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Using ElectricImp to pilot LPD8806 ledstrip from a webpage
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| function requestHandler(request, response) { | |
| try { | |
| if ("color" in request.query) { | |
| local ledState = request.query.color.tointeger(); | |
| local sleep=10; | |
| if ("sleep" in request.query){ | |
| sleep = request.query.sleep.tointeger(); | |
| } | |
| params<-{"color":ledState,"sleepTime":sleep}; | |
| device.send("color",params ); | |
| } | |
| if("white"in request.query){ | |
| device.send("white", request.query.white.tointeger() ); | |
| } | |
| response.header("Access-Control-Allow-Origin", "*"); | |
| response.header("Access-Control-Allow-Methods", "GET"); | |
| response.send(200, "OK"); | |
| } catch (ex) { | |
| response.send(500, "Internal Server Error: " + ex); | |
| } | |
| } | |
| // register the HTTP handler | |
| http.onrequest(requestHandler); |
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| /* | |
| EImp 1m LedStrip | |
| Pin5 -> CI | |
| Pin7 -> DI | |
| */ | |
| hardware.spi257.configure(SIMPLEX_TX | MSB_FIRST | CLOCK_IDLE_LOW, 4000); | |
| local data=blob(32*3+1); | |
| local curColor = 127; | |
| local curWhite = 0; | |
| imp.sleep(0.3); | |
| server.log("init"); | |
| function clear() { | |
| full(127,127,127); | |
| full(0,0,0); | |
| } | |
| function full(r,g,b) { | |
| for(local pixel=0;pixel<32;pixel++){ | |
| data[(pixel*3)]= 0x80 | g; | |
| data[(pixel*3)+1]= 0x80 | r; | |
| data[(pixel*3)+2]= 0x80 | b; | |
| } | |
| data[32*3]=0x00; | |
| hardware.spi257.write(data); | |
| } | |
| function update() { | |
| hardware.spi257.write(data); | |
| } | |
| function setPixel(pixel,r,g,b) { | |
| data[(pixel*3)]= 0x80 | g; | |
| data[(pixel*3)+1]= 0x80 | r; | |
| data[(pixel*3)+2]= 0x80 | b; | |
| } | |
| function wheel(pixel,WheelPos){ | |
| local r, g, b; | |
| switch(WheelPos / 128) | |
| { | |
| case 0: | |
| r = 127 - WheelPos % 128; //Red down | |
| g = WheelPos % 128; // Green up | |
| b = 0; //blue off | |
| break; | |
| case 1: | |
| g = 127 - WheelPos % 128; //green down | |
| b = WheelPos % 128; //blue up | |
| r = 0; //red off | |
| break; | |
| case 2: | |
| b = 127 - WheelPos % 128; //blue down | |
| r = WheelPos % 128; //red up | |
| g = 0; //green off | |
| break; | |
| } | |
| setPixel(pixel,r,g,b); | |
| } | |
| function fullWheel(wheelPos) { | |
| for(local pixel=0;pixel<32;pixel++){ | |
| wheel(pixel,wheelPos); | |
| } | |
| update(); | |
| } | |
| clear(); | |
| function slide(params){ | |
| local newColor = params["color"]; | |
| if(curColor!=newColor){ | |
| local sleepTime = params["sleepTime"]; | |
| server.log("slide to : "+newColor+" with "+sleepTime+" ms delay"); | |
| local incr=1; | |
| if(newColor<curColor) | |
| incr=-1; | |
| for(;curColor!=newColor;curColor+=incr){ | |
| fullWheel(curColor); | |
| imp.sleep(sleepTime/1000.0); | |
| } | |
| server.log("done sliding"); | |
| } | |
| } | |
| function white(value){ | |
| if(curWhite!=value ){ | |
| local incr=1; | |
| if(value<curWhite) | |
| incr=-1; | |
| for(;curWhite!=value;curWhite+=incr){ | |
| full(curWhite,curWhite,curWhite); | |
| imp.sleep(0.02); | |
| } | |
| } | |
| } | |
| agent.on("color", slide); | |
| agent.on("white", white); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>ElectricImp Test</title> | |
| <script src='http://code.jquery.com/jquery-2.0.3.min.js'></script> | |
| </head> | |
| <style> | |
| </style> | |
| <body> | |
| <div> | |
| <label>Type</label> | |
| <input type="radio" name="usetype" value="white" checked> | |
| Monochrome</input> | |
| <input type="radio" name="usetype" value="color"> | |
| Color</input> | |
| </div> | |
| <label>Value</label> | |
| <input type="range" id="sliderBar" min="0" max="127" step="1" value="0"> | |
| <script> | |
| $(function() { | |
| var currentValue = $('#sliderBar').val(); | |
| setInterval(function() { | |
| if (currentValue != $('#sliderBar').val()) { | |
| if ($('input:radio[name=usetype]')[0].checked) { | |
| $.get('https://agent.electricimp.com/<YOUROWNAGENTID>?white=' + $('#sliderBar').val()); | |
| } else { | |
| $.get('https://agent.electricimp.com/<YOUROWNAGENTID>?color=' + 2 * $('#sliderBar').val()); | |
| } | |
| } | |
| }, 500); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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