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2024-10-1102 Analog

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src/main.cpp
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#include <Arduino.h> #include <Arduino.h>
/* Rui Santos & Sara Santos - Random Nerd Tutorials /*
THIS EXAMPLE WAS TESTED WITH THE FOLLOWING HARDWARE: An example analogue meter using a ILI9341 TFT LCD screen
1) ESP32-2432S028R 2.8 inch 240×320 also known as the Cheap Yellow Display (CYD): https://makeradvisor.com/tools/cyd-cheap-yellow-display-esp32-2432s028r/
SET UP INSTRUCTIONS: https://RandomNerdTutorials.com/cyd/ Needs Font 2 (also Font 4 if using large scale label)
2) REGULAR ESP32 Dev Board + 2.8 inch 240x320 TFT Display: https://makeradvisor.com/tools/2-8-inch-ili9341-tft-240x320/ and https://makeradvisor.com/tools/esp32-dev-board-wi-fi-bluetooth/
SET UP INSTRUCTIONS: https://RandomNerdTutorials.com/esp32-tft/ Make sure all the display driver and pin connections are correct by
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files. editing the User_Setup.h file in the TFT_eSPI library folder.
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*/ #########################################################################
###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
#########################################################################
Updated by Bodmer for variable meter size
*/
// Define meter size as 1 for tft.rotation(0) or 1.3333 for tft.rotation(1)
#define M_SIZE 1.3333
#include <SPI.h>
#include <TFT_eSPI.h> // Hardware-specific library #include <TFT_eSPI.h> // Hardware-specific library
#include <SPI.h>
/* Install the "TFT_eSPI" library by Bodmer to interface with the TFT Display - https://github.com/Bodmer/TFT_eSPI TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
*** IMPORTANT: User_Setup.h available on the internet will probably NOT work with the examples available at Random Nerd Tutorials ***
*** YOU MUST USE THE User_Setup.h FILE PROVIDED IN THE LINK BELOW IN ORDER TO USE THE EXAMPLES FROM RANDOM NERD TUTORIALS ***
FULL INSTRUCTIONS AVAILABLE ON HOW CONFIGURE THE LIBRARY: https://RandomNerdTutorials.com/cyd/ or https://RandomNerdTutorials.com/esp32-tft/ */
//#include
#define TFT_GREY 0x5AEB
// Install the "XPT2046_Touchscreen" library by Paul Stoffregen to use the Touchscreen - https://github.com/PaulStoffregen/XPT2046_Touchscreen float ltx = 0; // Saved x coord of bottom of needle
// Note: this library doesn't require further configuration uint16_t osx = M_SIZE*120, osy = M_SIZE*120; // Saved x & y coords
#include <XPT2046_Touchscreen.h> uint32_t updateTime = 0; // time for next update
int old_analog = -999; // Value last displayed
TFT_eSPI tft = TFT_eSPI(); int value[6] = {0, 0, 0, 0, 0, 0};
int old_value[6] = { -1, -1, -1, -1, -1, -1};
int d = 0;
// Touchscreen pins void analogMeter();
#define XPT2046_IRQ 36 // T_IRQ void plotNeedle(int value, byte ms_delay);
#define XPT2046_MOSI 32 // T_DIN
#define XPT2046_MISO 39 // T_OUT
#define XPT2046_CLK 25 // T_CLK
#define XPT2046_CS 33 // T_CS
SPIClass touchscreenSPI = SPIClass(VSPI); void setup(void) {
XPT2046_Touchscreen touchscreen(XPT2046_CS, XPT2046_IRQ);
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 240
#define FONT_SIZE 2
// Touchscreen coordinates: (x, y) and pressure (z)
int x, y, z;
// Print Touchscreen info about X, Y and Pressure (Z) on the Serial Monitor
void printTouchToSerial(int touchX, int touchY, int touchZ) {
Serial.print("X = ");
Serial.print(touchX);
Serial.print(" | Y = ");
Serial.print(touchY);
Serial.print(" | Pressure = ");
Serial.print(touchZ);
Serial.println();
}
// Print Touchscreen info about X, Y and Pressure (Z) on the TFT Display
void printTouchToDisplay(int touchX, int touchY, int touchZ) {
// Clear TFT screen
tft.fillScreen(TFT_GREEN);
tft.setTextColor(TFT_RED, TFT_WHITE);
int centerX = SCREEN_WIDTH / 2;
