MAX7219 Arduino Clock

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Introduction: MAX7219 Arduino Clock

Arduino Pro Mini

Step 1: Components

  • Arduino Pro Mini,
  • RTC 3232,
  • DS18B20 encapsulated temperature sensor,
  • four 8x8 LED matrix (7219).
  • 4.7K resistor

Step 2: Project

The arduino sketch is adapted after a very nice project i found here.

https://123led.wordpress.com/mini-led-clock/

I wanted something easier and i just took the basic mode and i added the temperature reading.

The project was started with an DS1307 RTC module. I changed it later into an DS3232RTC module.That is why you will find some libraries I used with DS1307.

Libraries:

https://github.com/wayoda/LedControl

https://github.com/javastraat/arduino/tree/master/...

https://github.com/javastraat/arduino/tree/9bd5961...

https://github.com/JChristensen/DS3232RTC.git

Power supply can be from 5 to 12V on RAW pin.

You can use 5V on pin VIN.

Don't forget the 4.7K resistor between data pin and power supply pin of the temperature sensor.

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    4 Comments

    0
    santiagop38
    santiagop38

    Tip 4 months ago

    Hello, I have a problem with your sketch mounted on the arduino uno connections 12data in 11clk 10 load, the whole matrix is turned on without information that may be, can you help me email pascualpalacios525@gmail.com

    0
    carlsandra2005
    carlsandra2005

    Reply 2 months ago

    you would need to change LedControl(9, 7, 8, 4);
    to LedControl(12, 11, 10, 4);

    or wire your ardunio to pins 9 (data DIN) 7 (CLK) 8 (CS)

    0
    leaomatto
    leaomatto

    Question 3 months ago on Introduction

    que arduino é este ? da erro na compilação da placa . o que devo fazer ??

    0
    carlsandra2005
    carlsandra2005

    Answer 2 months ago

    Arduino Pro Mini