4d 7 _ntc_a = r_25 / exp(_ntc_b / 298.0f);
bwang 0:54cf32d35f4d 8 _r_divider = r_divider;
bwang 0:54cf32d35f4d 9 }
bwang 0:54cf32d35f4d 10
bwang 0:54cf32d35f4d 11 float NtcTempSensor::GetTemp() {
bwang 0:54cf32d35f4d 12 float v = (float) *_in * 3.3f;
bwang 0:54cf32d35f4d 13 float r_n = v * _r_divider / (1.0f + v);
bwang 0:54cf32d35f4d 14 return _ntc_b / log (r_n / _ntc_a);
bwang 0:54cf32d35f4d 15 }