├── .gitignore
├── gareth-hackrf-node-success.jpg
├── gareth.png
├── gareth.raw
├── image-transfer.js
├── package.json
├── readme.md
└── test-data.js


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Logs
 2 | logs
 3 | *.log
 4 | npm-debug.log*
 5 | 
 6 | # Runtime data
 7 | pids
 8 | *.pid
 9 | *.seed
10 | 
11 | # Directory for instrumented libs generated by jscoverage/JSCover
12 | lib-cov
13 | 
14 | # Coverage directory used by tools like istanbul
15 | coverage
16 | 
17 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
18 | .grunt
19 | 
20 | # node-waf configuration
21 | .lock-wscript
22 | 
23 | # Compiled binary addons (http://nodejs.org/api/addons.html)
24 | build/Release
25 | 
26 | # Dependency directory
27 | # https://docs.npmjs.com/misc/faq#should-i-check-my-node-modules-folder-into-git
28 | node_modules
29 | 


--------------------------------------------------------------------------------
/gareth-hackrf-node-success.jpg:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/gyaresu/hackrf-node-stuff/2602cc3ab7533d8d37fd6bc5da075c300142b8a5/gareth-hackrf-node-success.jpg


--------------------------------------------------------------------------------
/gareth.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/gyaresu/hackrf-node-stuff/2602cc3ab7533d8d37fd6bc5da075c300142b8a5/gareth.png


--------------------------------------------------------------------------------
/gareth.raw:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/gyaresu/hackrf-node-stuff/2602cc3ab7533d8d37fd6bc5da075c300142b8a5/gareth.raw


--------------------------------------------------------------------------------
/image-transfer.js:
--------------------------------------------------------------------------------
 1 | var devices = require('hackrf-stream')
 2 | var fs = require('fs')
 3 | 
 4 | var radio = devices(0).open(0)
 5 | 
 6 | radio.setFrequency(9.15e8)
 7 | 
 8 | radio.setSampleRate(3.7e6)
 9 | 
10 | var tx = radio.createWriteStream()
11 | 
12 | fs.readFile('./gareth.raw', function (err, data) {
13 |   if (err) {
14 |     throw err
15 |   }
16 |   tx.write(data)
17 | })
18 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "hackrf-node-stuff",
 3 |   "version": "1.0.0",
 4 |   "description": "Folks were playing around with [Hellschreiber](https://en.wikipedia.org/wiki/Hellschreiber) encoding in the #hackrf channel on Freenode last week using `hackrf_transfer`",
 5 |   "main": "image-transfer.js",
 6 |   "dependencies": {
 7 |     "hackrf": "^3.0.1",
 8 |     "hackrf-stream": "^1.0.1"
 9 |   },
10 |   "devDependencies": {},
11 |   "scripts": {
12 |     "test": "echo \"Error: no test specified\" && exit 1"
13 |   },
14 |   "repository": {
15 |     "type": "git",
16 |     "url": "git+https://github.com/gyaresu/hackrf-node-stuff.git"
17 |   },
18 |   "keywords": [],
19 |   "author": "",
20 |   "license": "ISC",
21 |   "bugs": {
22 |     "url": "https://github.com/gyaresu/hackrf-node-stuff/issues"
23 |   },
24 |   "homepage": "https://github.com/gyaresu/hackrf-node-stuff#readme"
25 | }
26 | 


--------------------------------------------------------------------------------
/readme.md:
--------------------------------------------------------------------------------
 1 | ## HackRF Node Stream Spectrum Painter
 2 | 
 3 | Folks were playing around with [Hellschreiber](https://en.wikipedia.org/wiki/Hellschreiber) encoding in the #hackrf channel on Freenode last week using `hackrf_transfer`
 4 | 
 5 | <blockquote class="twitter-tweet" data-partner="tweetdeck"><p lang="en" dir="ltr">HackRF&#39;s tx/rx&#39;ing images in waterfall plots using <a href="http://t.co/Lyijkr63QP">http://t.co/Lyijkr63QP</a> <a href="http://t.co/JwLsO29dqC">http://t.co/JwLsO29dqC</a> <a href="https://twitter.com/hashtag/SDR?src=hash">#SDR</a> <a href="https://twitter.com/hashtag/HackRF?src=hash">#HackRF</a> <a href="http://t.co/aAKk4eLBgV">pic.twitter.com/aAKk4eLBgV</a></p>&mdash; ☞ Gareth (@gyaresu) <a href="https://twitter.com/gyaresu/status/634796029859131396">August 21, 2015</a></blockquote>
 6 | <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
 7 | 
 8 | 
 9 | Which then made me remember a tweet from @maxogden playing around with a `hackrf` `node` module at the [CCC](https://www.ccc.de/en/) 2015 camp last week.
10 | 
11 | And using a `hackrf` via `node` is something I've wanted since before it was even a `thing`.
12 | 
13 | ### Spectrum Painter 
14 | 
15 | ##### Use [Spectrum Painter](https://github.com/polygon/spectrum_painter) to create an IQ stream:
16 | 
17 | ```bash
18 | python spectrum_painter/img2iqstream.py examples/gareth.png --samplerate 8000000 --format hackrf > gareth.raw
19 | ```
20 | 
21 | ##### Then test with `hackrf_transfer`: 
22 | ```bash
23 | hackrf_transfer -f 915000000 -s 3700000 -t gareth.raw -x 20 -a 1
24 | ```
25 | 
26 | ##### Show the transmission on a second machine with `gqrx`:
27 | [GQRX](http://gqrx.dk) is a multi-platform software reciever with waterfall plot.
28 | 
29 | You might need to tweak some of the sample rate / fft settings in both `hackrf_transfer` & `gqrx` to get the correct aspect ratio but it's not difficult.
30 | 
31 | ```
32 | FFT: 8192
33 | Rate: 50fps
34 | Filter Width: Normal
35 | Filter Shape: Normal
36 | Mode: Narrow/FM
37 | AGC: Fast
38 | ```
39 | 
40 | ### HackRF for Node
41 | 
42 | ##### So I wrote something straight from my brain using [hackrf-stream](https://github.com/mappum/hackrf-stream)...
43 | 
44 | 
45 | ```node
46 | var devices = require('hackrf-stream')
47 | var fs = require('fs')
48 | 
49 | var radio = devices(0).open(0)
50 | 
51 | radio.setFrequency(9.15e8)
52 | 
53 | radio.setSampleRate(3.7e6)
54 | 
55 | var tx = radio.createWriteStream()
56 | 
57 | fs.readFile('./gareth.raw', function (err, data) {
58 |   if (err) {
59 |     throw err
60 |   }
61 |   tx.write(data)
62 | })
63 | ```
64 | ##### ... and it worked.
65 | 
66 | ![First test](./gareth-hackrf-node-success.jpg)
67 | _I managed to capture the very first code test. While in utter shock it actually worked!_
68 | 


--------------------------------------------------------------------------------
/test-data.js:
--------------------------------------------------------------------------------
 1 | var devices = require('hackrf-stream')
 2 | var fs = require('fs')
 3 | 
 4 | var radio = devices(0).open(0)
 5 | 
 6 | radio.setFrequency(9.15e8)
 7 | 
 8 | radio.setSampleRate(3.7e6)
 9 | 
10 | var tx = radio.createWriteStream()
11 | 
12 | fs.readFile('./gareth.raw', function (err, data) {
13 |   if (err) {
14 |     throw err
15 |   }
16 |   var img = data
17 | 
18 |   while (true) {
19 |     tx.write(img)
20 |   }
21 | })
22 | 


--------------------------------------------------------------------------------