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Thread
2005-01-06 by alan_probandt
The AVR brochure for the new debugWIRE and JTAG interface module mentions that debugWIRE will be implemented on the Tiny25 and Tiny45 chips, along with the current Mega48, Mega68, and Tiny2313 and Tiny13. Does anyone have any idea of what will be on these projected Tiny25 and Tiny45 chips? There is no reference to them anywhere on the web. The big question is: Will they be cheap and powerful like the Tiny13 and Mega48?
2005-01-07 by Lasse Madsen
Hi All,
I am about to use some IRDA transceivers for a project but I don’t exactly know how it works.
What I would like to do is connect the IRDA transceiver directly to the UART of my AVR.
I want to transfer some bytes with approx 1200 baud 8 bit data 1 bit stop from one AVR to another so no PC, mobile phone etc. is involved.
But in some of the schematics I’ve found here and there I see that a lot of people use some “interface” chips between the processors UART and the actual “IR Transceiver”
Can anyone point me in some directions?
Best regards
Lasse Madsen
2005-01-07 by alan_probandt
For transmitting data from an AVR, the data needs to amplified. The current coming out a single port pin is not enough to drive an infraRed LED. To boost the signal, I've had success with a ULN2003a chip. Do a Google search for a chip's datasheet in PDF for more info. The infra red signal is switched on and off about 40000 times a second. Then this 40K pulse train is switched on and off in a code pattern. Every big company has their own code, which is why a Sony remote doesn't work with a Panasonic. They use different codes, but the infraRed is switched 40K by all. The 40K switching prevents the IR receiver from acting on any background infrared light in the room. To detect the IR LED signal, try using a Panasonic PNA4601M. This 3- pin chip will capture and amplify the infraRed signal and remove the 40K pulsing. It will put out the IR code at +5V and 0 levels. This signal can go directly into the port pin on an AVR.
2005-01-07 by Q boll
http://www.infrarotport.de/tfd_4.pdf >From: "Lasse Madsen" <lasse.madsen@elektronik.dk> >Reply-To: AVR-Chat@yahoogroups.com >To: <AVR-Chat@yahoogroups.com> >Subject: [AVR-Chat] IRDA ? >Date: Fri, 7 Jan 2005 02:03:53 +0100 > >Hi All, > >I am about to use some IRDA transceivers for a project but I don't exactly >know how it works. > >What I would like to do is connect the IRDA transceiver directly to the >UART >of my AVR. >I want to transfer some bytes with approx 1200 baud 8 bit data 1 bit stop >from one AVR to another so no PC, mobile phone etc. is involved. > >But in some of the schematics I've found here and there I see that a lot of >people use some "interface" chips between the processors UART and the >actual >"IR Transceiver" > >Can anyone point me in some directions? > > >Best regards >Lasse Madsen > > > _________________________________________________________________ MSN Webmessenger overal en altijd beschikbaar http://webmessenger.msn.com/