node-red-nodes/hardware/Arduino/35-arduino.html

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    <p>Arduino input node. Connects to a local Arduino and monitors the selected pin for changes. Uses <a href="http://firmata.org/" target="_new"><i>Firmata</i>.</a></p>
    <p>The Arduino must be loaded with the Standard Firmata sketch available in the Arduino examples.</p>
    <p>You can select either Digital or Analogue input. Outputs the value read as <code>msg.payload</code> and the pin number as <code>msg.topic</code>.</p>
    <p>It only outputs on a change of value - fine for digital inputs, but you can get a lot of data from analogue pins which you must then handle.</p>
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<script type="text/x-red" data-help-name="arduino out">
    <p>Arduino output node. Connects to local Arduino and writes to the selected digital
    pin. Uses <a href="http://firmata.org/" target="_new"><i>Firmata</i>.</a></p>
    <p>The Arduino must be loaded with the Standard Firmata sketch available in the Arduino examples.</p>
    <p>You can select Digital, Analogue (PWM) or Servo type outputs. Expects an integer numeric
    value in <code>msg.payload</code>. The pin number is set in the properties panel.</p>
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