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.