Cyd Anzeige

#include <TFT_eSPI.h>
#include <SPI.h>
#include "Adafruit_MAX31855.h"

#define MAXDO   35
#define MAXCS   22
#define MAXCLK  27
Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);

TFT_eSPI tft = TFT_eSPI();  // TFT instance

#define CENTER_X 160
#define CENTER_Y 120
#define RADIUS 100
#define NEEDLE_LEN 80

float angleMin = 180;  // Angle for -20
float angleMax = 0;   // Angle for +80
int valueMin = -20;
int valueMax = 80;

int prevX = CENTER_X;
int prevY = CENTER_Y;

void setup() {
  thermocouple.begin();
  Serial.begin(115200);
  tft.init();
  tft.setRotation(1);
  tft.fillScreen(TFT_BLACK);

  drawGauge();
  updateNeedle(0);
  tft.fillCircle(160, 120, 3, TFT_BLUE);

}

void loop() {
  float c = thermocouple.readCelsius();
  Serial.print("$");
  Serial.print(c);
  Serial.print(";");
    delay(250);
    float val=c;
    if (val >= valueMin && val <= valueMax) {
      updateNeedle(val);
    }
}

void drawGauge() {
  // Draw major and minor ticks
  for (int i = valueMin; i <= valueMax; i++) {
    float angle = map(i, valueMin, valueMax, angleMin, angleMax) * DEG_TO_RAD;
    int xStart = CENTER_X + cos(angle) * (RADIUS - (i % 10 == 0 ? 10 : 5));
    int yStart = CENTER_Y + sin(angle) * (RADIUS - (i % 10 == 0 ? 10 : 5));
    int xEnd = CENTER_X + cos(angle) * RADIUS;
    int yEnd = CENTER_Y + sin(angle) * RADIUS;

    tft.drawLine(xStart, yStart, xEnd, yEnd, (i % 10 == 0) ? TFT_BLUE : TFT_GREEN);

    if (i % 10 == 0) {
      // Draw label
      int xLabel = CENTER_X + cos(angle) * (RADIUS - 20);
      int yLabel = CENTER_Y + sin(angle) * (RADIUS - 20);
      tft.setTextColor(TFT_WHITE, TFT_BLACK);
      tft.setTextDatum(MC_DATUM);
      tft.drawString(String(i), xLabel, yLabel);
    }
  }
}

void updateNeedle(int value) {
  // Erase previous needle
  tft.drawLine(CENTER_X, CENTER_Y, prevX, prevY, TFT_BLACK);

  float angle = map(value, valueMin, valueMax, angleMin, angleMax) * DEG_TO_RAD;
  int x = CENTER_X + cos(angle) * NEEDLE_LEN;
  int y = CENTER_Y + sin(angle) * NEEDLE_LEN;

  // Draw new needle
  tft.drawLine(CENTER_X, CENTER_Y, x, y, TFT_RED);

  // Update label
  tft.fillRect(150, 90, 40, 20, TFT_BLACK);  // Clear previous label
  tft.setTextFont(7);
  tft.setTextColor(TFT_RED, TFT_BLACK);
  tft.setTextSize(1);
  tft.setCursor(130, 40);
  tft.print(String(value) + " C");

  // Save previous needle position
  prevX = x;
  prevY = y;
}