Initial draft

README.md

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+# OpenBCI Experimenter
+
+Node.js app for recording experiments based on OpenBCI Data samples
+
+This project is under development, this is just a first draft.
+
+## Setup
+
+* npm install
+* Plug in OpenBCI dongle
+* Turn on OpenBCI board
+* Run:
+
+``` bash
+node experimenter with [subject_name] about [keyword] for [time_milliseconds]
+```
+
+The recorded JSON data for experiments can be found at ./data/[keyword].json

experiment.js

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+var path = require('path');
+var fs = require('fs');
+var argv = require('yargs').argv;
+var jsonfile = require('jsonfile');
+var OpenBCIBoard = require('openbci-sdk');
+
+// Experiment Model
+var experiment = {
+    name: argv._[3],
+    subject: argv._[1],
+    duration: argv._[5],
+    filePath: path.join(__dirname, 'data', argv._[3] + '-' + argv._[1] + '.json'),
+    patternsTotal: 0,
+    patterns: []
+};
+
+console.log(experiment);
+
+// OpenBCI
+
+const board = new OpenBCIBoard.OpenBCIBoard();
+
+board.autoFindOpenBCIBoard()
+    .then(onBoardFind);
+
+// Board find handler
+function onBoardFind (portName) {
+    if (portName) {
+        console.log('board found', portName);
+        board.connect(portName)
+            .then(onBoardConnect);
+    }
+}
+
+// Board connect handler
+function onBoardConnect () {
+    board.on('ready', onBoardReady);
+}
+
+// Board ready handler
+function onBoardReady () {
+    console.log(experiment.name + ' experiment started');
+    board.streamStart();
+    board.on('sample', addPattern);
+    setTimeout(endExperiment, experiment.duration);
+}
+
+// Add pattern
+function addPattern (sample) {
+    var pattern = {
+        input: {},
+        output: {}
+    };
+    sample.channelData.forEach(function (channel, index) {
+        pattern.input[index + 1] = channel;
+    });
+    pattern.output[experiment.name] = 1;
+    experiment.patternsTotal++;
+    experiment.patterns.push(pattern);
+    console.log('pattern', pattern);
+}
+
+// End Experiment
+function endExperiment () {
+    board.streamStop()
+        .then(board.disconnect());
+    jsonfile.writeFile(experiment.filePath, experiment, { spaces: 2 }, function (error) {
+        if (!error) {
+            console.log(experiment.name + ' experiment finished with ' + experiment.patternsTotal  + ' patterns');
+            console.log('Experiment path: ' + experiment.filePath);
+        } else {
+            console.log(experiment.name + ' experiment failed. sucks to be you.');
+        }
+    });
+}
+
+

package.json

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+{
+  "name": "openbci-experimenter",
+  "private": false,
+  "version": "0.0.1",
+  "description": "Node.js app for recording experiments based on OpenBCI data samples",
+  "main": "experimenter.js",
+  "license": "MIT",
+  "keywords": [
+    "openbci",
+    "experiment",
+    "machine-learning"
+  ],
+  "author": "Alex Castillo",
+  "scripts": {
+  },
+  "dependencies": {
+    "jsonfile": "^2.2.3",
+    "openbci-sdk": "^0.2.0",
+    "yargs": "^4.3.2"
+  }
+}