47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
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/*
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* SCREENSAVER: bounces a nice little text over the screen
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*/
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// offsets must be defined for correct display on screen!
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const Xoffset = 8;
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const Yoffset = 8;
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// define the function first, before using it below
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function displayText(textString, x,y) {
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// write some text
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scrn.drawString(textString, Xoffset + x, Yoffset + y);
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// write to the screen
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scrn.flip();
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// clear a bit of the screen in preparation before next update
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scrn.clearRect(Xoffset + x, Yoffset + y, Xoffset + x + 30, Yoffset + y + 8);
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}
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// MAIN FUNCTION: bounce text and flash LED (D8)
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let on = false;
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let x = 0;
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let y = 0;
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let ix = 1;
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let iy = 1;
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const txt = 'HELLO';
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function main() {
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setInterval(function() {
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on = !on;
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digitalWrite("D8",on);
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y += iy;
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x += ix;
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if (x > (72-(txt.length*8))) ix = -ix;
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if (y > 34) iy = -iy;
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if (x < 1) ix = -ix;
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if (y < 1) iy = -iy;
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displayText(txt,x,y);
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}, 100);
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}
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//
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// required modules/libraries (in Espruino must be included at the end due to needing functions)
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//
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I2C1.setup({scl:"D6",sda:"D5"}); // I2C setup
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// initialize the screen and its dimensions (null can be replaced by a callback)
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const scrn = require("SSD1306").connect(I2C1, main, { width:72, height:48 }); // for 72x48 LCD
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