INTRODUCTION
If you want to have a bigger number or string display, you can consider to use 4 In 1 MAX7219 Dot Matrix Display Module. In this tutorial, we will show you how to interface MAX7219 Dot Matrix with Raspberry Pi based on Luma.LED_Matrix library. Credit to Richard Hull.
VIDEO
This video shows how to display on 4 in 1 MAX7219 Dot Matrix Display module using Raspberry Pi based on Luma.LED_matrix library.
HARDWARE PREPARATION
Wiring Connections
| 4 In 1 MAX7219 Dot Matrix Display Module | Maker pHAT |
| VCC | 5V |
| GND | GND |
| DIN | MOSI |
| CS | CE0 |
| CLK | SCK |
Software Preparation
First, you need to enable SPI module in Raspberry Pi. Then instal Luma.LED_Matrix library (credit to Richard Hull). Write following command on Terminal.
sudo apt-get install build-essential
sudo apt-get install python-dev python-pip
sudo apt-get install libfreetype6-dev libjpeg-dev
git clone http://github.com/rm-hull/luma.led_matrix.git
sudo -H pip install –upgrade luma.led_matrix
Sample Code
This is the python sample code to do a basic display on MAX7219 Dot Matrix.
| import RPi.GPIO as GPIO | |
| from time import sleep, strftime | |
| from datetime import datetime | |
| from luma.core.interface.serial import spi, noop | |
| from luma.core.render import canvas | |
| from luma.core.virtual import viewport | |
| from luma.led_matrix.device import max7219 | |
| from luma.core.legacy import text, show_message | |
| from luma.core.legacy.font import proportional, CP437_FONT, LCD_FONT | |
| serial = spi(port=0, device=0, gpio=noop()) | |
| device = max7219(serial, width=32, height=8, block_orientation=-90) | |
| device.contrast(5) | |
| virtual = viewport(device, width=32, height=16) | |
| show_message(device, 'Raspberry Pi MAX7219', fill="white", font=proportional(LCD_FONT), scroll_delay=0.08) | |
| try: | |
| while True: | |
| with canvas(virtual) as draw: | |
| text(draw, (0, 1), "Idris", fill="white", font=proportional(CP437_FONT)) | |
| #text(draw, (0, 1), datetime.now().strftime('%I:%M'), fill="white", font=proportional(CP437_FONT)) | |
| except KeyboardInterrupt: | |
| GPIO.cleanup() |
Thank you
References
- Luma.LED_Matrix, credit to Richard Hull.
Thanks for reading this tutorial. If you have any technical inquiry, please post at Cytron Technical Forum.
3 thoughts on “Displaying on MAX7219 Dot Matrix Using Raspberry Pi”
How can I drive this from shell? (On a pi)
Hi, we’re using python language. You can share more details regarding your problem at Cytron Technical Forum, and we further discuss there. Thanks.
Can I know what is the software name for coding? I doing my finally year project by using raspberry pi zero n I’m using the same coding but he has be an error.