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Author:
M Asim
Khan
This
single
sided
proto
board
provides
an
economical
solution
for
developing
and
testing
the
projects
around Atmel
20
pin
series
u-controllers
(89Cx051
&
AVR).
Figure
1:
Circuit
Diagram
of Proto
Board
(click
on the
diagram
for
better
view)
Figure
1
shows
the
circuit
diagram
of
proto
board.
All
port
connections
are
available
for
user
interface
around
the
proto
area
including
the
power
supply
pins.
MAX232
serial
driver
is
used
to
provide
a 3
wire
RS232
interface
for
connecting
to
the
PC
or
other
rs232
devices.
Switch
S1
provide
a
manual
reset
to
u-controller.
The
crystal
X1,
C7 &
C8
can
be
replaced
by a
three
pin
ceramic
resonator,
the
pcb
has
provision
for
both
type
of
oscillator
interface.
For
AVR
devices
the
C6
and
R2
has
to
be
interchanged,
because
AVR
series
have
active
low
reset
input
also
the
Vcc
point
of
reset
switch
S1
has
to
be
connected
to
GND
instead
of
Vcc,
there
is a
provision
on
pcb
for
the
selection
of
reset
type
for
switch
S1.
For
printing
the
pcb
files
on
HP
laser
printer
download
the
PCBs.zip
file
and
run
the
Laser.bat
file
after
extracting
from
the
zip
file.
Figure
2 &
3
shows
the
component
layout
of
the
proto
board
pcb
and
the
track
patterns
respectively.
Figure
2:
Component
layout
of the
Proto
PCB
(click
on the
diagram
for
better
view)
Figure
3: Track
patterns
of the
Proto
PCB
Part
List of
the
Project.
1
1
B1
BRIDGE
100V 1A
(DIP
TYPE)
2
2
C1,C9
100nF
CERAMIC
3
6
C2,C3,C4,C5,C6,C11
10uF 16V
4
2
C7,C8
33pF
CERAMIC
5
1
C10
470uF
25V
6
1
D1
LED
GREEN
3mm
7
1
K1
SIP CON
3 WAY
8
1
K2
DC
SOCKET
(PCB
TYPE)
9
1
R1
100R
10
1
R2
10K
11
1
R3
560R
12
1
S1
PUSH
SWITCH
13
1
U1
MAX232
14
1
U2
AT89Cx051,
AT90S1200,
AT90S2313
15
1
U3
LM7805
16
1
X1
CRYSTAL
or
CERAMIC
RESONATOR |
