M5Stack Gauges for Boats
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Hello,
this is my first post in this forum. I am pretty new to this product and not very experienced in Arduino programing. So I need your help in order to finalize my project. I do need several gauges for my boat. So I decided to try the M5Stack which allows me to display 3 different gauges on one display by simply pressing one of the three buttons. As a start I used the example "TFT_Meter_linear". So far the functionality is given. However, I would like to rotate the scale and the pointer. The command "tft.setRotation()" doesn't do it. I would appreciate if someone could give me a hint on which values I have to manipulate in order to get the desired result. I have attached a picture of the current and the required display as well as the code
Best regards
image url)An example analogue meter using a ILI9341 TFT LCD screen Needs Font 2 (also Font 4 if using large scale label) Make sure all the display driver and pin comnenctions are correct by editting the User_Setup.h file in the TFT_eSPI library folder. ######################################################################### ###### 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 M5.Lcd.rotation(0) or 1.3333 for M5.Lcd.rotation(1) #define M_SIZE 1.3333 #include <M5Stack.h> #define ADC_Calibration_Value1 250.0 // For resistor measure 5 Volt and 180 Ohm equals 100% plus 1K resistor. #define ADCpin1 35 // Potentiometer is connected to GPIO 35 (Analog ADC1_CH7) // add a 1k Resistor from pin 35 to +5V and a Diode from GND to pin 35 (Cathode) // a 10µf cap from GND to pin 35 may reduce a noisy needle #define TFT_GREY 0x5AEB float ltx = 0; // Saved x coord of bottom of needle uint16_t osx = M_SIZE*120, osy = M_SIZE*120; // Saved x & y coords uint32_t updateTime = 0; // time for next update int old_analog = -999; // Value last displayed int value[6] = {0, 0, 0, 0, 0, 0}; int old_value[6] = { -1, -1, -1, -1, -1, -1}; int d = 0; // variable for storing the potentiometer value int potValue = 0; void setup(void) { M5.begin(); M5.Power.begin(); // M5.Lcd.setRotation(1); // Serial.begin(57600); // For debug M5.Lcd.fillScreen(TFT_BLACK); analogMeter(); // Draw analogue meter updateTime = millis(); // Next update time } //***************************************************************************** // ReadADC is used to improve the linearity of the ESP32 ADC see: https://github.com/G6EJD/ESP32-ADC-Accuracy-Improvement-function double ReadADC(byte pin) { double reading = analogRead(pin); // Reference voltage is 3v3 so maximum reading is 3v3 = 4095 in range 0 to 4095 if (reading < 1 || reading > 4095) return 0; // return -0.000000000009824 * pow(reading,3) + 0.000000016557283 * pow(reading,2) + 0.000854596860691 * reading + 0.065440348345433; return (-0.000000000000016 * pow(reading, 4) + 0.000000000118171 * pow(reading, 3) - 0.000000301211691 * pow(reading, 2) + 0.001109019271794 * reading + 0.034143524634089) * 1000; } // Added an improved polynomial, use either, comment out as required void loop() { potValue = ReadADC(ADCpin1) * ADC_Calibration_Value1 / 4096; Serial.print(ReadADC(ADCpin1)); // print raw value Serial.print(" "); // tab Serial.println(potValue); // print final value delay(200); // to smoothen the pointer plotNeedle(potValue, 0); } // ######################################################################### // Draw the analogue meter on the screen // ######################################################################### void analogMeter() { // Meter outline M5.Lcd.fillRect(0, 0, M_SIZE*239, M_SIZE*126, TFT_GREY); M5.Lcd.fillRect(5, 3, M_SIZE*230, M_SIZE*119, TFT_WHITE); M5.Lcd.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; // Coodinates 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; // Green zone limits if (i >= -50 && i < 0) { M5.Lcd.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_GREEN); M5.Lcd.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_GREEN); } // Red zone limits if (i >= 0 && i <50) { M5.Lcd.fillTriangle(x0, y0, x1, y1, x2, y2, TFT_RED); M5.Lcd.fillTriangle(x1, y1, x2, y2, x3, y3, TFT_RED); } // 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 M5.Lcd.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: M5.Lcd.drawCentreString("40", x0, y0 - 12, 2); break; case -1: M5.Lcd.drawCentreString("20", x0, y0 - 9, 2); break; case 0: M5.Lcd.drawCentreString("CTR", x0, y0 - 7, 2); break; case 1: M5.Lcd.drawCentreString("20", x0, y0 - 9, 2); break; case 2: M5.Lcd.drawCentreString("40", 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) M5.Lcd.drawLine(x0, y0, x1, y1, TFT_BLACK); } M5.Lcd.drawString("Port", M_SIZE*(5 + 230 - 40), M_SIZE*(119 - 20), 2); // Label at bottom right M5.Lcd.drawString("STBD", M_SIZE*(5 + 60 - 40), M_SIZE*(119 - 20), 2); // Label at bottom left M5.Lcd.drawCentreString("Rudder", M_SIZE*120, M_SIZE*70, 4); // Comment out to avoid font 4 M5.Lcd.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) { 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 // Calcualte 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 M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx - 1), M_SIZE*(140 - 20), osx - 1, osy, TFT_WHITE); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx), M_SIZE*(140 - 20), osx, osy, TFT_WHITE); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx + 1), M_SIZE*(140 - 20), osx + 1, osy, TFT_WHITE); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx), M_SIZE*(140 - 20), osx, osy, TFT_WHITE); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx + 1), M_SIZE*(140 - 20), osx + 1, osy, TFT_WHITE); // Re-plot text under needle M5.Lcd.setTextColor(TFT_BLACK); M5.Lcd.drawCentreString("Rudder", 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 5 lines to thicken needle M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx - 1), M_SIZE*(140 - 20), osx - 1, osy, TFT_RED); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx), M_SIZE*(140 - 20), osx, osy, TFT_MAGENTA); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx + 1), M_SIZE*(140 - 20), osx + 1, osy, TFT_RED); M5.Lcd.drawLine(M_SIZE*(120 + 20 * ltx), M_SIZE*(140 - 20), osx, osy, TFT_MAGENTA); M5.Lcd.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); } } `` -
Sorry can't help your question. But would like to thank you for your code. Which i have adapted to display temperatures.
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Add the following to void loop ().
void loop() {
M5.update();
if(M5.BtnA.wasPressed()){M5.Lcd.setRotation(3);M5.Lcd.fillScreen(TFT_BLACK);analogMeter();}
if(M5.BtnC.wasPressed()){M5.Lcd.setRotation(1);M5.Lcd.fillScreen(TFT_BLACK);analogMeter();}