Tessel Camera

Take pictures with a Tessel! Press a button on Tessel to take a picture and upload it to your computer.

UPDATE: Now also includes code to automatically upload the photo taken to Twitter over Tessel's wifi, all with the press of a button!

Also view & easily download code for this project at its Tessel Project Page.

This setup uses:

  • Tessel
  • Camera module
  • USB cable
  • Computer (for programming)
  • Battery (if you want to disconnect from your computer to use it)

    Plug in the camera module to Port A on the Tessel, and then plug the Tessel in to the USB port of your computer.

    Step 1: Upload code, take pictures!

    Tessel Camera
    Tessel Camera

    Here is the code you need:

    // Require libraries
    var tessel = require('tessel'); var camera = require('camera-vc0706').use(tessel.port['A']); // Set up an LED to notify when we're taking a picture var notificationLED = tessel.led[3]; // When the camera is ready, print a message in the console. camera.on('ready', function () { console.log('Press the config button to take a picture!'); }); // When we press a button... tessel.button.on('press', function() { notificationLED.high(); // Take the picture camera.takePicture(function(err, image) { if (err) { console.log('error taking image', err); } else { notificationLED.low(); // Name the image var name = 'picture-' + Math.floor(Date.now()*1000) + '.jpg'; // Save the image console.log('Picture saving as', name, '...'); process.sendfile(name, image); console.log('Picture saved.'); } }); }); // If there is an error, report it. camera.on('error', function(err) { console.error(err); });

  • Make a folder. In that folder, save the code as a plaintext file called camera.js.
  • In your command line, navigate to the place you saved camera.js
  • Run `npm install tessel` if you don't already have Tessel installed globally.
  • Run `npm install camera-vc0706` to install the camera library.
  • Now run `tessel run camera.js --upload-dir .`. The upload-dir flag lets you specify where the photos are saved.
  • Take pictures!

    Step 2: Optional: Auto-tweet your pictures

    Tessel Camera

    If you want to take it a step further, this code will make it automatically post the picture it just took to Twitter as @TesselTweet:

    var location = 'San Francisco' // Write where you're tweeting from!
    // Node requires var fs = require('fs'); var https = require('https'); var crypto = require('crypto'); // Set up to Tweet var bound = require('crypto').pseudoRandomBytes(16).toString('hex'); var ctype = 'multipart/form-data; boundary=' + bound; // Tweeting as @TesselTweet var oauth_consumer_key = "O7oc0pvsZn4xjgcuHuYdX4FaC"; var oauth_consumer_secret = "iJYuHFz2sD46Nvk3mcwzX8uih14aEAMgVWdWoR59nx8v6Zl7ZX"; var oauth_access_token = "2529232909-luARGU89K4CKFMvfzBjCgG6ubefzDkdDWkSB85i"; var oauth_access_secret = "GXQfuzvGdjLEs3t1HEYfhQ9x9bdBcSBVXjBkbRgwYlOE0"; // Get time var curtime = parseInt(process.env.DEPLOY_TIMESTAMP || Date.now()); // Set up OAuth var oauth_data = { oauth_consumer_key: oauth_consumer_key, oauth_nonce: require('crypto').pseudoRandomBytes(32).toString('hex'), oauth_signature_method: 'HMAC-SHA1', oauth_timestamp: Math.floor(curtime / 1000), oauth_token: oauth_access_token, oauth_version: '1.0' }; var out = [].concat( ['POST', 'https://api.twitter.com/1.1/statuses/update_with_media.json'], (Object.keys(oauth_data).sort().map(function (k) { return encodeURIComponent(k) + '=' + encodeURIComponent(oauth_data[k]); }).join('&')) ).map(encodeURIComponent).join('&'); oauth_data.oauth_signature = crypto .createHmac('sha1', [oauth_consumer_secret, oauth_access_secret].join('&')) .update(out) .digest('base64'); var auth_header = 'OAuth ' + Object.keys(oauth_data).sort().map(function (key) { return key + '="' + encodeURIComponent(oauth_data[key]) + '"'; }).join(', '); function post (status, file) { var req = https.request({ port: 443, method: 'POST', hostname: 'api.twitter.com', path: '/1.1/statuses/update_with_media.json', headers: { Host: 'api.twitter.com', 'Accept': '*/*', "User-Agent": "tessel", 'Authorization': auth_header, 'Content-Type': ctype, 'Connection': 'keep-alive' } }, function (res) { console.log("statusCode: ", res.statusCode); console.log("headers: ", res.headers); res.on('data', function(d) { console.log(' '); console.log(' '); console.log(String(d)); }); }); req.write('--' + bound + '\r\n'); req.write('Content-Disposition: form-data; name="status"\r\n'); req.write('\r\n'); req.write(status + '\r\n'); req.write('--' + bound + '\r\n'); req.write('Content-Type: application/octet-stream\r\n'); req.write('Content-Disposition: form-data; name="media[]"; filename="test.jpg"\r\n'); req.write('\r\n'); req.write(file); req.write('\r\n'); req.write('--' + bound + '--\r\n'); req.end(); req.on('error', function(e) { console.error(e); }); } var tessel = require('tessel'); console.log('Connecting camera...'); var camera = require('camera-vc0706').use(tessel.port['A']); camera.on('ready', function(err) { if (err) return console.log('not ok - error on ready:', err); console.log('Camera connected. Setting resolution...'); camera.setResolution('vga', function(err) { if (err) return console.log('not ok - error setting resolution:', err); console.log('Resolution set. Setting compression...'); camera.setCompression(100, function(err) { if (err) return console.log('not ok - error setting compression:', err); console.log('Compression set.'); console.log('Camera ready. Press Config button to take a picture.'); tessel.led[1].high(); tessel.button.on('press', function () { console.log('Taking picture...'); tessel.led[3].high(); camera.setCompression(100, function(err) { camera.takePicture(function(err, image) { if (err) return console.log('Error taking Picture:', err); console.log('Picture taken. Posting...'); post('Tweeting from @technicalhumans #tesselcam! @nodebotsday ' + location, image); tessel.led[3].low(); }); }); }); }); }); }); camera.on('error', function (err) { console.log('Error: ', err); });

  • Make a folder.
  • In that folder, save the code as a plaintext file called camera.js.
  • In your command line, navigate to the place you saved camera.js
  • Run `npm install tessel` if you don't already have Tessel installed globally.
  • Run `npm install camera-vc0706` to install the camera library.
  • Connect to wifi: run `tessel wifi -n -p `
  • Now run `tessel run camera.js --upload-dir .`. The upload-dir flag lets you specify where the photos are saved.
  • Take pictures!

    Other things you could (trivially) do with this hardware setup:

  • Post the photos to a website using Tessel's wifi and tiny-router.
  • Control the Tesselcam remotely from a website (using Tessel's wifi and tiny-router)

    Step 3: Take pictures!

    Tessel Camera
    Tessel Camera
    Tessel Camera

    If you have a battery (the kind you'd use to charge a cell phone) on hand, run `tessel push camera.js`, disconnect from your computer, and plug in Tessel to your battery. It'll run automatically.

    Run around giggling maniacally* and taking pictures with the camera you made.

    *maniacal giggling optional

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