// GCA901_Nano_voltage_meter // // grid voltage variation monitor (230V - 250V AC) // rolling averaged voltage (of 10 readings) is sent to display // NOTE: here voltage generated with random function // // microcontroller: Arduino Nano // display 240*240 circular SPI 3.3V TFT with GC9A01 controller // // note: random function drives fluctuations of the parameter named 'volt' // CG9A01 Arduino Nano // RST -------- NC // CST -------- 10 // DC --------- 9 // SDA -------- 11 - green wire // SCL -------- 13 - yellow wire // // Floris Wouterlood // September 1, 2023 // public domain // made for a 240*240 pixel circular display // all x-y-coordinates relative to center = x = 120 and y = 120 #include "SPI.h" #include "Adafruit_GFX.h" #include "Adafruit_GC9A01A.h" #define TFT_DC 2 #define TFT_CS 15 Adafruit_GC9A01A tft (TFT_CS, TFT_DC); #define BLACK 0x0000 // some extra colors #define BLUE 0x001F #define RED 0xF800 #define GREEN 0x07E0 #define CYAN 0x07FF #define MAGENTA 0xF81F #define YELLOW 0xFFE0 #define WHITE 0xFFFF #define ORANGE 0xFBE0 #define GREY 0x84B5 #define BORDEAUX 0xA000 #define AFRICA 0xAB21 // 0xce5f //0xAB21 // current dial color const int vlez = 34; #define DEG2RAD 0.0174532925 //int vlez; int sig = 0; int multiplier; int frametime = 100; int x_pos; int y_pos; int center_x = 120; // center x of dial on 240*240 TFT display int center_y = 120; // center y of dial on 240*240 TFT display float pivot_x, pivot_y,pivot_x_old, pivot_y_old; float p1_x,p1_y,p2_x,p2_y,p3_x, p3_y, p4_x, p4_y, p5_x, p5_y; float p1_x_old,p1_y_old, p2_x_old, p2_y_old, p3_x_old, p3_y_old; float p4_x_old, p4_y_old, p5_x_old, p5_y_old; float angleOffset = 3.14; float arc_x; float arc_y; int radius = 120; // center y of circular scale float angle_circle = 0; float needleAngle = 0; int iteration = 0; int j; float volt = 220; int needle_multiplier = 1; float needle_setter; float currentNeedleValue = 230; // Start with a base voltage or level float needleSpeed = 10; // Speed at which the needle returns to the left // to start with void setup() { //randomSeed (analogRead(0)); pinMode(12, OUTPUT); pinMode(vlez, INPUT); tft.begin(); Serial.begin (9600); Serial.println (""); Serial.println (""); tft.setRotation (0); tft.fillScreen (BLACK); tft.drawCircle (center_x, center_y,120, BLACK); pivot_x = center_x; pivot_y = center_y+50; p1_x_old = center_x; p1_y_old = center_y+50; p2_x_old = center_x; p2_y_old = center_y+50; p3_x_old = center_x; p3_y_old = center_y+50; p4_x_old = center_x; p4_y_old = center_y+50; p5_x_old = center_x; p5_y_old = center_y+30; create_dial (); needle_setter = volt; needleAngle = (((needle_setter)*DEG2RAD*1.8)-3.14); needle(); draw_pivot (); } void loop (){ // Map the analog input (voltage) to the needle range float targetNeedleValue = map(analogRead(vlez), 0, 400, 230, 270); Serial.println(targetNeedleValue); sig = analogRead(vlez); if (sig > 280) {digitalWrite(12, HIGH);} else {digitalWrite(12, LOW);} // If the target value is greater than the current needle position, move quickly if (targetNeedleValue > currentNeedleValue) { currentNeedleValue = targetNeedleValue; } // If the target value is lower, move more slowly to simulate damping else if (targetNeedleValue < currentNeedleValue) { currentNeedleValue -= needleSpeed; // Decrease the value gradually if (currentNeedleValue < targetNeedleValue) { currentNeedleValue = targetNeedleValue; // Ensure we don't overshoot } } // Update the needle position needle_setter = currentNeedleValue; needle(); draw_pivot(); delay(frametime); // Control the update rate } void needle (){ // dynamic needle management tft.drawLine (pivot_x, pivot_y, p1_x_old, p1_y_old, AFRICA); // remove old needle tft.fillTriangle (p1_x_old, p1_y_old, p2_x_old, p2_y_old, p3_x_old, p3_y_old, AFRICA); // remove old arrow head tft.fillTriangle (pivot_x, pivot_y, p4_x_old, p4_y_old, p5_x_old, p5_y_old, AFRICA); // remove old arrow head needleAngle = (((needle_setter)*0.01745331*1.8)-3.14); p1_x = (pivot_x + ((radius)*cos(needleAngle))); // needle tip p1_y = (pivot_y + ((radius)*sin(needleAngle))); p2_x = (pivot_x + ((radius-15)*cos(needleAngle-0.05))); // needle triange left p2_y = (pivot_y + ((radius-15)*sin(needleAngle-0.05))); p3_x = (pivot_x + ((radius-15)*cos(needleAngle+0.05))); // needle triange right p3_y = (pivot_y + ((radius-15)*sin(needleAngle+0.05))); p4_x = (pivot_x + ((radius-90)*cos(angleOffset+(needleAngle-0.2)))); // needle triange left p4_y = (pivot_y + ((radius-90)*sin(angleOffset+(needleAngle-0.2)))); p5_x = (pivot_x + ((radius-90)*cos(angleOffset+(needleAngle+0.2)))); // needle triange right p5_y = (pivot_y + ((radius-90)*sin(angleOffset+(needleAngle+0.2)))); p1_x_old = p1_x; p1_y_old = p1_y; // remember previous needle position p2_x_old = p2_x; p2_y_old = p2_y; p3_x_old = p3_x; p3_y_old = p3_y; p4_x_old = p4_x; p4_y_old = p4_y; // remember previous needle counterweight position p5_x_old = p5_x; p5_y_old = p5_y; tft.drawLine (pivot_x, pivot_y, p1_x, p1_y, BLACK); // create needle tft.fillTriangle (p1_x, p1_y, p2_x, p2_y, p3_x, p3_y, BLACK); // create needle tip pointer // tft.drawLine (center_x-80, center_y+70, center_x+80,center_y+70, BLACK); // repair floor tft.fillTriangle (pivot_x, pivot_y, p4_x, p4_y, p5_x, p5_y, BLACK); // create needle counterweight } void create_dial (){ tft.fillCircle (center_x, center_y,120, AFRICA); // general dial field tft.drawCircle (center_x, center_y,118,GREY); tft.drawCircle (center_x, center_y,117,BLACK); tft.drawCircle (center_x, center_y,116,BLACK); tft.drawCircle (center_x, center_y,115,GREY); for (j= 30; j<60 ; j+=5) { needleAngle = ((j*DEG2RAD*1.8)-3.14); arc_x = (pivot_x + ((radius+15)*cos(needleAngle))); // needle tip arc_y = (pivot_y + ((radius+15)*sin(needleAngle))); tft.drawPixel (arc_x,arc_y, BLACK); tft.fillCircle (arc_x,arc_y,2, BLACK); } for (j= 60; j<75 ; j+=5) { needleAngle = ((j*DEG2RAD*1.8)-3.14); arc_x = (pivot_x + ((radius+15)*cos(needleAngle))); // needle tip arc_y = (pivot_y + ((radius+15)*sin(needleAngle))); tft.drawPixel (arc_x,arc_y, RED); tft.fillCircle (arc_x,arc_y,2, RED); } tft.setTextColor (BLACK,AFRICA); tft.setTextSize (4); tft.setCursor (center_x+40, center_y+40); tft.print ("VU"); tft.setTextSize (4); tft.setCursor (center_x-60, center_y+40); tft.print ("R"); // tft.drawLine (center_x-80, center_y+70, center_x+80,center_y+70, WHITE); // create floor } void draw_pivot (){ tft.fillCircle (pivot_x, pivot_y,8,RED); tft.drawCircle (pivot_x, pivot_y,8,BLACK); tft.drawCircle (pivot_x, pivot_y,3,BLACK); }