1. Post #1161

    December 2012
    187 Posts
    No idea, I didn't have an oscilloscope back then.
    (I think you are implying that you now own one)
    Whenever you bother to do it can you please tell us? For some reason I am really interested.

    Edited:

    Wow never mind I only just realized what you meant haha
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  2. Post #1162
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    (I think you are implying that you now own one)
    Whenever you bother to do it can you please tell us? For some reason I am really interested.

    Edited:

    Wow never mind I only just realized what you meant haha
    I have 4 now, but I'm not really that interested in finding out the frequency. I'd guess it's something around 500Hz - 1kHz.
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  3. Post #1163
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    Microstrips are serious business

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  4. Post #1164
    I survived Camp FP 2010
    metallics's Avatar
    September 2005
    5,001 Posts
    Microstrips are serious business

    Having to relearn High frequency circuit analysis for a fourth year module makes me very very sad.
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  5. Post #1165
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,103 Posts
    Someone's a lucky son of a bitch.

    Why does the sign say it comes from an old GDR Volkseigener Betrieb?
    Because it probably did.
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  6. Post #1166
    Gold Member
    TTSDA's Avatar
    December 2011
    137 Posts
    Just got my NRF24L01+ transceivers in the mail.
    Their build quality is far from perfect, but as long as they all work it's good (you get what you pay for ).
    I have no way of testing them at the moment, but have some pics.

    [table="width: 500"]
    [tr]
    [td][/td]
    [td][/td]
    [/tr]
    [tr]
    [td][/td]
    [td][/td]
    [/tr]
    [/table]
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  7. Post #1167
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    Just got my NRF24L01+ transceivers in the mail.
    Their build quality is far from perfect, but as long as they all work it's good (you get what you pay for ).
    I have no way of testing them at the moment, but have some pics.

    pics
    I bought the exact same one. We could try writing an AVR library if you fancy so, I already have some experience from working with the nRF905
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  8. Post #1168
    LoneWolf_Recon's Avatar
    May 2011
    1,854 Posts
    Just got my NRF24L01+ transceivers in the mail.
    Their build quality is far from perfect, but as long as they all work it's good (you get what you pay for ).
    I have no way of testing them at the moment, but have some pics.

    [table="width: 500"]
    [tr]
    [td][/td]
    [td][/td]
    [/tr]
    [tr]
    [td][/td]
    [td][/td]
    [/tr]
    [/table]

    How much were they (as a pack of four?). And datasheet please...These may be useful to me in the future...
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  9. Post #1169
    Gold Member
    TTSDA's Avatar
    December 2011
    137 Posts
    How much were they (as a pack of four?). And datasheet please...These may be useful to me in the future...
    I bought them on ebay for about 8 for a 10-pack. They came from China.
    Here's a page about them.
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  10. Post #1170
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    I just wish there was an option to use a proper antenna instead of PCB antennas
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  11. Post #1171
    Gold Member
    TTSDA's Avatar
    December 2011
    137 Posts
    I just wish there was an option to use a proper antenna instead of PCB antennas
    Oh, but there is!
    Example
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  12. Post #1172
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    Oh, but there is!
    Example
    Yeah but that's so ridiculously overpriced, it's almost cheaper to make your own board.

    I'm not even kidding.
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  13. Post #1173
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,103 Posts
    Yeah but that's so ridiculously overpriced, it's almost cheaper to make your own board.

    I'm not even kidding.
    I'm pretty sure you can hack on your on COAX ends if you want to add an antenna. It hasn't stopped me from adding an external antenna in the past.


    Edited: Oh cool. My 50A shunts arrived today. I can't wait to ins-



    Uhhhhh..... Why is one of them cut partway through.....
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  14. Post #1174
    Gold Member
    Falcqn's Avatar
    July 2010
    3,015 Posts
    Uhhhhh..... Why is one of them cut partway through.....
    Probably to alter the resistance to make it accurate? If you consider the bits that aren't cut through and the thin sliver where it is cut through as 3 resistors in series, the one in the middle (cut through bit) has a higher resistance due to its decreased cross-sectional area.

    I could be over-thinking this though
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  15. Post #1175
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,103 Posts
    Probably to alter the resistance to make it accurate? If you consider the bits that aren't cut through and the thin sliver where it is cut through as 3 resistors in series, the one in the middle (cut through bit) has a higher resistance due to its decreased cross-sectional area.

    I could be over-thinking this though
    Thought the same thing but I bought two shunts and only has it.
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  16. Post #1176
    Gold Member
    Falcqn's Avatar
    July 2010
    3,015 Posts
    Thought the same thing but I bought two shunts and only has it.
    Hrm. Usually if a part I bought (especially if it was something as simple as a shunt..) had a tiny little chip in it or something like that I'd just say "It's probably not worth worrying about", but since you're dealing with 50 A here.. Try testing them with a DMM to make sure they both have the same resistance?
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  17. Post #1177
    Cockman's Avatar
    January 2012
    79 Posts
    General question,

    do you ever use dynamic memory allocation (malloc, free) in embedded systems programming with C? If so, under what circumstances?
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  18. Post #1178
    Gold Member
    Elspin's Avatar
    December 2006
    5,492 Posts


    why
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  19. Post #1179
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    General question,

    do you ever use dynamic memory allocation (malloc, free) in embedded systems programming with C? If so, under what circumstances?
    Not on AVRs. Never ever. I've done that once, and it just is sooo much headache...
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  20. Post #1180
    LoneWolf_Recon's Avatar
    May 2011
    1,854 Posts
    Not on AVRs. Never ever. I've done that once, and it just is sooo much headache...
    Unless I am mistaken, I think WinAVR includes libraries to do that..
    http://www.nongnu.org/avr-libc/user-...p__alloca.html
    http://www.nongnu.org/avr-libc/user-..._pgmspace.html

