https://github.com/marcelstoer/nodemcu-max7219

A NodeMCU library to write to MAX7219 8x8 matrix and 7-segment displays using SPI
https://github.com/marcelstoer/nodemcu-max7219

led-displays led-matrix-displays nodemcu

Last synced: 19 days ago
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A NodeMCU library to write to MAX7219 8x8 matrix and 7-segment displays using SPI

• Host: GitHub
• URL: https://github.com/marcelstoer/nodemcu-max7219
• Owner: marcelstoer
• License: mit
• Created: 2016-06-25T19:10:28.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-04-22T21:18:24.000Z (over 7 years ago)
• Last Synced: 2024-10-11T11:50:44.548Z (about 1 month ago)
• Topics: led-displays, led-matrix-displays, nodemcu
• Language: Lua
• Homepage: https://frightanic.com/iot/max7219-library-nodemcu-making/
• Size: 7.81 KB
• Stars: 33
• Watchers: 7
• Forks: 9
• Open Issues: 8
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# NodeMCU MAX7219

[![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat)](https://github.com/marcelstoer/nodemcu-max7219/blob/master/LICENSE)

### A NodeMCU library to write to MAX7219 8x8 matrix displays and 7-Segment modules using SPI

[https://frightanic.com/iot/max7219-library-nodemcu-making/](https://frightanic.com/iot/max7219-library-nodemcu-making/)

**Hint:** The module (not the logic) needs to be powered by 5V otherwise it can lead to undefined behavior.

```Lua

a = { 0x20, 0x74, 0x54, 0x54, 0x3C, 0x78, 0x40, 0x00 }

b = { 0x41, 0x7F, 0x3F, 0x48, 0x48, 0x78, 0x30, 0x00 }

c = { 0x38, 0x7C, 0x44, 0x44, 0x6C, 0x28, 0x00, 0x00 }

d = { 0x30, 0x78, 0x48, 0x49, 0x3F, 0x7F, 0x40, 0x00 }

max7219 = require("max7219")

max7219.setup({ debug = true, numberOfModules = 4, slaveSelectPin = 8, intensity = 6 })

max7219.write({a, b, c, d}, { rotate = "left" })

  

-- Clear the module(s):

max7219.clear()

  

-- Turn the module(s) off without loosing the text:

max7219.shutdown(true)

-- Turn the module(s) on:

max7219.shutdown(false)

-- Set minimum brightness:

max7219.setIntensity(0)

-- Set maximum brightness:

max7219.setIntensity(15)

-- Write to a 7-Segment module (these characters are not supported: kmwxKMWX):

max7219.write7segment("HELLO")

-- The decimal point is supported as well:

max7219.write7segment("32.5°C")

-- Write to a 7-Segment module and right-align the text:

max7219.write7segment("HELLO", true)

```

All missing features are tracked as issues on GitHub.