EX-51 plus
Universal MCS-51 microcontroller Experiment board
Feature
Microcontroller Section
40-pin ZIF socket for insertion microcontroller. Support 40-pin DIP package MCS-51
microcontroller
8051 BUS direct connection from MCS-51 microcontroller pin
11.0592MHz clock
Port connector (Port 0, 1, 2 and 3). For Port 0 connect pull-up resistor ready to use.
Necessary pin connector for connect external memory included : EA, PSEN, ALE
and RESET
Experiment tools
+12V (unregulated) and +5V regulated
4x3 Matrix switch with pull-up resistor
2 of Push-button switch with pull-up resistor
4-ch. DIP swtich with pull-up resistor
4-ch. 0 to +5V Reference source for ADC experiement
Reley driver circuit with 12V relay and Uni-polar stepper motor driver circuit
8-bit Digital to Analog Converter circuit, R-2R ladder type with latch enable
7-segment LED display 2-digit in common cathode with buffer circuit
Piezo speaker driver circuit
8-bit LED monitor with latch enable
RS-232 Serial port interface. TxD and RxD connected to P3.1 and P3.0 of MCS-51
microcontroller. Addition DTR and CTS pin for more application
LCD module connector for connect LCD module with contrast adjustment.
Support 16x1 to 16x4 type
Breadboard 2.5x3.5 Inches. 390 point contact for making circuit addition
+12V 500mA external supply from DC adaptor
Size : 9x5.5 Inches
Packing List
Experiment board
Documentation
16x2 LCD module with cable
RS-232 serial port cable
Wire jumper box set
EX-51 plus MCS-51 Microcontroller Experiment board
1
Power supply
RS-232 serial port Interface
Blue-dot receptor
for 1-wire
LCD module connector
LED monitor
Piezo
speaker
driver
8051 BUS
7-segment
LED display
ZIF socket for
insertion MCU
R-2R DAC
4x3 Matrix
switch
Breadboard
Microcontroller Port
Push-button switch
4-Ch. DIP switch
0-5V Reference source for ADC
High current driver
(Relay and Stepper motor)
EX-51 plus Schematic Description
Microcontroller section
The heart of this section is P89V51RD2BN microcontroller. It is programmed
via serial port. On experiment board connect P3.0 (RxD) and P3.1 (TxD) to RS-232
circuit for interface PC’s serial port for download code. All port is connected to
Port connector for making the project or experiment.
At Port 0 connected pull-up resistor then experimenters can use this port to
interface external circuit ready.
At EA pin connected pull-up resistor for config microcntroller to use internal
flash memory. If experimenter need to use external program memory, connect
this pin to ground.
LED monitor
74HC573 Latched IC drive 8-bit LED following the data that apply to input.
Normally MCS-51 port cannot drive source current enough. Latch or buffer IC need
to support this disadvantage.
This circuit will operate when LE pin connected to logic “1” and OE pin
connect to logic “0”
2
EX-51 plus MCS-51 Microcontroller Experiment board
LED Monitor active high 8 bit
+5V
RN101
220k *8
C101
0.1/50
20
D7
D6
D5
9
12
8
13
7
14
6
D4
D2
D1
D0
16
4
17
3
18
2
19
7
6
4
3
13
14
IC201
74HC541 15
16
17
2
18
5
S304-S315
Keypad 4x3
S303
VR404
10k
1
2
3
ROW1
4
5
6
ROW2
7
8
9
ROW3
*
0
#
ROW4
Matrix switch
4x3
Push switch 2 bit
RY601
12V
R602
1k5
NC
C
NO
9
LED601
RELAY_ON
10
7
14
3
IC601
13
4
5 ULN2003 12
11
6
1
16
2
15
8
7
6
5
D4
D3
4
D2
3
D1
D0
2
IC801
74HC573
LE
D7
Q7
D6
Q6
R807
RS
RW
E
D0
D1
D2
D3
D4
D5
D6
D7
12
D2
D1
D0
R803
11 10 1
GND
R802
R811
10k
R801
R810
10k
D1 20k
R817
10k
+5V
D0 20k
+5V
40
C005
10k
PORT3
16
1
2
6
7
8
3
4
5
11
13
12
8
9
RxD/P3.0
DTR
10
6
CTS
GND
15
Serial port RS-232 interface
18
C007
33pF
19
MCS-51 Microcontroller Experiment board
Suitable for all 40-pin MCS-51 microcontroller,
Atmel's AT89 and Philips's P89C51Rx2
For AT89C1051/2051/4051 and any
microcontroller which less than 40 pin dip type
can expeiment by breadboard on EX-51+ board.
