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Expected completion time of this lab:

20 min

.

The analog input pins only support a voltage between 0 and 1.8V. NEVER apply a volyage outside that range, or you will fry the board.

Test the voltage of your input using a voltmeter before applying to the board.

For testing, you can leave the pin floating (the input voltage should be around 1V), or tied to ground.

Create the following Node-RED flow to enable analog input pin A0
dustcloud > Lab 43. Dashboard: analog input > image2017-4-20_0-51-3.png

The function node at the top contains the following code:

msg.payload            = {
    "method" :  "PUT",
    "url" :     "/analog/A0",
    "body":     {
        "enable":      msg.payload,
        "rate":        10000,
        "sampleCount": 1,
        "dataFormat":  0
    },
    "token":    "myToken",
}
return msg;

You should end up with the following dashboard

Create little control loops between sensors and actuators!