![](/media/cache/profiles/0d382a5fec7012c843c1bdfb0935c9a6.50x50_q85.jpg)
A simple meter using Adafruit 2.8 TFT with touch v2
Dependencies: SPI_STMPE610 UniGraphic mbed vt100
A dumb simple voltage tester using ADC.
With FRDM-KL25Z, you can measure about 0V to 3.28V.
Nothing to drop your jaw nor holding your breath
but I wanted one, so I wrote one ;-)
とても単純はADCを使用した電圧テスターです。
FRDM-KL25Z を使用した場合、0V ~ 3.28V くらいが測定範囲です。
特に目新しいことも、驚くこともありませんが、
自分が欲しいので書いてみました (^ - ^)
On 18-May-2018
I changed the number display from 0.00 to 0.000
so that I can measure the change of a small loadcell.
2018年5月18日
ロードセル (重量センサ)の出力値の変化を見たかったので
有効数字を小数点以下2桁から3桁に変更しました。
Diff: meter.cpp
- Revision:
- 0:d01def9cf41e
- Child:
- 1:d7f2aa328962
diff -r 000000000000 -r d01def9cf41e meter.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/meter.cpp Thu Jul 20 02:37:13 2017 +0000 @@ -0,0 +1,149 @@ +#include "mbed.h" +#include <math.h> +#include <string.h> +#include "ILI9341.h" +#include "Arial12x12.h" +#include "Arial24x23.h" +#include "Arial28x28.h" +#include "Arial43x48_numb.h" +#include "SPI_STMPE610.h" +#include "meter.h" +#include "vt100.h" +#include "main.h" + +#ifndef M_PI +#define M_PI 3.141593 +#endif + +extern vt100 *tty ; +extern ILI9341 *tft ; +extern SPI_STMPE610 *tsc ; +extern meter *tacho ; +double SIN[451] ; +double COS[451] ; + +static void fillTriTable(void) +{ + double theta ; + int i ; + for (i = 1 ; i < 450 ; i++ ) { + theta = M_PI * (((double)(i + 450))/1800.0) ; + SIN[i] = sin( theta ) ; + COS[i] = cos( theta ) ; + } + SIN[0] = 0.0 ; + COS[0] = 1.0 ; + SIN[450] = 1.0 ; + COS[450] = 0.0 ; +} + +meter::meter(int x, int y, int width, int height, float min, float max) +{ + _x = x ; + _y = y ; + _w = width ; + _h = height ; + _value = min ; + _min = min ; + _max = max ; + _center_x = _x + _w / 2 ; + _center_y = _y + (2 * _h) / 3 ; + fillTriTable() ; +} + +meter::~meter(void) +{ +} + +void meter::drawFrame(void) +{ + tft->BusEnable(true) ; + tft->fillrect(_x, _y, _x+ _w - 1, _y+(2 * _h)/3 - 1, White) ; + tft->fillrect(_x, _y+(2 * _h)/3 - 1, _x + _w - 1, _y + _h - 1, Black) ; + tft->rect(_x, _y, _x + _w - 1, _y + _h - 1, Green) ; + tft->BusEnable(false) ; +} + +void meter::drawScale(void) +{ + int x1, x2, y1, y2 ; + double radius ; + double append ; + radius = _w / 2.0 ; + tft->BusEnable(true) ; + for (int i = 0 ; i < 450 ; i += 45 ) { + x1 = (radius * COS[i] + 0.5) ; + y1 = (radius * SIN[i] + 0.5) ; + if ((i % 10) == 5) { + append = 5 ; + } else { + append = 10 ; + } + x2 = ((radius + append) * COS[i] + 0.5) ; + y2 = ((radius + append) * SIN[i] + 0.5) ; + tft->line(_center_x + x1, _center_y - y1, _center_x + x2, _center_y - y2, Black) ; + tft->line(_center_x - x1, _center_y - y1, _center_x - x2, _center_y - y2, Black) ; + } + tft->line(_center_x, _center_y - radius, _center_x, _center_y - (radius + 10), Black) ; + tft->BusEnable(false) ; +} + +void meter::drawHand(float value) +{ + static int prev_x1 = 0, prev_x2 = 0, prev_y1 = 0, prev_y2 = 0 ; + int x1, x2, y1, y2 ; + double theta ; + double radius = _w / 20.0 ; + double append = 8.0 * (_w / 20.0) ; + int i ; + + theta = 90.0 - (90.0 * (value / _max)) ; + if (theta > 45.0) { + i = (10.0 * (90.0 - theta + 45.0) + 0.5) ; + x1 = _center_x -(radius * COS[i-450] + 0.5) ; + x2 = _center_x -((radius + append) * COS[i-450] + 0.5) ; + } else { + i = (10.0 * (theta + 45.0) + 0.5) ; + x1 = _center_x + (radius * COS[i-450] + 0.5) ; + x2 = _center_x + ((radius + append) * COS[i-450] + 0.5) ; + } + y1 = _center_y - (radius * SIN[i-450] + 0.5) ; + y2 = _center_y - ((radius + append) * SIN[i-450] + 0.5) ; + tft->BusEnable(true) ; + tft->line(prev_x1, prev_y1, prev_x2, prev_y2, White) ; + tft->line(x1, y1, x2, y2, Black) ; + tft->BusEnable(false) ; + prev_x1 = x1 ; + prev_x2 = x2 ; + prev_y1 = y1 ; + prev_y2 = y2 ; +} + +void meter::draw(void) +{ +} + +void meter::draw(float value) +{ + tft->BusEnable(true) ; + drawHand(_value) ; + tft->BusEnable(false) ; +} + +void meter::drawValue(float value) +{ + char str[32] ; + int v1, v2 ; + v1 = (int)value ; + v2 = ((int)(100.0 * value) % 100) ; + sprintf(str, "%d.%02d V", v1, v2) ; + tft->BusEnable(true) ; + tft->locate(80, 190) ; + tft->printf(str) ; + wait(0.01) ; + tft->BusEnable(false) ; +} + +void meter::update(float value) +{ +} \ No newline at end of file