Allan Veale / LCM101_DROPSAW

Now with Boilerplate and as used in finished DROPSAW project

lcm101.h@3:22f8cfcad8d6, 2018-10-12 (annotated)

Committer:
cnckiwi31
Date:
Fri Oct 12 12:09:59 2018 +0000
Revision:
3:22f8cfcad8d6
Parent:
2:77cffacfd89e
Child:
4:f7af875abe50
current on 12-10-2018

Who changed what in which revision?

UserRevisionLine numberNew contents of line
megrootens 0:116acb03eb85 1 #ifndef _LCM101_H_
megrootens 0:116acb03eb85 2 #define _LCM101_H_
megrootens 0:116acb03eb85 3
megrootens 0:116acb03eb85 4 #include "mbed.h"
megrootens 0:116acb03eb85 5
megrootens 0:116acb03eb85 6 /**
megrootens 0:116acb03eb85 7 * Simple class to read out an LCM101 S-beam force sensor connected to an analog
megrootens 0:116acb03eb85 8 * input.
megrootens 0:116acb03eb85 9 */
megrootens 0:116acb03eb85 10 class Lcm101 {
megrootens 0:116acb03eb85 11 public:
megrootens 0:116acb03eb85 12
megrootens 0:116acb03eb85 13 /**
megrootens 0:116acb03eb85 14 * @param pin_a_in PinName of analog input
megrootens 0:116acb03eb85 15 * @param offset of analog value (calibration data)
megrootens 0:116acb03eb85 16 * @param factor multiplication factor for analog value (calibration data)
megrootens 0:116acb03eb85 17 */
megrootens 0:116acb03eb85 18 Lcm101(PinName pin_a_in, float offset, float factor) :
megrootens 0:116acb03eb85 19 analog_in_(pin_a_in),
megrootens 0:116acb03eb85 20 kOffset_(offset),
megrootens 0:116acb03eb85 21 kFactor_(factor)
megrootens 0:116acb03eb85 22 {
megrootens 0:116acb03eb85 23 }
megrootens 0:116acb03eb85 24
megrootens 0:116acb03eb85 25 /**
megrootens 0:116acb03eb85 26 * @return unscaled analog input value
megrootens 0:116acb03eb85 27 */
megrootens 0:116acb03eb85 28 float getForceRaw()
megrootens 0:116acb03eb85 29 {
megrootens 0:116acb03eb85 30 return analog_in_.read();
megrootens 0:116acb03eb85 31 }
megrootens 0:116acb03eb85 32
megrootens 0:116acb03eb85 33 /**
megrootens 0:116acb03eb85 34 * @return force value kOffset_ + kFactor_ * getForceRaw();
megrootens 0:116acb03eb85 35 */
megrootens 0:116acb03eb85 36 float getForce()
megrootens 0:116acb03eb85 37 {
megrootens 0:116acb03eb85 38 return kOffset_ + kFactor_ * getForceRaw();
Technical_Muffin 2:77cffacfd89e 39 //it appears that higher order polynomials show better accuracy, within the 40 kg range that is.
Technical_Muffin 2:77cffacfd89e 40 // Awaiting other instructions, a linear fit will be currently used however.
megrootens 0:116acb03eb85 41 }
megrootens 0:116acb03eb85 42
megrootens 0:116acb03eb85 43 /**
cnckiwi31 3:22f8cfcad8d6 44 * sets force scaling offset so that current output is force zero
cnckiwi31 3:22f8cfcad8d6 45 */
cnckiwi31 3:22f8cfcad8d6 46 void nullForce()
cnckiwi31 3:22f8cfcad8d6 47 {
cnckiwi31 3:22f8cfcad8d6 48 kOffset_ = kOffset_ - getForce();
cnckiwi31 3:22f8cfcad8d6 49 return;
cnckiwi31 3:22f8cfcad8d6 50 }
cnckiwi31 3:22f8cfcad8d6 51
cnckiwi31 3:22f8cfcad8d6 52 /**
megrootens 0:116acb03eb85 53 * @return ffset of analog value
megrootens 0:116acb03eb85 54 */
megrootens 0:116acb03eb85 55 float get_offset() { return kOffset_; }
megrootens 0:116acb03eb85 56
megrootens 0:116acb03eb85 57 /**
megrootens 0:116acb03eb85 58 * @return factor multiplication factor for analog value
megrootens 0:116acb03eb85 59 */
megrootens 0:116acb03eb85 60 float get_factor() { return kFactor_; }
megrootens 0:116acb03eb85 61
megrootens 0:116acb03eb85 62
megrootens 0:116acb03eb85 63 private:
megrootens 0:116acb03eb85 64 AnalogIn analog_in_;
megrootens 0:116acb03eb85 65
cnckiwi31 3:22f8cfcad8d6 66 float kOffset_;
megrootens 0:116acb03eb85 67 const float kFactor_;
megrootens 0:116acb03eb85 68 };
megrootens 0:116acb03eb85 69
megrootens 0:116acb03eb85 70 #endif