Easy 4digit Display and Counter D

© Copyright 2011

by e-Gizmo Mechatronix Central

All Rights Reserved

Pages 1 of 9 pages

www.e-Gizmo.com

Wire it on your microcontroller circuit, or hook it up

on your PC parallel port, and you will be able to dis-

play 4 digit numbers with little programming effort.

Also functions as a stand alone digital counter.

Easy 4-digits 7 segment LED Display

Hardware Manual Rev 1r0

FEATURES & SPECIFICATIONS

• 5V Power Supply

• 2 Available modes (Digit Display mode and

Counter mode).

• BCD Binary Coded Decimal

• Stand alone Digital Counter

© Copyright 2011


All Rights Reserved

Pages 2 of 9 pages

www.e-Gizmo.com

Easy 4-Digits 7 Segment LED Display Datasheet Version 1

MAJOR COMPONENTS PRESENTATION

Figure 1. Easy 4-digits 7 segment LED display and major components presenta!on

Bo!om View

© Copyright 2011


All Rights Reserved

Pages 3 of 9 pages

www.e-Gizmo.com


Figure 2. Easy 4-digits 7 segment LED display JP2 Pin

If the JP2 header pins has a jumper a!ached

to it, you are in ‘Counter Mode’ and to enter the ‘Dig-

its Display Mode’ just remove the jumper a!ached.

When in digit display mode the JP1 pins D3-

D0 became binary inputs and the ‘UP‘ and ‘DOWN‘

func"ons will be disabled.

Figure 3. Easy 4-digits 7 segment LED display

JP1 Pins

Pin I.D. Func"on

GND Ground

5V 5V Power Supply

D3 I/O

D2 I/O

D1/UP I/O/Increment

D0/DOWN I/O/Decrement

Shi#/Clear Shi# register/Clear counter

Table 1. JP1 Pins Pin Descrip!on and fnc!ons

Func"on D3 D2 D1 D0

Display Registers (BCD F) 1 1 1 1

Load BCD 1 0 0 0 1

Load BCD 2 0 0 1 0

Load BCD 3 0 0 1 1

Load BCD 4 0 1 0 0

Load BCD 5 0 1 0 1

Load BCD 6 0 1 1 0

Load BCD 7 0 1 1 1

Load BCD 8 1 0 0 0

Load BCD 9 1 0 0 1

Load BCD 0 0 0 0 0

Load BCD A 1 0 1 0

Load BCD B 1 0 1 1

Load BCD C 1 1 0 0

Load BCD D 1 1 0 1

Load BCD E 1 1 1 0

Table 2. Binary register in digit display mode‘1’ = High

‘0’ = Low

© Copyright 2011


All Rights Reserved

Pages 4 of 9 pages

www.e-Gizmo.com


Features (Display Mode)

Internal 4 stage shi# buffer

Internal pull-up resistors (data and control lines)

Display numbers 0-9 as well as characters A-E (F is used as instruc"on to display out the content of the 4

buffers

42 frames per second maximum opera"ng speed

Display Mode Opera"on

The device is in display mode when the jumper mode selector is open. In this mode, the device just

wait for a high to low transi"on in the Shi# pin and when it detects a transi"on, its reads D3-D0, shi# it in the

4 stage buffer if it is data (0-9 or A-E) or display the content of the buffers when it receives an F (1111).

On power up or upon switching from counter mode to display mode, the display shows 8888 (four 8’s)

but the contents of the buffers are all 0’s. This can be proven by sending F (1111) first.

