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10:18:57  <mafintosh>mappum: hey, wa7son had a few questions about some of the hackrf stuff we did if you remember any of it :)
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10:21:29  <mappum>mafintosh: I'm about to go to sleep, but sure I could try to help you out real quick
10:22:42  <wa7son>mappum: hi. I'm trying to use the hackrf module and Mathias told me that you used it to send bits over radio at CCC
10:23:00  <wa7son>mappum: do you remember how you generated the signal that you transmitted?
10:23:39  <wa7son>mappum: maybe if you just have the code you used on github I can take a look
10:24:57  <mappum>Wa7son: We made a hilariously terrible modem, I'll try to find the code.
10:25:31  <wa7son>mappum: awesome :) thanks
10:31:56  <mappum>wa7son mafintosh : here's the code we used at CCCamp https://github.com/mappum/ghetto-modulation
10:32:11  <wa7son>mappum: ha, nice name :)
10:32:31  <mappum>i think it was mafintosh's idea :P
10:32:36  <mafintosh>ah yes
10:32:43  <mafintosh>thanks mappum!
10:33:09  <mappum>i also made a slightly better interface than the hackrf module: https://github.com/mappum/hackrf-stream, but there's still a lot of work over that just to transmit bits
10:33:15  <wa7son>mappum: have you worked with SDR after CCC?
10:34:28  <mappum>a few times, but not much. i tried to build a better modulator, but i'm not sure i had the math correct and node wasn't quite fast enough
10:34:42  <mappum>the guy who designed the hackrf has some pretty good tutorials though: https://greatscottgadgets.com/sdr/7/
10:35:21  <wa7son>mappum: thanks :)
10:37:48  <mappum>good luck, let me know if you guys make any progress. it would be super cool to have node radio code and pipe data over the radio :)
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10:47:11  <wa7son>mappum: that's my plan at least :) I'm also trying to figure out how FFT works... math overload though :(
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10:49:10  <mappum>wa7son: yeah that stuff is hard. are you trying to make a spectrum analyzer? i remembered that i started on one back when we were working on this stuff: https://github.com/mappum/airwave
10:49:35  <mappum>it kind of looked like it was working, but i really had no way of knowing if it was correct :/
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10:49:54  <wa7son>mappum: your github is a treasure trove of SDR code :)
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15:58:48  <emilbayes>wa7son: this is the best book i've read on DSP, and it defers complex numbers until the very end: http://www.dspguide.com/
15:59:10  <wa7son>emilbayes: thnx :)
15:59:20  <emilbayes>wa7son: i read it before uni, and i remember it as being very approachable
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16:23:07  <mafintosh>mappum: do you have any of the examples we had showing sin curves?
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18:42:38  <mappum>mafintosh: i can't find that code, but it should be pretty simple to reproduce. i was just transmitting all 0xff's, and then repeatedly calling setFrequency to a range for the sin wave values
18:42:52  <mafintosh>mappum: ah okay, that makes sense
18:43:06  <mafintosh>mappum: wa7son controls an rv car with hackrf now
18:43:23  <mappum>whoa, that's awesome
18:43:33  <mappum>via js?
18:43:36  <mafintosh>yea
18:43:48  <mappum>that's really cool!
18:44:11  <noffle>oooh
18:46:07  <mappum>is the code going to be on github?
18:47:55  <mafintosh>def
18:48:52  <pfrazee>is there any physical device that wa7son cant node
18:50:14  <mappum>^
18:57:52  <noffle>wa7son: is your code up somewhere?
19:22:09  <wa7son>noffle: not yet
20:34:45  <mafintosh>too much fun driving this car in the terminal
20:53:50  <mappum>with the arrow keys?
20:59:47  <mafintosh>qweasd
21:00:09  <mafintosh>cant hold down two arrow keys it seems
21:08:08  <mappum>now point a webcam at it, and let people control it over the internet :)
21:13:43  <mafintosh>yea!
21:14:47  <noffle>via telnet :D
21:15:36  <mafintosh>first step is a module for the car
21:15:51  <mafintosh>then add some cool preprogrammed maneveurs
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