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2.5 7 Segment Display

Welcome to this fascinating project! In this project, we will explore the enchanting world of displaying numbers from 0 to 9 on a seven-segment display.

Imagine triggering this project and witnessing a small, compact display glowing brightly with each number from 0 to 9. It’s like having a miniature screen that showcases the digits in a captivating way. By controlling the signal pins, you can effortlessly change the displayed number and create various engaging effects.

Through simple circuit connections and programming, you will learn how to interact with the seven-segment display and bring your desired numbers to life. Whether it’s a counter, a clock, or any other intriguing application, the seven-segment display will be your reliable companion, adding a touch of brilliance to your projects.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name

ITEMS IN THIS KIT

LINK

ESP32 Starter Kit

320+

ESP32 Starter Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION

PURCHASE LINK

ESP32 Board

BUY

ESP32 Camera Extension

BUY

Breadboard

BUY

Jumper Wires

BUY

Resistor

BUY

7-segment Display

BUY

74HC595

BUY

Available Pins

Here is a list of available pins on the ESP32 board for this project.

Available Pins

IO13, IO12, IO14, IO27, IO26, IO25, IO33, IO32, IO15, IO2, IO0, IO4, IO5, IO18, IO19, IO21, IO22, IO23

Schematic

../../_images/circuit_2.5_74hc595_7_segment.png

Here the wiring principle is basically the same as 2.4 Microchip - 74HC595, the only difference is that Q0-Q7 are connected to the a ~ g pins of the 7 Segment Display.

Wiring

74HC595

LED Segment Display

Q0

a

Q1

b

Q2

c

Q3

d

Q4

e

Q5

f

Q6

g

Q7

dp

Wiring

../../_images/2.5_segment_bb.png

Code

Note

  • Open the 2.5_7segment.ino file under the path of esp32-starter-kit-main\c\codes\2.5_7segment.

  • After selecting the board (ESP32 Dev Module) and the appropriate port, click the Upload button.

  • Always displaying “Unknown COMxx”?

After the code is uploaded successfully, you will be able to see the LED Segment Display display 0~9 in sequence.

How it works?

In this project, we are using the shiftOut() function to write the binary number to the shift register.

Suppose that the 7-segment Display display the number “2”. This bit pattern corresponds to the segments f, c and dp being turned off (low), while the segments a, b, d, e and g are turned on (high). This is “01011011” in binary and “0x5b” in hexadecimal notation.

Therefore, you would need to call shiftOut(DS,SHcp,MSBFIRST,0x5b) to display the number “2” on the 7-segment display.

../../_images/7_segment2.png

The following table shows the hexadecimal patterns that need to be written to the shift register to display the numbers 0 to 9 on a 7-segment display.

Glyph Code

Numbers

Binary Code

Hex Code

0

00111111

0x3f

1

00000110

0x06

2

01011011

0x5b

3

01001111

0x4f

4

01100110

0x66

5

01101101

0x6d

6

01111101

0x7d

7

00000111

0x07

8

01111111

0x7f

9

01101111

0x6f

Write these codes into shiftOut() to make the LED Segment Display display the corresponding numbers.