20
PORT0
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0
8
7
6
5
4
3
2
1
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0
32 33 34 35 36 37 38 39
+5V
P0.0/AD0
P0.1/AD1
P0.2/AD2
P0.3/AD3
P0.4/AD4
P0.5/AD5
P3.6/AD6
P1.0
P3.7/AD7
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P2.0/A8
P2.1/A9
P2.2/A10
P2.3/A11
P2.4/A12
P2.5/A13
Breadboard or proto-board for building
circuit experiments
size : 2.5 x 3.5 inches
contact : 390 points
EX-51 plus
C006
33pF
PORT1
2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0
P2.6/A14
LED001
POWER
TxD/P3.1
C905
28 27 26 25 24 23 22 21
P2.7/A15
P3.1/TxD
P3.0/RxD
C004
0.1/50V
C904
14
7
PORT2
P3.2/INT0
P3.4/T0
P3.3/INT1
P3.5/T1
P3.7/RD
C002
0.1/50V
2
4
IC901
3 MAX232 5
R003
10k*8
P3.6/WR
+5V
R001
220
1
RESET
3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0
Power supply
IC001
7805
C901
K901
SERIAL PORT
SK001
ZIF 40P
17 16 15 14 13 12 11 10
DATA
GND
P1001
i-Button
+5V
XTAL001
11.0592MHz
9
Vcc EA
R1001
2.2k
SK1001
Blue-dot receptor
(RJ-11 type)
C003
10/50V
Microcontroller section
R002
10k
31
K001
DC12V
C001
220/16V
R809
20k
Digital to analog converter
R-2R ladder type
D001-D004
1N4001x4
RS
E
D1
D3
D5
D7
R812
10k
D2 20k
V1
C902
R813
10k
R804
D3 20k
Q501
BC547
IN
GND
+5V
+V
C901-C905
10/50V
R814
10k
R805
D4 20k
VR401
10k
V2
K701
C903
13
V3
UIC-LCD
RW
D0
D2
D4
D6
K801
ANALOG
OUTPUT
Aout
GND
R815
10k
R806
D5 20k
14
Q5
15
Q4
16
Q3
17
Q2
18
Q1
19
Q0
D5
D4
D3
R816
10k
D6 20k
C801
0.1/50
VR402
10k
LCD connector
R808
D7 20k
20
SP501
Piezo
Varaible voltage source 0-5V 4ch.
for ADC experiment
VR701
10k
K602
OUTPUT
DRIVER
+5V
VR403
10k
+5V
+V
K601
RELAY
OUTPUT
Driver 5 Ch. (12V 500mA max.)
9
Dip switch 4 bit with
resistor pull-up
R209
1k
V4
COL3
+V
P1
P2
P3
P4
8
D6
D5
S301
DIP SW. 4P
1-Wire/iButton +5V
COL2
D7
D0
D0
Q201
BC557
Piezo speaker driver
COL1
RN801
220k *8
common
Q202
BC557
R501
1k
+5V
D1
RY
P1
P2
P3
P4
D1
D1
+5V
D0
R601
4k7
D2
D2
LED 7 segment 2 digit-mutiplexed connection
R304
10k x4
RN601
4k7 *4
R301
10k*4
D3
R210
1k
+5V
+5V
+5V
+5V
DSP201
D3
common
DIGIT2
DIGIT1
R303
10k
S302
R201-R208
220x8
1 10 19
SEGMENT
R109-R110 10k x2
R302
10k
DSP202
dp
g
f
e
d
c
b
a
11
14
11
1
OE
LE
DSP201-DSP202 : LED 7 SEGMENTS COMMON CATHODE
20
9
8
a
b
c
d
e
f
g
dp
R101-R108
510 x8
15
IC101
74HC573
5
D3
+5V
RN201
220k *8
LED101-LED108
RED x8
Tool & accessories :
1. PX-1000 microcontroller programmer or
ISP Programmer and embeded board model :
UX-51, iX-51 and KX-89
2. RS-232 serial cable
3. DC adapter 12V
4. Hook-up wire #22AWG.
5. LCD module 16x2
6. Stepper motor uni-polar type
EX-51 plus MCS-51 microcontroller Experiment board schematic diagram
EX-51 plus MCS-51 Microcontroller Experiment board
3
7-segment LED display
Include 74HC541 buffer, 2-digit common cathode 7-segment LED display,
transistor BC557 and resistors. 74HC541 receive data from input to drive LED display
each segment. LED display is connected in multiplxed and contolled by BC557
transistor.
