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Dependencies:   mbed

Fork of analoghalls5_5 by N K

sensors/currentsensors.cpp@28:af9d43bcb371, 2015-03-14 (annotated)

Committer:
bwang
Date:
Sat Mar 14 19:18:34 2015 +0000
Revision:
28:af9d43bcb371
Parent:
27:846c08fb3697 
[NONWORKING] Switched sensors to delay-based NativeAnalogIn class

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 AnalogCurrentSensor::AnalogCurrentSensor(PinName pin, float volts_per_amp) {
bwang 28:af9d43bcb371 5 _in = new NativeAnalogIn(pin);
bwang 0:54cf32d35f4d 6 _volts_per_amp = volts_per_amp;
bwang 24:f1ff9c7256b5 7 wait_us(100000);
bwang 0:54cf32d35f4d 8 Zero();
bwang 0:54cf32d35f4d 9 }
bwang 0:54cf32d35f4d 10
bwang 0:54cf32d35f4d 11 void AnalogCurrentSensor::Zero() {
nki 6:99ee0ce47fb2 12 float mean = 0;
nki 27:846c08fb3697 13 float last = 0;
nki 27:846c08fb3697 14 float count = 0;
nki 27:846c08fb3697 15 while(count <= 1000){
nki 27:846c08fb3697 16 if(*_in != last){
nki 27:846c08fb3697 17 mean = 0.99f * mean + (1.0f - 0.99f)*(*_in);
nki 27:846c08fb3697 18 count += 1.0f;
nki 27:846c08fb3697 19 }
nki 6:99ee0ce47fb2 20 }
nki 27:846c08fb3697 21 _zero_level = mean;
bwang 0:54cf32d35f4d 22 }
bwang 0:54cf32d35f4d 23
bwang 0:54cf32d35f4d 24 float AnalogCurrentSensor::GetCurrent() {
bwang 0:54cf32d35f4d 25 return ((float) *_in - _zero_level) * 3.3f / _volts_per_amp;
bwang 0:54cf32d35f4d 26 }