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November 20, 2019 16:44
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PowerPoint presenter using a Puck.js beacon's button and magnetic sensor.
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| var kb = require("ble_hid_keyboard"); | |
| NRF.setServices(undefined, { hid : kb.report }); | |
| var next = "n"; | |
| var prev = "p"; | |
| function sendPrev(){ | |
| sendCharPrev(); | |
| LED2.set(); | |
| setTimeout("LED2.reset()",1000); | |
| } | |
| function sendNext(){ | |
| if(Puck.magOn() === true){ | |
| // stay put, do nothing | |
| } else if(Puck.magOn() === false) { | |
| Puck.magOn(); // turn on magnetic sensor only if off | |
| } | |
| sendCharNext(); | |
| LED2.set(); | |
| setTimeout("LED2.reset()",1000); | |
| } | |
| function sendCharNext(){ | |
| if (next == next.toLowerCase()){ | |
| sk = 0; | |
| } else { | |
| sk = 0x02;} | |
| // send the "n" keyboard character | |
| kb.tap(kb.KEY[next.toUpperCase()], sk); | |
| } | |
| function sendCharPrev(){ | |
| if (prev == prev.toLowerCase()){ | |
| sk = 0; | |
| } else { | |
| sk = 0x02;} | |
| // send the "p" keyboard character | |
| kb.tap(kb.KEY[prev.toUpperCase()], sk); | |
| } | |
| // watch the button press, action happens on button release (rising) | |
| // debounce set to 50 to prevent unintended mechanical "bounce" triggers | |
| setWatch(function(e) { | |
| sendNext(); // fire the "n" character | |
| }, BTN, {edge:"rising", debounce:50, repeat:true}); | |
| // trigger the "p" character when the x magnetic axis value is over 0 | |
| Puck.on('mag', function(value) { | |
| if(value.x > 0){ | |
| sendPrev(); // fire the "p" character | |
| } | |
| }); | |
| // turn off magnetic sensor after 30 minutes to save power | |
| setTimeout(function(){ Puck.magOff(); }, 1800000); |
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