Iot Mini-Project
here we are creating a mini-project of iot. It is based on temperature and humidity
[{"id":"a147cd02.5eb83","type":"function","name":"Parse METAR","func":"var METARdata = msg.payload.response.data[0].METAR[0];\nvar windkt = METARdata.wind_speed_kt[0];\nvar windkph = (windkt*1.852);\nvar gusts = windkt; //if wind_gust_kt is not present, value defaults to wind_speed_kt\n if (typeof METARdata.wind_gust_kt != \"undefined\") {\n\t gusts = METARdata.wind_gust_kt[0];\n }\nvar altim = METARdata.altim_in_hg[0];\nvar pressure = Math.round(altim * 33.8637526); //convert hg to mb\nvar dew = METARdata.dewpoint_c[0];\ndew = Math.round(dew);\nvar tempC = METARdata.temp_c[0];\nvar tempF = ((tempC*1.8)+32);\n\n//tempC=5;\n//dew = 15;\n//windkt=1;\n\n//August-Roche-Magnus approximation to calculate rh_hum\nvar constA = 17.625;\nvar constB = 243.04;\nvar rh_numer = 10000.0*Math.exp((constA*eval(dew))/(eval(dew)+constB));\nvar rh_denom = Math.exp((constA*eval(tempC))/(eval(tempC)+constB));\nvar rh_hum = (rh_numer/rh_denom);\nvar humidityemon = Math.round(rh_hum);\nvar humidity = (humidityemon/100);\n\n//Wind Chill Index Calculations using the 'Joint Action Group for Temp Indices' (JAG TI) formula\nvar chill=(13.12+0.6215*tempC-11.37*Math.pow(windkph,0.16)+0.3965*tempC*Math.pow(windkph,0.16));\n\n//Calculate Apparent Temperature\n//firstly, Calculate Vapor pressure in kPa\nvar vaporp = ((6.11*Math.pow(10,(7.5*dew/(237.3 + dew))))/10);\n//apply Steadman's Apparent Temperature formula\nvar apptemp = -2.7+(1.04*tempC)+(2*vaporp)-(windkt*0.3343886);\n \n//Calculation of 'feels like' temperature by using the 'chill factor' if\n//the temp is below 10degC, or 'apparent temp' if over 20degC, or if between\n//10 and 20degC using a linear interpolation of both.\nvar feels;\nif (tempC < 10.0) {\n\tfeels=chill;\n\t}\n\telse if (tempC > 20.0) {\n\tfeels=apptemp;\n\t}\n\t\telse {\n\t\tvar calcA=((tempC-10)/10);\n\t\tvar calcB=1-calcA;\n\t\tfeels=((apptemp*calcA)+(chill*calcB));\n\t\t}\n\t\t\tfeels=Math.round(feels*100);\n\t\t\nmsg.payload = ((windkt) + (\",\") + (gusts) + (\",\") + (humidityemon) + (\",\") + (pressure) + (\",\") + (feels));\nreturn msg;","outputs":1,"x":578,"y":440,"z":"3f1992f2.c0e66e","wires":[["c40dd6c1.3bf228","37138490.c8ec7c"]]}]
