max7219 64x16 leddisplay

max7219 64x16

max7219 64x16 leddisplay

clock and temperature display
in the evening switch on lights

Project Elements

Discussion (1 comment)

Content Director, Elektor 2 years ago

There are no details here. What are we looking at exactly?

ElektorLabs 2 years ago

This project appears to be about an Arduino-based clock that displays time and temperature on a 64 by 16 dot matrix LED display. A common configuration is a cascade of four 8x8 dot matrix displays with MAX7219 driver that are readily available online. This project probably uses two cascaded cascades to create a 64x16 pixels display.

- Time is kept by a DS1307 real-time clock
- Time is set when the clock boots, so only do this once
- Temperature is measured with a one-wire DS18B20 sensor
- Display alternates between time and temperature every 20 seconds
- The clock keeps a table with periods per month to switch output 8 ('swt') on, which can be used to control a lamp as e.g. a light that only switches on at night. The table must be filled in by the user. Time is defined as 100*hour + minutes (i.e. 630 corresponds to 6:30).
- Clock can handle daylight saving time programmatically (not automatically), must be set by the user.

Here is how to wire the displays & temperature sensor to the Arduino:

#define sck    13                 //19
#define ss     10                 //16
#define mosi   11                 //17
#define swt    8                  //14 switch 
#define temp   A1                 //24