int textY = 80;
String tempText = "X = " + String(touchX);
tft.drawCentreString(tempText, centerX, textY, FONT_SIZE);
textY += 20;
tempText = "Y = " + String(touchY);
tft.drawCentreString(tempText, centerX, textY, FONT_SIZE);
textY += 20;
tempText = "Pressure = " + String(touchZ);
tft.drawCentreString(tempText, centerX, textY, FONT_SIZE);
}
void setup() {
Serial.begin(115200);
// Start the SPI for the touchscreen and init the touchscreen
touchscreenSPI.begin(XPT2046_CLK, XPT2046_MISO, XPT2046_MOSI, XPT2046_CS);
touchscreen.begin();
// Set the Touchscreen rotation in landscape mode
// Note: in some displays, the touchscreen might be upside down, so you might need to set the rotation to 3: touchscreen.setRotation(3);
touchscreen.setRotation(1);
// Start the tft display
tft.init(); tft.init();
// Set the TFT display rotation in landscape mode
tft.setRotation(1); tft.setRotation(1);
Serial.begin(57600); // For debug
tft.fillScreen(TFT_BLACK);
tft.drawString("Raumfeuchtigkeit", 1, 210, 4);
//delay(9000);
// Clear the screen before writing to it analogMeter(); // Draw analogue meter
tft.fillScreen(TFT_WHITE);
tft.setTextColor(TFT_BLACK, TFT_WHITE);
// Set X and Y coordinates for center of display updateTime = millis(); // Next update time
int centerX = SCREEN_WIDTH / 2;
int centerY = SCREEN_HEIGHT / 2;
tft.drawCentreString("Hello, world!", centerX, 30, FONT_SIZE);
tft.drawCentreString("Touch screen to test", centerX, centerY, FONT_SIZE);
delay(5000);
} }
void loop() { void loop() {
// Checks if Touchscreen was touched, and prints X, Y and Pressure (Z) info on the TFT display and Serial Monitor if (updateTime <= millis()) {
if (touchscreen.tirqTouched() && touchscreen.touched()) { updateTime = millis() + 35; // Update meter every 35 milliseconds
// Get Touchscreen points
TS_Point p = touchscreen.getPoint();
// Calibrate Touchscreen points with map function to the correct width and height
x = map(p.x, 200, 3700, 1, SCREEN_WIDTH);
y = map(p.y, 240, 3800, 1, SCREEN_HEIGHT);
z = p.z;
printTouchToSerial(x, y, z); // Create a Sine wave for testing
printTouchToDisplay(x, y, z); d += 4; if (d >= 360) d = 0;
value[0] = 50 + 50 * sin((d + 0) * 0.0174532925);
delay(100); plotNeedle(value[0], 0); // It takes between 2 and 12ms to replot the needle with zero delay
}
}
// #########################################################################
// Draw the analogue meter on the screen
// #########################################################################
void analogMeter()
{
// Meter outline
tft.fillRect(0, 0, M_SIZE*239, M_SIZE*126, TFT_GREY);
tft.fillRect(5, 3, M_SIZE*230, M_SIZE*119, TFT_WHITE);
tft.setTextColor(TFT_BLACK); // Text colour
// Draw ticks every 5 degrees from -50 to +50 degrees (100 deg. FSD swing)
for (int i = -50; i < 51; i += 5) {
// Long scale tick length
int tl = 15;
// Coordinates of tick to draw
float sx = cos((i - 90) * 0.0174532925);
float sy = sin((i - 90) * 0.0174532925);
uint16_t x0 = sx * (M_SIZE*100 + tl) + M_SIZE*120;
uint16_t y0 = sy * (M_SIZE*100 + tl) + M_SIZE*140;
uint16_t x1 = sx * M_SIZE*100 + M_SIZE*120;
uint16_t y1 = sy * M_SIZE*100 + M_SIZE*140;
// Coordinates of next tick for zone fill
float sx2 = cos((i + 5 - 90) * 0.0174532925);
float sy2 = sin((i + 5 - 90) * 0.0174532925);
int x2 = sx2 * (M_SIZE*100 + tl) + M_SIZE*120;
int y2 = sy2 * (M_SIZE*100 + tl) + M_SIZE*140;
int x3 = sx2 * M_SIZE*100 + M_SIZE*120;
int y3 = sy2 * M_SIZE*100 + M_SIZE*140;
// Yellow zone limits
//if (i >= -50 && i < 0) {
// tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_YELLOW);
// tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_YELLOW);
//}
// Green zone limits
if (i >= 0 && i < 25) {
tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_GREEN);
tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_GREEN);
}
// Orange zone limits
if (i >= 25 && i < 50) {
