After making a 8X10 matrix a lot of people asked me about expanding the matrix to some thing bigger, and some wanted to write stuff to the matrix via a PC, so one day I looked at a pile of LEDs that I had leftover from a LED cube projected and I decided to make a bigger the bro code pdf free download with all the things people wanted. So what are you waiting for? Get those LEDs out and heat up your soldering iron because we are about to make a 24X6 LED matrix!
So you will need the basic set of tools for this project : a soldering iron, some solder wire, a cutter, a needle nosed plier,some wire, wire striper, and some desoldering tools if you need them. The tricky behind the display is multiplexing and the idea is the same as withe the 8×10 LED matrix: It is basically a way to split information in to little peaces and send it one by one. Arduino and keep your program quite simple. Now this time we have 3 shift registers 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.
Like I said the scanning is done with the 4017, by connecting one row at a time to ground and sending the right data via the shift registers to the columns. The only thing I didn’t specified in the schematics is the value of the current limiting resistors because they change from each type of LEDs, so you will need to calculate them by your self. You should first get some specs on your LEDs, you should know their forward voltage and forward current, you can get this info from the seller. The circuit operates on 5V so your Source voltage is 5V. Download the original file to see the schematics better. I have added a PCB layout of the control board, and i want to thanks Willard2.
0 who made this layout and let me use it so thanks a lot mate! Soldering 144 LEDs in a matrix formation can be a little tricky if you don’t have a general idea how. The last time I soldered a matrix I used lots of little wire jumpers which was a pain to solder, so this time I was a little more creative and came up with this way. You need to bend the positive lead of the LED down towards the other ones and make a column, and snip off the leads you didn’t use and try to make the connections as low as you can get, and you do this to all of the positive leads.
Now the negative leads are connected in a column and thats make soldering tricky because the positive rows are in the way, so you will need to make a 90 degrees bend with the negative lead and make a bridge over the positive row to the next negative lead, and so on to the next LEDs. Now I will not explain how to solder the shift registers and all the parts because every one has hes own style and methods. We are almost there, the only thing thats left is the program. So far I wrote two programs for it that do pretty much the same thing. I have added the program that gets a word or a sentence from the arduino IDE serial monitor and displays it on the matrix, my code is very basic and may be not the best in the world but it does the work, and you are free to write your own code and modify mine as you wish. I have added an excel file so you can create your own symbols and characters. I will add in the future a code for animations and a nice game of snake as soon as I have more time on my hands.
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Congratulations you made yourself a 24×6 matrix and now you can display anything you like on the fly. Now try to play with it and come up with a new program and a better interface. We have a be nice policy. I followed all instructions but keep getting garbage on my matrix, leds will light up but no real text is visible. Can this be the cause that I am not seeing readable text?
Or can it be the board I am using, Arduina Nano. Can someone kindly describe to me in words and at a high level the methodology used here because I find the Arduino code very hard to follow because there are so few comments. So what I mean by this is does he shift in the first bit of the first row of the first word and then clock through all the rows etc. Or is there some similar code that I can look at that is well commented? Will this work with an arduino uno rev3? 2 watt resistors on this project. Can I use an arduino mega 2560 r3?
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