Free Radio Friend Finder
The frff project is not only a software project. It also provides a hardware. The board design is
done with the eagle software. Many thanks to CadSoft for letting
Non-Profit projects use their software for free.
Schematics
Programm port
This design is a more or less dest board for our project. Therefore we have the possibility
to programm the Atmel while he is on the board. The Atmel needs SCK, MISO, MOSI and reset. In
order to keep the costs for a programming interface very low we used the programming interface
as described by Guido. The cable should not be longer than 70cm. At the beginning of our project
we used our Laptop for programming the chip. Unfortunatelly we discovered a lot of problems with
failed verify. As soon as we switched to use the desctop all problems where gone.
Pin Name at Atmel |
Pin Number on Atmel32 |
Protection Resistor |
Pin Name on parallel port |
Pin Number on parallel port |
Reset |
MOSI |
MISO |
SCK |
GND |
9 |
6 |
7 |
8 |
11,31 |
-- |
470 Ohm |
220 Ohm |
470 Ohm |
-- |
Init |
D0 |
Busy |
Strobe |
GND |
16 |
2 |
11 |
1 |
18 |
Micro Controller Power and Clock Supply
Thanks to the USB mania 5 Volt are very common now.
Digital Analog Converter for Low Frequency output
The Operational Aplifier (IC2) is descriped on the National Semiconstructor
Homepage.
Datasheet
Bill of Materials
Exported from Mainboard.sch at 7/04/2006 20:46:06
EAGLE Version 4.16r1 Copyright (c) 1988-2006 CadSoft
Part Value Device Package Library Sheet
C01 100n C-EU075-032X103 C075-032X103 rcl 1
C02 100n C-EU075-032X103 C075-032X103 rcl 1
C03 100n C-EU075-032X103 C075-032X103 rcl 1
C04 100n C-EU075-032X103 C075-032X103 rcl 1
IC1 MEGA323-P MEGA323-P DIL40 atmel 1
IC2 LM741P LM741P DIL08 linear 1
Q1 14,318 XTAL Q special 1
R01 10k R-EU_0207/10 0207/10 rcl 1
R02 2k R-EU_0207/10 0207/10 rcl 1
R03 R-TRIMM3202 RTRIM3202 rcl 1
R10 160k R-EU_0207/10 0207/10 rcl 1
R11 82k R-EU_0207/10 0207/10 rcl 1
R12 39k R-EU_0207/10 0207/10 rcl 1
R13 20k R-EU_0207/10 0207/10 rcl 1
R14 10k R-EU_0207/10 0207/10 rcl 1
SV1 MA05-2 MA05-2 con-lstb 1
Atmel description
Atmel has developed microcontrollers from very small
and cheep ones up to very big ones with a lot of features. For nearly all of them are
GCC and libc support available. In order to programm the microcrontroller with linux there
are two project available, UISP and
AVR-DUDE.
More information about the used microcontroller for this project can be found in the
Atmel Product Overview Page or in the Datasheets:
Atmel Mega 16
Product Card
Summary
Documentation
Atmel Mega 32
Product Card
Summary
Documentation
Where to buy
We got all our parts from the german mail order company Reichelt,
but we are sure that there is a electronic shop or mail order company also in your country.
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