#avr | Logs for 2013-07-26

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[04:37:30] <Chat6826> hey
[05:43:55] <cart_man> RikusW: Hi Rikus..what do you think of this IC for GPS only? http://otto.co.za/index.php?page=product&p=750&product=simcom-standalone-compact-gps-module
[05:44:27] <cart_man> RikusW: It seems simple enough to implement?
[05:45:01] <RikusW> You have to use that with the SIM900 afaik
[05:45:10] <RikusW> ah standalone
[05:45:18] <RikusW> I'd use PA6H
[05:45:45] <RikusW> its got a builtin antenna an is really simple to use
[05:46:11] <RikusW> and its fairly easy to solder
[05:46:28] <RikusW> http://otto.co.za/index.php?page=product&p=913&product=miniature-gps-module,-smt,-66-channel-with-patch-antenna-and-switching-circuitry-for-external-antenna
[05:47:06] <RikusW> it you use the other one you'll need to buy an antenna and do an 50Ohm RF trace on the PCB
[05:47:16] <RikusW> so in the end the PA6H is cheaper
[05:47:55] <RikusW> GMS-U1LP got builtin usb but its an older model
[05:48:10] <RikusW> SIM08 is the one for SIM900..
[05:50:27] <cart_man> RikusW: Ohh I see your concern..I was thinking of using my cars antenna? Would that help or just interfere? I thought it wouldnt really matter since signals cant choose into which they want to crash into so a GPS antenna will receive radio waves anyway just filter them out.
[05:51:07] <cart_man> RikusW: No I dont really mind the missing USB since Ill just use Seriel
[05:51:09] <cart_man> comss
[05:51:39] <twnqx> frequency matters for na antenna
[05:52:06] <twnqx> you will want an antenna tuned for gps frequencies, not for analog radio broadcast
[05:54:13] <RikusW> cart_man: forget about the car antenna...
[05:55:00] <RikusW> cart_man: car FM ant != GPS ant which runs at 1.5GHz
[05:55:21] <RikusW> the brown ceramic block on top of the PA6H is the antenna
[05:55:49] <RikusW> you'll need at least a 5x5cm groundplane for best results
[05:56:03] <RikusW> I wouldn't go any smaller
[05:59:11] <RikusW> cart_man: http://imagebin.org/265644
[05:59:32] <RikusW> here is a 600DPI image of a PCB I made for it
[05:59:52] <RikusW> there is some airwires (3)
[05:59:52] <cart_man> Sheesh massive ground plane
[06:00:09] * Mr_Sheesh eyes cart_man
[06:00:10] <RikusW> exactly
[06:00:15] <RikusW> the GPS needs that
[06:00:22] <RikusW> 50x80mm
[06:00:35] <RikusW> its already flipped
[06:00:43] <cart_man> Mr_Sheesh: Hahahaha didnt even know theres someone with the name sheesh
[06:00:46] <RikusW> so toner side will face the pcb
[06:01:15] <Mr_Sheesh> It's a humor thing :p
[06:01:19] <cart_man> RikusW: Ok i def going for PA6H
[06:01:34] <cart_man> Mr_Sheesh: Made me laugh
[06:02:22] <Mr_Sheesh> You can sheesh someone ALL day and no one can complain that you're swearing... :P
[06:02:26] <cart_man> RikusW: Do you have any extra boards lying around from when you prototyped it?
[06:03:34] <RikusW> actually I do have 1
[06:03:44] <RikusW> made 6, needed 5
[06:04:15] <cart_man> RikusW: O.o .. Whats the odds? Ill buy it from you?
[06:04:44] <RikusW> could be arranged, how soon do you want it ? I'll be in Pretoria in September
[06:05:04] <hackvana> If you need extras... :-)
[06:05:49] <cart_man> Hmm well could post it maybe aswell ? But whatever suits you best
[06:06:15] <RikusW> you'll need some SMD components...
[06:06:24] <cart_man> RikusW: Well how much though? Im a poor student. September would probably work
[06:06:30] <cart_man> RikusW: SMD components?
[06:06:38] <RikusW> 0603 caps etc
[06:06:42] <RikusW> surface mount
[06:07:17] <cart_man> RikusW: Thyeaa... I think I know of someone who would possibly solder that for me though since I dont have the tools for it.
[06:09:15] <RikusW> I might as well
[06:11:24] <cart_man> RikusW: Well if I am to buy the entire thing from you how much do you think youl charge me?
[06:11:55] <cart_man> you will`
[06:12:54] <cart_man> RikusW: Because I have a feeling that prototyping this from scratch will turn out to be pretty expensive ?
[06:13:11] <cart_man> RikusW: Although I will learn allot from it .
[06:18:44] <RikusW> might be just below R300
[06:18:49] <RikusW> GPS is R200 inc vat
[06:19:17] <RikusW> PCB was R28
[06:19:50] <cart_man> RikusW: Hmm yea ok thats fine. And it interfaces via RX / TX ?
[06:22:14] <twnqx> 0603.... so large :P
[06:22:26] <RikusW> yes
[06:22:30] <RikusW> 2.8V uart
[06:22:34] <RikusW> 3V3 Vcc
[06:22:37] <RikusW> 3.3V
[06:22:56] <twnqx> pah, that's a shottky diode with 0.5V drop at that current, solved
[06:22:59] <RikusW> I connected it to 3v3 GPIO on AVR, works fine
[06:23:13] <RikusW> and put in 270 Ohm resistors
[06:39:49] <cart_man> RikusW: Yea im going to try it on the raspberry :D
[06:40:20] <cart_man> RikusW: So when would be the best to do the transaction? I could always just EFT some money ?
[06:56:28] <RikusW> afk
[15:55:43] <Vutral> yay
[15:55:44] <Vutral> success
[15:55:54] <Vutral> emulating a 8bit atmega328p on a atmega2560
[16:01:31] <inkjetunito> :p
[16:12:01] <megal0maniac_afk> But a 2560 is 8bit :/
[16:29:29] <braincracker> h
[17:13:55] <braincracker> swapped out a ddr slot and all capacitors on my motherboard and it's like new
[17:14:27] <vectory_> noice
[17:15:58] <Roklobsta|2> braincracker: do you have some old AMD system from 2003?
[17:16:07] <braincracker> it is more like 2006
[17:16:15] <braincracker> it is 3500+ AMD64
[17:17:04] <braincracker> 2GB/s with dual ch ddr 400
[17:17:56] <braincracker> and about 13000 DMIPS
[17:18:37] <Roklobsta|2> a UC3 is faster now.
[17:18:58] <braincracker> UC3 ?
[17:19:17] <Roklobsta|2> avr32
[17:19:22] <braincracker> ;/
[17:20:11] <braincracker> i'm not sure about that
[17:24:01] <braincracker> i wouldn't give this for anything less than an 1155
[17:24:11] <braincracker> that has DDR3
[19:59:48] <TechIsCool> hey everyone got a question. on a pwm register how can I set multiple values in a single call say for instance I want to set TCC0.CCA,B,C,D all to the same value
[19:59:58] <TechIsCool> I am using xmega
[20:18:46] <Casper> TechIsCool: simple: one at a time
[20:19:11] <TechIsCool> Casper: but there is no like TCC0 = 0xFF
[20:19:23] <TechIsCool> I just want to make sure I was not wasting clock cycles
[20:19:41] <Casper> if it's 4 registers, you need 4...
[20:20:39] <TechIsCool> alright thanks
[20:23:07] <Vutral> ScadaBR++