UK power consumption to Twitter
Get real-time UK power consumption from http://realtimeweb-prod.nationalgrid.com/SystemData.aspx then Tweet with some description.
[{"id":"5d138f6c.a2ec7","type":"inject","name":"","topic":"","payload":"","payloadType":"date","repeat":"300","crontab":"","once":false,"x":743,"y":152,"z":"c3aed0d3.3ce58","wires":[["496fa39e.b6905c"]]},{"id":"496fa39e.b6905c","type":"http request","name":"","method":"GET","ret":"txt","url":"http://realtimeweb-prod.nationalgrid.com/SystemData.aspx","x":910,"y":205,"z":"c3aed0d3.3ce58","wires":[["14d4cb5.feb2b35"]]},{"id":"14d4cb5.feb2b35","type":"function","name":"UK electricity","func":"if (~msg.payload.indexOf('<span')) {\n var words = msg.payload.split(\"<p\")[1].split(\"ContentPlaceHolder1\");\n if (words.length >= 3) {\n msg.payload = {};\n msg.payload.demand = parseInt(words[1].split(\">\")[1]);\n msg.payload.frequency = parseFloat(words[3].split(\">\")[1]);\n msg.payload.time = words[2].split(\">\")[1];\n\n // Create the true/false signal based on the frequency.\n frq50 = {};\n frq50.payload = (msg.payload.frequency >= 50) ? true : false;\n\n\tvar toTweet = {};\n\ttoTweet.payload = \"UK power consumption \" + msg.payload.demand +\"MW\" \n\t\t\t\t\t\t+ \" at \" + msg.payload.time.split(\"<\")[0] + \"\\n\"+\n\t\t\t\t\t\t\" (Tweet from Node-RED on Raspberry Pi)\";\n\t\n return [msg,frq50,toTweet];\n }\n}","outputs":"3","x":1070,"y":112,"z":"c3aed0d3.3ce58","wires":[["b14aa289.4eb56"],["6a27e576.95d81c"],["3c9c78bb.c36388"]]},{"id":"b14aa289.4eb56","type":"debug","name":"","active":true,"console":"false","complete":"false","x":1247,"y":45,"z":"c3aed0d3.3ce58","wires":[]},{"id":"6a27e576.95d81c","type":"debug","name":"","active":true,"console":"false","complete":"false","x":1259,"y":99,"z":"c3aed0d3.3ce58","wires":[]},{"id":"3c9c78bb.c36388","type":"twitter out","twitter":"","name":"Tweet","x":1255,"y":179,"z":"c3aed0d3.3ce58","wires":[]}]