Ex: Displaying 1234 to the 4-digit display:

1. Load BCD 1 to D0-D4 then toggle Shi# line.



OPERATIONS - DISPLAY MODE & COUNTER MODE

© Copyright 2011


All Rights Reserved

Pages 5 of 9 pages

www.e-Gizmo.com


5. Load F (1111) to D0-D4 then toggle Shi# line.

Features (Counter mode)

Up, down and Reset pins

Counts from 0000-9999

Internal pull-up resistors (data and control lines)

140 counts per second maximum (see "ming diagram)

Counter Mode Opera"on

The device is in counter mode when jumper mode selector is close. In this mode, D1, D0 and Shi#

pins becomes the Up, Down and Reset pins respec"vely (D3 and D2 has no func"on). To operate the coun-

ter, all it needs is a high to low transi"on on any of its pins. One way is to short any pin to ground. Note that

the counter is fast and it has no internal debounce protec"on when mechanical contact (switch) is used

which can cause mul"ple counts. To avoid this problem, simply add a capacitor (10 – 100 nF typical) to each

input pin going to ground or simply parallel to the switch or contact.


© Copyright 2011


All Rights Reserved

Pages 6 of 9 pages

www.e-Gizmo.com

CONNECTING TO MICROCONTROLLERS

Figure 4. Easy 4-digits

7 segment LED display

Connected to a mi-

crocontroller through

GPIO port

Figure 5. Easy 4-digits 7 segment LED display

Connected to gizDuino microcontroller.


© Copyright 2011


All Rights Reserved

Pages 7 of 9 pages

www.e-Gizmo.com


Fig

ure

6. T

imin

g D

iagra

m o

f Dig

it Dis

pla

y M

ode.

© Copyright 2011


All Rights Reserved

Pages 8 of 9 pages

www.e-Gizmo.com

NC1

A12

A23

A34

A45

G6

F7

E8

D9

C10

B11

A12

NC13

U1

4 D

IGIT

7-S

EG

ME

NT

DIS

PL

AYR

20

150

R21

150

R22

150

R23

150

R24

150

R25

150

R26

150

+C

2220uF

/16V

C3

104

P31/O

E8

P32/E

PM

9

P33/V

PP

10

XT

AL

1/C

E7

GND14

XT

AL

26

VCC5

P00/C

LR

11

P27/D

74

P01/C

LK

12

P26/D

63

P02/P

GM

13

P25/D

52

P20/D

015

P24/D

41

P21/D

116

P23/D

318

P22/D

217

U2

Z86E

04

Y1

7.2

Mhz

C5

27

C4

27

VC

C

VC

CV

CC

QB1

QC2

QD3

QE4

QF5

QG6

QH7

GND8

QH'9

SCLR10

SCLK11

RCLK12

OE13

SER14

QA15

VCC16

U3

74H

C595

Q4

PN

PQ

3P

NP

Q2

PN

PQ

1P

NP

VC

C

R12

5.1

K

R13

5.1

K

R14

5.1

K

R15

5.1

K

R19

1.5

KR

16

1.5

KR

17

1.5

KR

18

1.5

K

1234567

JP1

HE

AD

ER

7

R8

10 K

R11

10 K

R10

10 K

R9

10 K

R1

10 K R

210 K R

310 K R

410 K R

510 K R

610 K

1 2JP

2

JUM

PE

R

R7

10 K

VC

C

F1

FU

SE

1

D1

DIO

DE

Gnd

5 V

D0/D

ow

nD

1/U

pD

2D

3

Shift/C

lear

Functio

n S

elect

0 - D

isplay M

ode

1 - C

ounter M

ode

4 D

igit D

ispla

y / U

p-D

ow

n C

ou

nter

Fig

ure

7. S

chem

atic

Dia

gra

m o

f Easy 4

-Dig

its 7

Segm

ent L

ED

Dis

pla

y


© Copyright 2011


All Rights Reserved

Pages 9 of 9 pages

www.e-Gizmo.com

PCB BOARD PRESENTATION

Figure 8. Easy 4-Digits 7 Segment LED Display

Silk Screen Layout

Figure 9. Figure 7. Easy 4-Digits 7 Segment LED Display

PCB Copper Pa"ern


Documents

Easy 4digit Display and Counter D