.. note:: Hello, welcome to the SunFounder Raspberry Pi & Arduino & ESP32 Enthusiasts Community on Facebook! Dive deeper into Raspberry Pi, Arduino, and ESP32 with fellow enthusiasts. **Why Join?** - **Expert Support**: Solve post-sale issues and technical challenges with help from our community and team. - **Learn & Share**: Exchange tips and tutorials to enhance your skills. - **Exclusive Previews**: Get early access to new product announcements and sneak peeks. - **Special Discounts**: Enjoy exclusive discounts on our newest products. - **Festive Promotions and Giveaways**: Take part in giveaways and holiday promotions. 👉 Ready to explore and create with us? Click [|link_sf_facebook|] and join today! .. _py_7_segment: 2.5 Number 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: .. list-table:: :widths: 20 20 20 :header-rows: 1 * - Name - ITEMS IN THIS KIT - LINK * - ESP32 Starter Kit - 320+ - |link_esp32_starter_kit| You can also buy them separately from the links below. .. list-table:: :widths: 30 20 :header-rows: 1 * - COMPONENT INTRODUCTION - PURCHASE LINK * - :ref:`cpn_esp32_wroom_32e` - |link_esp32_wroom_32e_buy| * - :ref:`cpn_esp32_camera_extension` - |link_esp32_extension_board| * - :ref:`cpn_breadboard` - |link_breadboard_buy| * - :ref:`cpn_wires` - |link_wires_buy| * - :ref:`cpn_resistor` - |link_resistor_buy| * - :ref:`cpn_7_segment` - |link_7segment_buy| * - :ref:`cpn_74hc595` - |link_74hc595_buy| **Available Pins** Here is a list of available pins on the ESP32 board for this project. .. list-table:: :widths: 5 20 * - Available Pins - IO13, IO12, IO14, IO27, IO26, IO25, IO33, IO32, IO15, IO2, IO0, IO4, IO5, IO18, IO19, IO21, IO22, IO23 **Schematic** .. image:: ../../img/circuit/circuit_2.5_74hc595_7_segment.png Here the wiring principle is basically the same as :ref:`py_74hc595`, the only difference is that Q0-Q7 are connected to the a ~ g pins of the 7 Segment Display. .. list-table:: Wiring :widths: 15 25 :header-rows: 1 * - 74HC595 - LED Segment Display * - Q0 - a * - Q1 - b * - Q2 - c * - Q3 - d * - Q4 - e * - Q5 - f * - Q6 - g * - Q7 - dp **Wiring** .. image:: ../../img/wiring/2.5_segment_bb.png **Code** .. note:: * Open the ``2.5_number_display.py`` file located in the ``esp32-starter-kit-main\micropython\codes`` path, or copy and paste the code into Thonny. Then, click "Run Current Script" or press F5 to execute it. * Make sure to select the "MicroPython (ESP32).COMxx" interpreter in the bottom right corner. .. code-block:: python import machine import time # Define the segment code for a common anode 7-segment display SEGCODE = [0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f] # Initialize the pins for the 74HC595 shift register sdi = machine.Pin(25, machine.Pin.OUT) # DS rclk = machine.Pin(27, machine.Pin.OUT) # STcp srclk = machine.Pin(26, machine.Pin.OUT) # SHcp # Define the hc595_shift function to shift data into the 74HC595 shift register def hc595_shift(dat): # Set the RCLK pin to low rclk.off() # Iterate through each bit (from 7 to 0) for bit in range(7, -1, -1): # Extract the current bit from the input data value = 1 & (dat >> bit) # Set the SRCLK pin to low srclk.off() # Set the value of the SDI pin sdi.value(value) # Clock the current bit into the shift register by setting the SRCLK pin to high srclk.on() # Latch the data into the storage register by setting the RCLK pin to high rclk.on() # Continuously loop through the numbers 0 to 9 and display them on the 7-segment display while True: for num in range(10): hc595_shift(SEGCODE[num]) # Shift the segment code for the current number into the 74HC595 time.sleep_ms(500) # Wait 500 milliseconds before displaying the next number When the script is running, 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 ``hc595_shift()`` 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 **hc595_shift(0x5b)** to display the number "2" on the 7-segment display. .. image:: img/7_segment2.png * `Hexadecimal `_ * `BinaryHex Converter `_ 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. .. list-table:: Glyph Code :widths: 20 20 20 :header-rows: 1 * - 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 ``hc595_shift()`` to make the LED Segment Display display the corresponding numbers.