About five years ago I made a Led matrix 24x6 according to descriptions on instructales and I modified the project by adding a Bluetooth connection so that the content of the text can be entered wirelessly via a smartphone.
This device, by adding only real-time clock module we can convert it into a nice big alarm clock so that depending on which code is uploaded it can be switched between clock or moving text matrix. Idea and code for this modification I got from the last clock context also on the Instructables from autor Cermakamara, where this project got Second Prize.
Тo make the LED matrix we use 3 shift registers 74HC595 which multiply the number of outputs and save lots of arduino pins. Each shift register has 8 outputs and you only need 3 arduino pins to control almost an limited numbers of shift registers. We also use the 4017 decade counter to scan the rows, and you can scan up to 10 rows with it because you have only 10 outputs but to control it you need only 2 pins. More details on making the matrix itself can be found on my former project at: [ Ссылка ].
Instructions , schematics and codes at:
[ Ссылка ]
If you're interested, you can check out my playlist of unusual clocks at the link:
[ Ссылка ]
Visit my Youtube Channel for more Projects , DIY and How To Make videos:
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by mircemk
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