SDS011 Air Quality Sensor with usb-uart adapter

README.md

inova fitness SDS011 Air Quality Sensor with usb-uart adapter

flow.json

[{"id":"9090c1f9.4246d","type":"serial in","z":"2d8cb920.81f3a6","name":"USB UART RX","serial":"135cce08.b651f2","x":100,"y":80,"wires":[["ca7ea92e.3dcf48"]]},{"id":"ca7ea92e.3dcf48","type":"function","z":"2d8cb920.81f3a6","name":"Read Dust concentration","func":"var str = msg.payload.toString('hex');\nvar int = parseInt(str, 16);\nif (str == 'aa')\n    {\n        context.set('PmBuffer',msg.payload);\n        context.set('count',1);\n        context.set('checksumm',0);\n    }\n    else\n    {\n        var PmBuffer = Buffer.concat([context.get('PmBuffer'),msg.payload]);\n        context.set('PmBuffer',PmBuffer);\n        var count = context.get('count');\n        var checksumm = context.get('checksumm');\n        count += 1;\n        context.set('count',count);\n        if (count == 3)\n            context.set('pm25',int);\n        if (count == 4)\n            context.set('pm25',context.get('pm25')+int*256);\n        if (count == 5)\n            context.set('pm10',int);\n        if (count == 6)\n            context.set('pm10',context.get('pm10')+int*256);\n        if (count > 2 && count < 9)\n        {\n            checksumm += int;\n            context.set('checksumm',checksumm);\n        }\n        if (count == 9)\n            context.set('checksum8',int);\n        if ((count == 10) && (str == 'ab'))\n        {\n            msg.payload = {};\n            msg.payload.pm25 = context.get('pm25')/10;\n            msg.payload.pm10 = context.get('pm10')/10;\n            msg.payload.buffer = PmBuffer;\n            msg.payload.checksumcalculated = checksumm % 256;\n            msg.payload.checksummsg = context.get('checksum8');\n            if (msg.payload.checksumcalculated == msg.payload.checksummsg)\n                return [ msg,   {\"payload\":msg.payload.pm25}  ,   {\"payload\":msg.payload.pm10}  ];\n            else\n                return [ {\"payload\":\"Wrong CheckSumm\"},   null ,   null  ];\n        }\n}\n//The number of bytes Name Content\n// 0 Message header AA\n// 1 Commander No. C0\n// 2 DATA 1 PM2.5 Low byte\n// 3 DATA 2 PM2.5 High byte\n// 4 DATA 3 PM10 Low byte\n// 5 DATA 4 PM10 High byte\n// 6 DATA 5 ID byte 1\n// 7 DATA 6 ID byte 2\n// 8 Check-sum Check-sum\n// 9 Message tail AB\n","outputs":3,"noerr":0,"x":390,"y":80,"wires":[["f872cde7.3677b"],["d30975c2.004fa8"],["bf82c2e.9519f4"]]},{"id":"a847d0e7.5ddf","type":"comment","z":"2d8cb920.81f3a6","name":"SDS011 laser PM2.5 sensor","info":"SDS011 laser PM2.5 sensor MANUAL\nhttps://pan.baidu.com/s/1skCk8AL","x":140,"y":40,"wires":[]},{"id":"f872cde7.3677b","type":"debug","z":"2d8cb920.81f3a6","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","x":590,"y":40,"wires":[]},{"id":"d30975c2.004fa8","type":"debug","z":"2d8cb920.81f3a6","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":610,"y":80,"wires":[]},{"id":"bf82c2e.9519f4","type":"debug","z":"2d8cb920.81f3a6","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":610,"y":120,"wires":[]},{"id":"135cce08.b651f2","type":"serial-port","z":"","serialport":"/dev/tty.SLAB_USBtoUART","serialbaud":"9600","databits":"8","parity":"none","stopbits":"1","newline":"","bin":"bin","out":"char","addchar":false}]