Apply logic “0” to common pin that need to display and apply logic “1” to
segment that need to display.
Switch input
Switch is the type of input device for microcontroller experiment. Two normallyopen pushbuttons and four DIP switches are made available via connectors. The
buttons and the switches are wired in an active-low configuration, with an pull-up
resistor.
4x3 Matrix Switch or Keypad
This circuit consist of 12 push-button switch connect in matrix configuration. It
is defined 4 rows and 3 columns. The pull-up resistors are connected at column
lines. The switch position are defined in telephone keypad format, number 0 to 9,
* and #.
0 to +5V Reference Voltage Source
For support analog experiment, NX-877 plus experiment board provides 4
channels of 0 to 5V analog voltage source to supply analog voltage for ADC
circuit purpose only.
Piezo speaker Driver
Sounding device on this experiment board is Piezo speaker. It may connect
with 1 to 470mF electrolytic capacitor for amplify sound level. The piezospeaker
has resonance frequency at 2 to 3 kHz. If the resonance frequecncy apply to the
piezo speaker, it lounds maximum. The amplifier device is BC547 transistor.
High current load driver
The ULN2003 open-collector driver allows the experimenter to control highcurrent devices like relays, solenoids, lamps and motors to the EX-51 plus experiment
board. The experiment board define ULN2003’s functional thus :
4 channels for uni-polar stepper motor driving (P1 to P4)
1channel for relay driving (RY)
The current capability of ULN2003 is 500mA per channel maximum. However
its depend on supply current capability.
Note that the output-high voltage must be supplied to the V+ terminal. +V on
this board is approximate +12V
4
EX-51 plus MCS-51 Microcontroller Experiment board
Digital to Analog Converter circuit
For support digital signal application, this experiment board provides 8-bit
DAC circuit, R-2R ladde. It can convert digital data to analog voltage 0 to 5V.
Output volage is very low current, not suitable to drive output load directly.
The Op-Amp IC or any amplifier circuit need to amplify the output current to drive
load. Experimenter can construct the amplifier circuit on breadboard that provide
in this experiment board.
74HC573 latch IC is used for control the digital data input more stabilize.
LE pin must connect to logic “1” for enable this circuit.
LCD module connector
At this connector can connect with 16-characters 2-lines LCD module that
bundle in experiment board set. It prepare variable resisitor for LCD’s contrast
adjustment.
1-Wire/iButton interface RJ-11 Connector
The RJ-11 connector is configured for Maxim/Dallas 1-Wire or iButton I/O.
This experiment board bundle DS1402 iButton socket cable. Experimenter can
plug to this jack for interface iButton device (DS1990A and Ds9093F included this
package).
Preparing the Solderless Breadboard
Most experiments will involve components placed in the solderless
breadboard. The breadboard on this experiment board size is 2.5x3.5 Inches and
provides 390 point-contacts.
EX-51 plus MCS-51 Microcontroller Experiment board
5
Using EX-51 plus experiment board with
P89V51RD2 microcontroller
(1) Connect EX-51 plus experiment board to RS-232 serial port.
(2) Open Flash magic (V2.0 or higher) software. Experiemnter can download
latest version from www.esacademy.com
(3) Define parameter and open HEX file.
(4) Click START button on Flash Magic software. The warning window will
appear. It inform user to reset the microcontroller to entry ISP mode.
Experimeter apply supply voltage in this time (if not apply before) or press
RESET switch on experiment board (if apply supply voltage before). The warning
window will close. Microcontroller will entry ti ISP mode automatic and do
programming process until finish. Press RESET switch again. Microcontroller will done.
6
EX-51 plus MCS-51 Microcontroller Experiment board
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