Joshua Marshall / ACS712

A library for interfacing the ACS712 Hall Effect Current Sensor module with a microcontroller

ACS712.cpp@0:c0c26e03d080, 2019-10-10 (annotated)

Committer:
JRM1986
Date:
Thu Oct 10 11:04:18 2019 +0000
Revision:
0:c0c26e03d080
Pre Publish Commit;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JRM1986 0:c0c26e03d080 1 #include "ACS712.h"
JRM1986 0:c0c26e03d080 2 #include "mbed.h"
JRM1986 0:c0c26e03d080 3
JRM1986 0:c0c26e03d080 4 // Constructor/Destructor
JRM1986 0:c0c26e03d080 5 ACS712::ACS712(PinName const outpin)
JRM1986 0:c0c26e03d080 6
JRM1986 0:c0c26e03d080 7 :
JRM1986 0:c0c26e03d080 8
JRM1986 0:c0c26e03d080 9 _aInPin(new AnalogIn(outpin))
JRM1986 0:c0c26e03d080 10
JRM1986 0:c0c26e03d080 11 {}
JRM1986 0:c0c26e03d080 12
JRM1986 0:c0c26e03d080 13 ACS712::~ACS712()
JRM1986 0:c0c26e03d080 14 {
JRM1986 0:c0c26e03d080 15 delete _aInPin;
JRM1986 0:c0c26e03d080 16 }
JRM1986 0:c0c26e03d080 17
JRM1986 0:c0c26e03d080 18 // ----- Public Methods -----
JRM1986 0:c0c26e03d080 19
JRM1986 0:c0c26e03d080 20 void ACS712::init()
JRM1986 0:c0c26e03d080 21 {
JRM1986 0:c0c26e03d080 22
JRM1986 0:c0c26e03d080 23 }
JRM1986 0:c0c26e03d080 24 double ACS712::read_current_sensor()
JRM1986 0:c0c26e03d080 25 {
JRM1986 0:c0c26e03d080 26 double val;
JRM1986 0:c0c26e03d080 27 val = _aInPin->read();
JRM1986 0:c0c26e03d080 28 val *= val;
JRM1986 0:c0c26e03d080 29 val = sqrt(val);
JRM1986 0:c0c26e03d080 30 return val;
JRM1986 0:c0c26e03d080 31 }
JRM1986 0:c0c26e03d080 32
JRM1986 0:c0c26e03d080 33 int ACS712::read_ain_uint_16()
JRM1986 0:c0c26e03d080 34 {
JRM1986 0:c0c26e03d080 35 int val = 0;
JRM1986 0:c0c26e03d080 36
JRM1986 0:c0c26e03d080 37 val = _aInPin->read_u16();
JRM1986 0:c0c26e03d080 38
JRM1986 0:c0c26e03d080 39 return val;
JRM1986 0:c0c26e03d080 40 }
JRM1986 0:c0c26e03d080 41
JRM1986 0:c0c26e03d080 42 void ACS712::convert_to_amps(float acs_offset, float gain, int type)
JRM1986 0:c0c26e03d080 43 {
JRM1986 0:c0c26e03d080 44
JRM1986 0:c0c26e03d080 45 double _current_in = read_current_sensor()*3.3;
JRM1986 0:c0c26e03d080 46
JRM1986 0:c0c26e03d080 47 switch(type) {
JRM1986 0:c0c26e03d080 48
JRM1986 0:c0c26e03d080 49 case 5:
JRM1986 0:c0c26e03d080 50 _current = (acs_offset*gain - _current_in*gain)/.185*gain;
JRM1986 0:c0c26e03d080 51 break;
JRM1986 0:c0c26e03d080 52 case 20:
JRM1986 0:c0c26e03d080 53 _current = (acs_offset*gain - _current_in*gain)/.100*gain;
JRM1986 0:c0c26e03d080 54 break;
JRM1986 0:c0c26e03d080 55 case 30:
JRM1986 0:c0c26e03d080 56 _current = (_current_in*gain - acs_offset*gain)/.066*gain;
JRM1986 0:c0c26e03d080 57 break;
JRM1986 0:c0c26e03d080 58 default:
JRM1986 0:c0c26e03d080 59 _current = 999.9;
JRM1986 0:c0c26e03d080 60 break;
JRM1986 0:c0c26e03d080 61
JRM1986 0:c0c26e03d080 62 }
JRM1986 0:c0c26e03d080 63
JRM1986 0:c0c26e03d080 64 }
JRM1986 0:c0c26e03d080 65
JRM1986 0:c0c26e03d080 66
JRM1986 0:c0c26e03d080 67 bool ACS712::over_current_detection(double operating_current)
JRM1986 0:c0c26e03d080 68 {
JRM1986 0:c0c26e03d080 69
JRM1986 0:c0c26e03d080 70 bool current_spike_flag = false;
JRM1986 0:c0c26e03d080 71
JRM1986 0:c0c26e03d080 72 if(_current > (1.1*operating_current)) {
JRM1986 0:c0c26e03d080 73
JRM1986 0:c0c26e03d080 74 current_spike_flag = true;
JRM1986 0:c0c26e03d080 75
JRM1986 0:c0c26e03d080 76 }
JRM1986 0:c0c26e03d080 77 else {
JRM1986 0:c0c26e03d080 78
JRM1986 0:c0c26e03d080 79 current_spike_flag = false;
JRM1986 0:c0c26e03d080 80
JRM1986 0:c0c26e03d080 81 }
JRM1986 0:c0c26e03d080 82
JRM1986 0:c0c26e03d080 83 return current_spike_flag;
JRM1986 0:c0c26e03d080 84
JRM1986 0:c0c26e03d080 85 }
JRM1986 0:c0c26e03d080 86
JRM1986 0:c0c26e03d080 87 float ACS712::get_current_amps()
JRM1986 0:c0c26e03d080 88 {
JRM1986 0:c0c26e03d080 89
JRM1986 0:c0c26e03d080 90 return _current;
JRM1986 0:c0c26e03d080 91
JRM1986 0:c0c26e03d080 92 }