tft.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_ORANGE);
tft.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_ORANGE);
}
// Short scale tick length
if (i % 25 != 0) tl = 8;
// Recalculate coords incase tick lenght changed
x0 = sx * (M_SIZE*100 + tl) + M_SIZE*120;
y0 = sy * (M_SIZE*100 + tl) + M_SIZE*140;
x1 = sx * M_SIZE*100 + M_SIZE*120;
y1 = sy * M_SIZE*100 + M_SIZE*140;
// Draw tick
tft.drawLine(x0, y0, x1, y1, TFT_BLACK);
// Check if labels should be drawn, with position tweaks
if (i % 25 == 0) {
// Calculate label positions
x0 = sx * (M_SIZE*100 + tl + 10) + M_SIZE*120;
y0 = sy * (M_SIZE*100 + tl + 10) + M_SIZE*140;
switch (i / 25) {
case -2: tft.drawCentreString("0", x0, y0 - 12, 2); break;
case -1: tft.drawCentreString("25", x0, y0 - 9, 2); break;
case 0: tft.drawCentreString("50", x0, y0 - 7, 2); break;
case 1: tft.drawCentreString("75", x0, y0 - 9, 2); break;
case 2: tft.drawCentreString("100", x0, y0 - 12, 2); break;
}
}
// Now draw the arc of the scale
sx = cos((i + 5 - 90) * 0.0174532925);
sy = sin((i + 5 - 90) * 0.0174532925);
x0 = sx * M_SIZE*100 + M_SIZE*120;
y0 = sy * M_SIZE*100 + M_SIZE*140;
// Draw scale arc, don't draw the last part
if (i < 50) tft.drawLine(x0, y0, x1, y1, TFT_BLACK);
}
tft.drawString("%", M_SIZE*(5 + 230 - 40), M_SIZE*(119 - 20), 2); // Units at bottom right
tft.drawCentreString("%", M_SIZE*120, M_SIZE*70, 4); // Comment out to avoid font 4
tft.drawRect(5, 3, M_SIZE*230, M_SIZE*119, TFT_BLACK); // Draw bezel line
plotNeedle(0, 0); // Put meter needle at 0
}
// #########################################################################
// Update needle position
// This function is blocking while needle moves, time depends on ms_delay
// 10ms minimises needle flicker if text is drawn within needle sweep area
// Smaller values OK if text not in sweep area, zero for instant movement but
// does not look realistic... (note: 100 increments for full scale deflection)
// #########################################################################
void plotNeedle(int value, byte ms_delay)
{
tft.setTextColor(TFT_BLACK, TFT_WHITE);
char buf[8]; dtostrf(value, 4, 0, buf);
tft.drawRightString(buf, M_SIZE*40, M_SIZE*(119 - 20), 2);
if (value < -10) value = -10; // Limit value to emulate needle end stops
if (value > 110) value = 110;
// Move the needle until new value reached
while (!(value == old_analog)) {
if (old_analog < value) old_analog++;
else old_analog--;
if (ms_delay == 0) old_analog = value; // Update immediately if delay is 0
float sdeg = map(old_analog, -10, 110, -150, -30); // Map value to angle
// Calculate tip of needle coords
float sx = cos(sdeg * 0.0174532925);
float sy = sin(sdeg * 0.0174532925);
// Calculate x delta of needle start (does not start at pivot point)
float tx = tan((sdeg + 90) * 0.0174532925);
// Erase old needle image
tft.drawLine(M_SIZE*(120 + 20 * ltx - 1), M_SIZE*(140 - 20), osx - 1, osy, TFT_WHITE);
tft.drawLine(M_SIZE*(120 + 20 * ltx), M_SIZE*(140 - 20), osx, osy, TFT_WHITE);
tft.drawLine(M_SIZE*(120 + 20 * ltx + 1), M_SIZE*(140 - 20), osx + 1, osy, TFT_WHITE);
// Re-plot text under needle
tft.setTextColor(TFT_BLACK);
tft.drawCentreString("%", M_SIZE*120, M_SIZE*70, 4); // // Comment out to avoid font 4
// Store new needle end coords for next erase
ltx = tx;
osx = M_SIZE*(sx * 98 + 120);
osy = M_SIZE*(sy * 98 + 140);
// Draw the needle in the new postion, magenta makes needle a bit bolder
// draws 3 lines to thicken needle
tft.drawLine(M_SIZE*(120 + 20 * ltx - 1), M_SIZE*(140 - 20), osx - 1, osy, TFT_RED);
tft.drawLine(M_SIZE*(120 + 20 * ltx), M_SIZE*(140 - 20), osx, osy, TFT_MAGENTA);
tft.drawLine(M_SIZE*(120 + 20 * ltx + 1), M_SIZE*(140 - 20), osx + 1, osy, TFT_RED);
// Slow needle down slightly as it approaches new postion
if (abs(old_analog - value) < 10) ms_delay += ms_delay / 5;
// Wait before next update
delay(ms_delay);
} }
} }
@ -131,3 +227,5 @@ void loop() {