    Or perhaps its easier to do in ASM (Either way runtime memory allocation is hard)
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  21. Post #1181
    chipset's Avatar
    November 2010
    2,267 Posts
    Its... Hangout time!
    https://plus.google.com/hangouts/_/3...ser=0&hl=en-GB

    Everyone is welcome
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  22. Post #1182
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    Unless I am mistaken, I think WinAVR includes libraries to do that..
    http://www.nongnu.org/avr-libc/user-...p__alloca.html
    http://www.nongnu.org/avr-libc/user-..._pgmspace.html

    Or perhaps its easier to do in ASM (Either way runtime memory allocation is hard)
    I don't know the technical details about it, but somebody told me that for some reason it doesn't quite work on AVRs the way it's supposed to, resulting in memory leaks and eventual shutdown of your program.
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  23. Post #1183
    LoneWolf_Recon's Avatar
    May 2011
    1,854 Posts
    Ya'll always start while I'm in Comp Sci lecture :c

    Have fun
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  24. Post #1184
    chipset's Avatar
    November 2010
    2,267 Posts
    Ya'll always start while I'm in Comp Sci lecture :c

    Have fun
    I'll be keeping the hangout on all evening while I do stuff. I see these more of a chance to share your activities with other people than anything else. Kinda like, what the name implies, a change to hang out with people while going about your business. Currently I'm machining some parts for my dads RC hydro boat, specifically the engine mounts.
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  25. Post #1185
    Gulen's Avatar
    December 2011
    2,876 Posts
    I think I might join, I got some LEDs today and I'm gonna try and do something with them.
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  26. Post #1186
    I survived Camp FP 2010
    metallics's Avatar
    September 2005
    5,001 Posts
    You can enjoy watching me do high frequency transmission line problems.
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  27. Post #1187
    LoneWolf_Recon's Avatar
    May 2011
    1,854 Posts
    Weekend Hangout perchance?
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  28. Post #1188
    chipset's Avatar
    November 2010
    2,267 Posts
    Weekend Hangout perchance?
    Probably. Friday evening, Saturday or Sunday?
    Or all of the above?
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  29. Post #1189
    Gulen's Avatar
    December 2011
    2,876 Posts
    Great to walk into your workshop, only to find you've left your iron plugged in for several days, and it no longer works...
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  30. Post #1190
    Gold Member
    ddrl46's Avatar
    October 2007
    3,685 Posts
    Great to walk into your workshop, only to find you've left your iron plugged in for several days, and it no longer works...
    Good excuse to buy a nice soldering station.
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  31. Post #1191
    www.bff-hab.de
    Dennab
    August 2012
    1,526 Posts
    Good excuse to buy a nice soldering station.
    Just to destroy it aswell?
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  32. Post #1192
    Gold Member
    ddrl46's Avatar
    October 2007
    3,685 Posts
    Just to destroy it aswell?
    Make sure it has an illuminated power switch.
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  33. Post #1193
    Gold Member
    Xera's Avatar
    November 2006
    3,097 Posts
    Make sure it has an illuminated power switch.
    Or a nice big glowing screen.
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  34. Post #1194
    alexaz's Avatar
    October 2010
    298 Posts
    Or just really expensive, so there's no way you will forget about it.
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  35. Post #1195
    Gold Member
    Chryseus's Avatar
    February 2009
    2,465 Posts
    The hangout: where Chryseus sets himself on fire for amusement.

    Tune in next time for more crazy fun!
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  36. Post #1196
    RISC MASTER RACE.
    MIPS's Avatar
    August 2010
    7,103 Posts
    Spent my ban layover finishing my new power metering rig.



    I'm now just missing a small 1" coupling between the ammeter box and the breaker panel. Cutting those two damn holes wore out the brushes on my second hand dremel.
    Speaking of which, I upgraded the mounting blocks for the shunt resistors.



    I really don't trust plastic on something that already has the potential to overheat. I grabbed a stick of bakelite and cut it up and made replacement block because bakelite is not only an insulator but heat and fire resistant.
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  37. Post #1197
    Gold Member
    ddrl46's Avatar
    October 2007
    3,685 Posts
    16 * 13 array of core memory!

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  38. Post #1198
    I pleasure myself while wearing Combine armour~~
    digigamer17's Avatar
    May 2010
    8,006 Posts
    16 * 13 array of core memory!

    Curious of what you're doing here. I'd like to see myself use electronics to make my own BASIC computer.
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  39. Post #1199
    Gold Member
    ddrl46's Avatar
    October 2007
    3,685 Posts
    Curious of what you're doing here. I'd like to see myself use electronics to make my own BASIC computer.
    That isn't my own creation, it's out of an old computer type device created by a company that started with a B (forgot the full name) that did statistics work.
    I do want to reverse engineer the thing and possibly use it though.
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  40. Post #1200
    I pleasure myself while wearing Combine armour~~
    digigamer17's Avatar
    May 2010
    8,006 Posts
    That isn't my own creation, it's out of an old computer type device created by a company that started with a B (forgot the full name) that did statistics work.
    I do want to reverse engineer the thing and possibly use it though.
    Ahhh.

    But yeah I wonder if I can build a BASIC computer after I go through the basics stuff in soldering and wiring. Probably make good use out of the Rhapsody TV I have.
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