La Suno / Mbed 2 deprecated afero_poc15_180302

Release candidate version. The pointer in GAS Pressure display is changed to a triangle.

Dependencies:   UniGraphic mbed vt100

Please note, at 2-Mar-2018 the current version of mbed-lib has a defect in Ticker.
https://os.mbed.com/forum/bugs-suggestions/topic/29287/

So, mbed lib version 157 is intentionally being used.
Please do not update mbed library until the problem in the above URL is fixed.

In this version, format of GAS Pressure Display has been changed.
/media/uploads/Rhyme/low.jpg

/media/uploads/Rhyme/good.jpg

/media/uploads/Rhyme/high.jpg

moto

sensors/PSE530.cpp@0:774324cbc5a6, 2018-03-02 (annotated)

Committer:
Rhyme
Date:
Fri Mar 02 07:56:09 2018 +0000
Revision:
0:774324cbc5a6
Release candidate version. GAS Pressure pointer is now a triangle.; Some source file clean-up was done.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rhyme 0:774324cbc5a6 1 #include "mbed.h"
Rhyme 0:774324cbc5a6 2 #include "PSE530.h"
Rhyme 0:774324cbc5a6 3
Rhyme 0:774324cbc5a6 4 /**
Rhyme 0:774324cbc5a6 5 * SMC PSE530 pressure sensor
Rhyme 0:774324cbc5a6 6 * analog output 1.0V - 5.0V
Rhyme 0:774324cbc5a6 7 * 1.0V : 0
Rhyme 0:774324cbc5a6 8 * 5.0V : 1MPa
Rhyme 0:774324cbc5a6 9 * (at 0.6V : -0.1MPa)
Rhyme 0:774324cbc5a6 10 * Our sensor I/F converts 0-5V to 0-3V
Rhyme 0:774324cbc5a6 11 * So we suppose V = Analog Float Value : Pressure
Rhyme 0:774324cbc5a6 12 * 0.6V = 0.2 : 0
Rhyme 0:774324cbc5a6 13 * 3.0V = 1.0 : 1MPa
Rhyme 0:774324cbc5a6 14 */
Rhyme 0:774324cbc5a6 15
Rhyme 0:774324cbc5a6 16 /**
Rhyme 0:774324cbc5a6 17 * conversion from Pa to kgf/cm2
Rhyme 0:774324cbc5a6 18 * 98,066.5 Pa = 1 kgf/cm2
Rhyme 0:774324cbc5a6 19 * 1 Pa = 1 / 98066.6 kgf/cm2
Rhyme 0:774324cbc5a6 20 */
Rhyme 0:774324cbc5a6 21
Rhyme 0:774324cbc5a6 22 PSE530::PSE530(AnalogIn *ain)
Rhyme 0:774324cbc5a6 23 {
Rhyme 0:774324cbc5a6 24 _ain = ain ;
Rhyme 0:774324cbc5a6 25 }
Rhyme 0:774324cbc5a6 26
Rhyme 0:774324cbc5a6 27 PSE530::~PSE530(void)
Rhyme 0:774324cbc5a6 28 {
Rhyme 0:774324cbc5a6 29 if (_ain) {
Rhyme 0:774324cbc5a6 30 delete _ain ;
Rhyme 0:774324cbc5a6 31 }
Rhyme 0:774324cbc5a6 32 }
Rhyme 0:774324cbc5a6 33
Rhyme 0:774324cbc5a6 34 /**
Rhyme 0:774324cbc5a6 35 * On FRDM-KL25Z ADC's AREF is about 3.28V
Rhyme 0:774324cbc5a6 36 * Where the converted pressure output is 0 to 3.21V
Rhyme 0:774324cbc5a6 37 * So we must map ADC output 0 to 3.21/3.28 as full scale
Rhyme 0:774324cbc5a6 38 *
Rhyme 0:774324cbc5a6 39 * Then according to the datasheet of PSE530
Rhyme 0:774324cbc5a6 40 * when full range is 0V to 5V
Rhyme 0:774324cbc5a6 41 * 1V is 0 and 5V is 1MPa which is converted to
Rhyme 0:774324cbc5a6 42 * 0.642/3.28 to 3.21/3.28 ~ 0.195731 to 0.9786585.
Rhyme 0:774324cbc5a6 43 * The linear equation of
Rhyme 0:774324cbc5a6 44 * y = a x + b
Rhyme 0:774324cbc5a6 45 * 0 = a * 0.195731 + b
Rhyme 0:774324cbc5a6 46 * 1 = a * 0.978658 + b
Rhyme 0:774324cbc5a6 47 * results a = 1.277, b = -0.250
Rhyme 0:774324cbc5a6 48 */
Rhyme 0:774324cbc5a6 49 float PSE530::getPressure(void)
Rhyme 0:774324cbc5a6 50 {
Rhyme 0:774324cbc5a6 51 float coef_A = 1.277 ;
Rhyme 0:774324cbc5a6 52 float coef_B = -0.250 ;
Rhyme 0:774324cbc5a6 53 float av = 0.0 ;
Rhyme 0:774324cbc5a6 54 float value = 0.0 ;
Rhyme 0:774324cbc5a6 55 av = coef_A * _ain->read() + coef_B ;
Rhyme 0:774324cbc5a6 56 // printf("Pressure ADC = %.4f\n", av) ;
Rhyme 0:774324cbc5a6 57 value = 1000000 * av ; /* 1MPa at 1.0 */
Rhyme 0:774324cbc5a6 58 value = value / 98066.5 ; /* Pa -> kgf/cm2 */
Rhyme 0:774324cbc5a6 59 return( value ) ;
Rhyme 0:774324cbc5a6 60 }