Seeed Grove User manual

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Grove - 4-Digit Display
Version：1.0
Release date：9/20/2015
Wiki: http://www.seeedstudio.com/wiki/Grove_-_4-Digit_Display
Bazaar: http://www.seeedstudio.com/depot/Grove-4Digit-Display-p-1198.html

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Document Revision History
Revision
Date
Author
Description
1.0
Sep 21, 2015
Victor.He
Create file

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Contents
Document Revision History···································································································2
1. Introduction ···················································································································2
2. Features··························································································································3
3. Application ideas············································································································4
4. Specifications ·················································································································5
5. Interface functions·········································································································6
6. Usage······························································································································7
6.1 With TI LaunchPad ············································································································ 7
6.2 With Arduino····················································································································· 8
6.3 With Raspberry Pi ··········································································································· 11
7. Resources ·····················································································································15
8. Related Projects ···········································································································16
9. Support·························································································································18

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Disclaimer
For physical injuries and possessions loss caused by those reasons which are not related to product quality,
such as operating without following manual guide, natural disasters or force majeure, we take no
responsibility for that.
Under the supervision of Seeed Technology Inc., this manual has been compiled and published which
covered the latest product description and specification. The content of this manual is subject to change
without notice.
Copyright
The design of this product (including software) and its accessories is under tutelage of laws. Any action to
violate relevant right of our product will be penalized through law. Please consciously observe relevant local
laws in the use of this product.

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1. Introduction
Grove - 4-Digit Display module is a 12-pin module. In this module, we utilise a TM1637 to scale down the
number of controlling pins to 2. That is to say, it controls both the content and the luminance via only 2
digital pins of Arduino or Seeeduino. For projects that require alpha-numeric display, this can be a nice
choice.

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2. Features
4 digit red alpha-numeric display
Grove compatible interface (3.3V/5V)
8 adjustable luminance levels

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3. Application ideas
Time display
Stopwatch
Sensors’ input display

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4. Specifications
Item
Min
Typical
Max
Unit
Voltage
3.3
5.0
5.5
VDC
Current
0.2
27
80
mA
Dimensions
42x24x14
mm
Net Weight
7±1
g

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5. Interface functions
Grove interface - Can be connected to digital port on Grove - Base Shield.
4 - Digit display - Common anode digital tube.
Pin definition: CLK DIO VCC GND

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6. Usage
6.1 With TI LaunchPad
Displaying the Numbers (4-Digital-Display)
This example demonstrates how to display some digital numbers using a Grove-4-Digital Display.
/*
* TM1637.cpp
* A library for the 4 digit display
*/
#include "TM1637.h"
#define CLK 39 //pins definitions for TM1637 and can be changed to other
ports
#define DIO 38
TM1637 tm1637(CLK,DIO);
void setup()
{
tm1637.init();
tm1637.set(BRIGHT_TYPICAL);//BRIGHT_TYPICAL = 2,BRIGHT_DARKEST =
0,BRIGHTEST = 7;
}
void loop()
{
int8_t NumTab[] =
{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};//0~9,A,b,C,d,E,F

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int8_t ListDisp[4];
unsigned char i =0;
unsigned char count =0;
delay(150);
while(1)
{
i =count;
count ++;
if(count == sizeof(NumTab)) count =0;
for(unsigned char BitSelect =0;BitSelect <4;BitSelect ++)
{
ListDisp[BitSelect]=NumTab[i];
i ++;
if(i == sizeof(NumTab)) i =0;
}
tm1637.display(0,ListDisp[0]);
tm1637.display(1,ListDisp[1]);
tm1637.display(2,ListDisp[2]);
tm1637.display(3,ListDisp[3]);
delay(300);
}
}
6.2 With Arduino
The module uses an LED drive chip - TM1637 to control the contents and change the luminance. Here we
drive it to display time.
1. Connect the Grove socket marked "IN" on the LED Strip Driver and digital port 2 of the Grove - Base
Shield with a Grove cable. You can change to the digital port as you like. But don't forget to change the
port number in the definition of the demo code at the same time.
2. Plug onto Arduino/Seeeduino or plug Grove - Mega Shield onto Arduino Mega.
Seeeduino and Grove - 4-digit display:

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Arduino Mega and Grove - 4-digit display:
、
3. Connect Arduino/Seeeduino to PC via a USB cable.
4. Download the 4-Digit Display library and TimerOne library. Unzip and put them in the libraries file of
Arduino IDE by the path: ..\arduino-1.0\libraries.
5. Restart the Arduino IDE, open one demo code you like, for example ClockDisplay directly by the
path:File -> Example ->DigitalTube->ClockDisplay.

