Add pullup option to Arduino digital input

to Close #455

hardware/Arduino/35-arduino.html

@@ -6,8 +6,9 @@
     </div>
     <div class="form-row">
         <label for="node-input-state"><i class="fa fa-wrench"></i> <span data-i18n="arduino.label.type"></span></label>
-        <select type="text" id="node-input-state" style="width: 150px;">
+        <select type="text" id="node-input-state" style="width:200px;">
             <option value="INPUT" data-i18n="arduino.state.in.digital"></option>
+            <option value="PULLUP" data-i18n="arduino.state.in.pullup"></option>
             <option value="ANALOG" data-i18n="arduino.state.in.analogue"></option>
             <option value="STRING" data-i18n="arduino.state.in.string"></option>
         </select>
@@ -66,7 +67,7 @@
     </div>
     <div class="form-row">
         <label for="node-input-state"><i class="fa fa-wrench"></i> <span data-i18n="arduino.label.type"></span></label>
-        <select type="text" id="node-input-state" style="width: 200px;">
+        <select type="text" id="node-input-state" style="width:200px;">
             <option value="OUTPUT" data-i18n="arduino.state.out.digital"></option>
             <option value="PWM" data-i18n="arduino.state.out.analogue"></option>
             <option value="SERVO" data-i18n="arduino.state.out.servo"></option>

hardware/Arduino/35-arduino.js

@@ -78,6 +78,15 @@ module.exports = function(RED) {
                         }
                     });
                 }
+                if (node.state === "PULLUP") {
+                    node.board.pinMode(node.pin, 0x0B);
+                    node.board.digitalRead(node.pin, function(v) {
+                        if (v !== node.oldval) {
+                            node.oldval = v;
+                            node.send({payload:v, topic:node.pin});
+                        }
+                    });
+                }
                 if (node.state == "STRING") {
                     node.board.on('string', function(v) {
                         if (v !== node.oldval) {

hardware/Arduino/README.md

@@ -23,7 +23,7 @@ details and examples of how to use this node.
 
 Connects to local Arduino and monitors the selected pin for changes.
 
-You can select either **Digital**, **Analogue**, or **String** input type.
+You can select either **Digital**, **Pullup**, **Analogue**, or **String** input type.
 Outputs the value read as `msg.payload` and the pin number as `msg.topic`.
 
 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. For example you could use a `delay` node set to rate limit and drop intermediate values, or an `rbe` node to only report when it changes by a certain amount.

hardware/Arduino/locales/en-US/35-arduino.json

@@ -18,6 +18,7 @@
         "state": {
             "in": {
                 "digital": "Digital pin",
+                "pullup": "Digital pin with pullup",
                 "analogue": "Analogue pin",
                 "string": "String"
             },

hardware/Arduino/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-arduino",
-    "version"       : "0.0.17",
+    "version"       : "0.0.18",
     "description"   : "A Node-RED node to talk to an Arduino running firmata",
     "dependencies"  : {
         "firmata"   : "~0.19.1"