mirror of https://github.com/espruino/BangleApps
59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
// history of temperature/pressure readings
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var history = [];
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// When we get temperature...
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function onTemperature(p) {
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// Average the last 5 temperature readings
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while (history.length>4) history.shift();
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history.push(p);
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var avrTemp = history.reduce((i,h)=>h.temperature+i,0) / history.length;
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var avrPressure = history.reduce((i,h)=>h.pressure+i,0) / history.length;
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var t = require('locale').temp(avrTemp).replace("'","°");
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// Draw
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var rect = Bangle.appRect;
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g.reset(1).clearRect(rect.x, rect.y, rect.x2, rect.y2);
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var x = (rect.x+rect.x2)/2;
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var y = (rect.y+rect.y2)/2 + 10;
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g.setFont("6x15").setFontAlign(0,0).drawString("Temperature:", x, y - 65);
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g.setFontVector(50).setFontAlign(0,0).drawString(t, x, y-25);
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g.setFont("6x15").setFontAlign(0,0).drawString("Pressure:", x, y+15 );
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g.setFont("12x20").setFontAlign(0,0).drawString(Math.round(avrPressure)+" hPa", x, y+40);
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// Set Bluetooth Advertising
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// https://bthome.io/format/
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var temp100 = Math.round(avrTemp*100);
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var pressure100 = Math.round(avrPressure*100);
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var advert = [ 0x40, /* BTHome Device Information
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bit 0: "Encryption flag"
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bit 1-4: "Reserved for future use"
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bit 5-7: "BTHome Version" */
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0x01, // Battery, 8 bit
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E.getBattery(),
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0x02, // Temperature, 16 bit
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temp100&255,temp100>>8,
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0x04, // Pressure, 16 bit
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pressure100&255,(pressure100>>8)&255,pressure100>>16
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];
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require("ble_advert").set(0xFCD2, advert);
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}
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// Gets the temperature in the most accurate way with pressure sensor
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function drawTemperature() {
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Bangle.getPressure().then(p =>{if (p) onTemperature(p);});
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}
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setInterval(function() {
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drawTemperature();
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}, 10000); // update every 10s
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Bangle.loadWidgets();
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Bangle.setUI({
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mode : "custom",
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back : function() {load();}
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});
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E.showMessage("Reading temperature...");
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drawTemperature();
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