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6. Upload the demo code and the clock will be ticking in a few seconds. Please click here if you do not
know how to upload.
You can see this:

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6.3 With Raspberry Pi
1. You should have got a raspberry pi and a grovepi or grovepi+.
2. You should have completed configuring the development environment, otherwise follow here.
3. Connection. Plug the sensor to grovepi socket D5 by using a grove cable.
4. Navigate to the demos' directory:
cd yourpath/GrovePi/Software/Python/
To see the code
nano grove_4_digit_display.py # "Ctrl+x" to exit #
import time
import grovepi
# Connect the Grove 4 Digit Display to digital port D5
# CLK,DIO,VCC,GND
display =5
grovepi.pinMode(display,"OUTPUT")
# If you have an analog sensor connect it to A0 so you can monitor it
below
sensor =0
grovepi.pinMode(sensor,"INPUT")

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time.sleep(.5)
# 4 Digit Display methods
# grovepi.fourDigit_init(pin)
# grovepi.fourDigit_number(pin,value,leading_zero)
# grovepi.fourDigit_brightness(pin,brightness)
# grovepi.fourDigit_digit(pin,segment,value)
# grovepi.fourDigit_segment(pin,segment,leds)
# grovepi.fourDigit_score(pin,left,right)
# grovepi.fourDigit_monitor(pin,analog,duration)
# grovepi.fourDigit_on(pin)
# grovepi.fourDigit_off(pin)
while True:
try:
print "Test 1) Initialise"
grovepi.fourDigit_init(display)
time.sleep(.5)
print "Test 2) Set brightness"
for i in range(0,8):
grovepi.fourDigit_brightness(display,i)
time.sleep(.2)
time.sleep(.3)
# set to lowest brightness level
grovepi.fourDigit_brightness(display,0)
time.sleep(.5)
print "Test 3) Set number without leading zeros"
leading_zero =0
grovepi.fourDigit_number(display,1,leading_zero)
time.sleep(.5)
grovepi.fourDigit_number(display,12,leading_zero)
time.sleep(.5)
grovepi.fourDigit_number(display,123,leading_zero)
time.sleep(.5)
grovepi.fourDigit_number(display,1234,leading_zero)
time.sleep(.5)
print "Test 4) Set number with leading zeros"
leading_zero =1
grovepi.fourDigit_number(display,5,leading_zero)
time.sleep(.5)

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grovepi.fourDigit_number(display,56,leading_zero)
time.sleep(.5)
grovepi.fourDigit_number(display,567,leading_zero)
time.sleep(.5)
grovepi.fourDigit_number(display,5678,leading_zero)
time.sleep(.5)
print "Test 5) Set individual digit"
grovepi.fourDigit_digit(display,0,2)
grovepi.fourDigit_digit(display,1,6)
grovepi.fourDigit_digit(display,2,9)
grovepi.fourDigit_digit(display,3,15)# 15 =F
time.sleep(.5)
print "Test 6) Set individual segment"
grovepi.fourDigit_segment(display,0,118)# 118 =H
grovepi.fourDigit_segment(display,1,121)# 121 =E
grovepi.fourDigit_segment(display,2,118)# 118 =H
grovepi.fourDigit_segment(display,3,121)# 121 =E
time.sleep(.5)
grovepi.fourDigit_segment(display,0,57)# 57 =C
grovepi.fourDigit_segment(display,1,63)# 63 =O
grovepi.fourDigit_segment(display,2,63)# 63 =O
grovepi.fourDigit_segment(display,3,56)# 56 =L
time.sleep(.5)
print "Test 7) Set score"
grovepi.fourDigit_score(display,0,0)
time.sleep(.2)
grovepi.fourDigit_score(display,1,0)
time.sleep(.2)
grovepi.fourDigit_score(display,1,1)
time.sleep(.2)
grovepi.fourDigit_score(display,1,2)
time.sleep(.2)
grovepi.fourDigit_score(display,1,3)
time.sleep(.2)
grovepi.fourDigit_score(display,1,4)
time.sleep(.2)
grovepi.fourDigit_score(display,1,5)
time.sleep(.5)
print "Test 8) Set time"

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grovepi.fourDigit_score(display,12,59)
time.sleep(.5)
print "Test 9) Monitor analog pin"
seconds =10
grovepi.fourDigit_monitor(display,sensor,seconds)
time.sleep(.5)
print "Test 10) Switch all on"
grovepi.fourDigit_on(display)
time.sleep(.5)
print "Test 11) Switch all off"
grovepi.fourDigit_off(display)
time.sleep(.5)
except KeyboardInterrupt:
grovepi.fourDigit_off(display)
break
except IOError:
print "Error"
5. Run the demo.
sudo python grove_4_digit_display.py
5. This demo may not work if your grovepi dosen't have the newest firmware, update the firmware.
cd yourpath/GrovePi/Firmware
sudo ./firmware_update.sh

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7. Resources
Grove - 4-Digit Display V1.0 eagle files
Schematic in PDF
4-Digit Display library
TimerOne library
Four-Digit Display Suli Library
TM1637 datasheet

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8. Related Projects
If you want to make some awesome projects by 4-Digit Display, here's one project for reference.
Air Quality Box
With this demo, we can see the air quality data on 4-Digit Display.
I want to make it.
More Awesome Projects by 4-Digit Display
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