A special project with the AVR AT90S8515

Started by Andrew Ritchie December 18, 2002
Hello all,

I'm interested in a project that combines the power of two great
three-letter acronyms, GPS and MP3. Essentially, I'm wanting to build
a portable GPS-linked MP3 player, that plays certain audio files off a
Compact Flash disk at certain geographic locations. Sounds weird, I
know, but it does have a purpose.

Now I'll be the first to admit that I'm not an expert in this field --
far from it, but hopefully I can hack together something that works
fairly well. Two projects that I've seen that incorporate the
AT90S8515 microprocessor that are relevant can be found here:

http://www.circuitcellar.com/dl2001/avr-3rd.htm - a portable GPS
receiver

http://elm-chan.org/works/mpc/report_e.html - a pocklet-sized MP3
player

I guess the ultimate question is whether it would be possible to
combine the two above projects (no need for LCDs, GSM coverage) using
the one microcontroller? I guess I'm worried that there won't be
enough I/O pins on the micro - to interface with the Flash card, the
GPS receiver, a few buttons, a RS-232 serial connection for link-up to
a PC and an audio out (via MP3 decoder and D/A converter).

Anyone got any ideas or suggestions?

Cheers,

Andrew Ritchie
andyritchie@andy...



Hello...

I'm new to this area...I'm working on simple project to control appliances through the phone line and i'm trying to send DTMFsignal through the phone line.I designed the interface circuit with the phone line and I have the Ring detection circuit also but my problem is that i want to generate the DTMF signal using teh software not the hard ware and also I'm trying to generate 750 hz frequency inserted in the phone line as answer from the sytem to the user on the other side by using the PWM on the AVR.

pls if any one could help with code to generate PWM or DTMF to send me a mssage..

Thanks

Khalifa

Cheongju Univ- South Korea
---------------------------------


Hi you can get more information in the site of the ATMEL, in application notes you have this.
so long _________________________________________

Gil Peterson Senger Kochmann

LACTEC - Instituto de Tecnologia para o Desenvolvimento
Fone: (41) 361-6165
www.lactec.org.br -----Mensagem original-----
De: Khalifa Eltayeb [mailto:khalifa2020@khal...]
Enviada em: sexta-feira, 20 de dezembro de 2002 05:44
Para: avrclub@avrc...
Assunto: Re: [AVR club] A special project with the AVR AT90S8515
Hello...

I'm new to this area...I'm working on simple project to control appliances through the phone line and i'm trying to send DTMFsignal through the phone line.I designed the interface circuit with the phone line and I have the Ring detection circuit also but my problem is that i want to generate the DTMF signal using teh software not the hard ware and also I'm trying to generate 750 hz frequency inserted in the phone line as answer from the sytem to the user on the other side by using the PWM on the AVR.

pls if any one could help with code to generate PWM or DTMF to send me a mssage..

Thanks

Khalifa

Cheongju Univ- South Korea
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