spi support adc 3008

slave/package.json

@@ -8,7 +8,8 @@
           "raw-body":  "1.x",
               "cors":  "2.4.1",
            "pi-gpio":  "0.0.6",
-        "superagent":  "0.18.2"
+        "superagent":  "0.18.2",
+        "adc-pi-spi":  "0.0.1"
   },
   "engines": {
          "node":  "0.10.x"

slave/spiADCServer.js

@@ -0,0 +1,22 @@
+ADC = require ('adc-pi-spi');
+options = {
+  tolerance: 10,
+  pollInterval: 200,
+  channels: [0, 1, 2, 3]
+}
+adc=new ADC('/dev/spidev0.0', options);
+
+adc.on ('change', function(channel, value){
+  console.log('channel ', channel, 'is now', value);
+  readValues();
+});
+
+process.on('SIGTERM', function() {
+  adc.close();});
+
+function readValues() {
+  adc.read(0, function (data) {
+    console.log("value is ----------------------", data);
+  });
+}
+