135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
/*
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An example analogue clock using a TFT LCD screen to show the time
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use of some of the drawing commands with the ST7735 library.
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For a more accurate clock, it would be better to use the RTClib library.
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But this is just a demo.
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Uses compile time to set the time so a reset will start with the compile time again
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Gilchrist 6/2/2014 1.0
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Updated by Bodmer
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*/
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#include <TFT_eSPI.h> // Graphics and font library for ST7735 driver chip
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#include <SPI.h>
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TFT_eSPI tft = TFT_eSPI(); // Invoke library, pins defined in User_Setup.h
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#define TFT_GREY 0xBDF7
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float sx = 0, sy = 1, mx = 1, my = 0, hx = -1, hy = 0; // Saved H, M, S x & y multipliers
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float sdeg=0, mdeg=0, hdeg=0;
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uint16_t osx=64, osy=64, omx=64, omy=64, ohx=64, ohy=64; // Saved H, M, S x & y coords
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uint16_t x0=0, x1=0, yy0=0, yy1=0;
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uint32_t targetTime = 0; // for next 1 second timeout
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static uint8_t conv2d(const char* p) {
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uint8_t v = 0;
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if ('0' <= *p && *p <= '9')
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v = *p - '0';
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return 10 * v + *++p - '0';
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}
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uint8_t hh=conv2d(__TIME__), mm=conv2d(__TIME__+3), ss=conv2d(__TIME__+6); // Get H, M, S from compile time
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boolean initial = 1;
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void setup(void) {
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tft.init();
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tft.setRotation(0);
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tft.fillScreen(TFT_GREY);
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tft.setTextColor(TFT_GREEN, TFT_GREY); // Adding a black background colour erases previous text automatically
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// Draw clock face
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tft.fillCircle(64, 64, 61, TFT_BLUE);
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tft.fillCircle(64, 64, 57, TFT_BLACK);
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// Draw 12 lines
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for(int i = 0; i<360; i+= 30) {
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sx = cos((i-90)*0.0174532925);
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sy = sin((i-90)*0.0174532925);
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x0 = sx*57+64;
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yy0 = sy*57+64;
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x1 = sx*50+64;
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yy1 = sy*50+64;
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tft.drawLine(x0, yy0, x1, yy1, TFT_BLUE);
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}
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// Draw 60 dots
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for(int i = 0; i<360; i+= 6) {
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sx = cos((i-90)*0.0174532925);
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sy = sin((i-90)*0.0174532925);
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x0 = sx*53+64;
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yy0 = sy*53+64;
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tft.drawPixel(x0, yy0, TFT_BLUE);
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if(i==0 || i==180) tft.fillCircle(x0, yy0, 1, TFT_CYAN);
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if(i==0 || i==180) tft.fillCircle(x0+1, yy0, 1, TFT_CYAN);
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if(i==90 || i==270) tft.fillCircle(x0, yy0, 1, TFT_CYAN);
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if(i==90 || i==270) tft.fillCircle(x0+1, yy0, 1, TFT_CYAN);
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}
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tft.fillCircle(65, 65, 3, TFT_RED);
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// Draw text at position 64,125 using fonts 4
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// Only font numbers 2,4,6,7 are valid. Font 6 only contains characters [space] 0 1 2 3 4 5 6 7 8 9 : . a p m
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// Font 7 is a 7 segment font and only contains characters [space] 0 1 2 3 4 5 6 7 8 9 : .
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tft.drawCentreString("Time flies",64,130,4);
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targetTime = millis() + 1000;
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}
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void loop() {
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if (targetTime < millis()) {
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targetTime = millis()+1000;
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ss++; // Advance second
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if (ss==60) {
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ss=0;
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mm++; // Advance minute
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if(mm>59) {
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mm=0;
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hh++; // Advance hour
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if (hh>23) {
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hh=0;
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}
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}
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}
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// Pre-compute hand degrees, x & y coords for a fast screen update
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sdeg = ss*6; // 0-59 -> 0-354
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mdeg = mm*6+sdeg*0.01666667; // 0-59 -> 0-360 - includes seconds
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hdeg = hh*30+mdeg*0.0833333; // 0-11 -> 0-360 - includes minutes and seconds
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hx = cos((hdeg-90)*0.0174532925);
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hy = sin((hdeg-90)*0.0174532925);
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mx = cos((mdeg-90)*0.0174532925);
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my = sin((mdeg-90)*0.0174532925);
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sx = cos((sdeg-90)*0.0174532925);
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sy = sin((sdeg-90)*0.0174532925);
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if (ss==0 || initial) {
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initial = 0;
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// Erase hour and minute hand positions every minute
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tft.drawLine(ohx, ohy, 65, 65, TFT_BLACK);
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ohx = hx*33+65;
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ohy = hy*33+65;
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tft.drawLine(omx, omy, 65, 65, TFT_BLACK);
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omx = mx*44+65;
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omy = my*44+65;
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}
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// Redraw new hand positions, hour and minute hands not erased here to avoid flicker
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tft.drawLine(osx, osy, 65, 65, TFT_BLACK);
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tft.drawLine(ohx, ohy, 65, 65, TFT_WHITE);
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tft.drawLine(omx, omy, 65, 65, TFT_WHITE);
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osx = sx*47+65;
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osy = sy*47+65;
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tft.drawLine(osx, osy, 65, 65, TFT_RED);
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tft.fillCircle(65, 65, 3, TFT_RED);
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}
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}
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