EZO pH flow for Calibration and readings

A dashboard UI based flow to allow calibration and reading of the Atlas Scientific EZO pH device. Although this device can communication over both I2C and Serial, this flow is designed around serial communication.

General Operation

The UI has two pages, one ('Main' tab) for displaying the pH value from the probe and if setup in the flow a temperature reading from a temperature probe ( Please see 'comment' node about temperature compensation). The other ('Calibration' tab) is used to calibrate the EZO pH probe and setup the reading rate if you have the correct firmware on your device.

There are several 'Comment' nodes in the flow which aid in setup and a description of what each section does.Also it is worth downloading the EZO ph datasheet from Atlas Scientific. This will give you a good idea of all the function of the unit.

Please note:

This flow is part of several flows used in my aquarium for monitoring and control. This flow is really a 'Get you started' flow for your own Ezo pH unit. The calibration steps in particular are just memory joggers and I would recommend clicking through the sets first with no device connected to get an idea of how it works.

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  case \"*OV\":\n            msg.payload = \"Over voltage (Vcc >= 5.5v)\";\n            break;\n        case \"*UV\":\n            msg.payload = \"Under voltage (Vcc <= 3.1v)\";\n            break;\n        case \"*RS\":\n            msg.payload = \"Unit has reset\";\n            break;\n        case \"*RE\":\n            msg.payload = \"Boot up complete, Ready\";\n            break;\n        case \"*SL\":\n            msg.topic = \"OK\";\n            msg.payload = \"Entering Sleep Mode\";\n            break;\n        case \"*WA\":\n            msg.topic = \"OK\";\n            msg.payload = \"Unit waking up\";\n            break;\n    }\n\n    return [msg,null];\n}else{\n    \n    msg1.payload=parseFloat(temp);\n    msg1.topic=\"pH\";\n    return 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}\n}","outputs":1,"noerr":0,"x":616.5,"y":1039.7666015625,"wires":[["a2c54d5f.298b18"]]},{"id":"dd7e4447.1351a","type":"ui_gauge","z":"4703de07.5f73f","name":"PH","group":"8b0f9e98.0495a8","order":1,"width":"0","height":"0","gtype":"gage","title":"pH","label":"","format":"{{value | number:2}}","min":"1","max":"10","colors":["#ca3838","#008f00","#0200b7"],"seg1":"","seg2":"","x":995.25,"y":1160.75,"wires":[]},{"id":"1b44c4a1.31919b","type":"comment","z":"4703de07.5f73f","name":"Serial commands","info":"Commands for the Ezo pH unit over serial can be found\nin the pH_EZO datasheet.\nSerial send Node:\n\nOn itial copying of flow the Serial node will need setup:\n\nUse 'Search' symbol in node setup to find your serial port\non your device.ie /dev/usb:9600-8N1 or similar.\n\nBaud: 9600\nData bits: 8\nParity: None\nStop bits: 1\nSplit input: on the character  -then enter 0x0D in box\nand delivery: ascii string\n\nMake sure that both input and output Serial nodes have the\nsame configured 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