I am in need of guidance on my button box project. A little background on the box and myself. First off I am very new to this kind of project and both excited and nervous at the same time. I wired the box using a 5x5 matrix with a single rotary encoder and all buttons work fine. The problem is there…

[image] biggins: Am I able to use and adapt the code in the article to suit my purpose? Yes, this involves scanning the matrix. The columns are inputs and the rows are outputs. So to scan the matrix you have to produce a walking zero on the rows. That means that at any time one of the rows is…

Thanks for the reply. I had a look at the article and if I'm correct this is the schematic I need to follow but increase it for a 5x5 matrix? If I am missing anything please let me know. Could I also ask how to adapt the code for my purpose using the diodes? [Diode Diagram01]

Compare the circuit you drew to the one offered, go node by node. Just wire your matrix similar to the offered one, read the link.

[image] biggins: if I'm correct this is the schematic I need to follow Sadly you are not correct. If you make that schematic in post #4 every time you press a switch it will short out the supply. If powering it with USB you could damage the USB on your computer. The diodes need to be In seri…

I'm reading through the article posted by LarryD and I see my mistake. I thought the wires were connected but they are not. As I said I'm very new and learning. I see how it is wired but do I attach a wire from the column pin and then to 5V or does the pin supply the 5v? I am powering it with a USB.…

[image] LarryD: Just wire your matrix similar to the offered one, read the link. I have read the post again and changed up the wiring schematic and I hope this is correct. I appreciate everyone's patience in helping me figure this out. Unfortunately, I'm a little confused about the code I sho…

Where in the schematic does it show the cathodes are connected to anodes ? All you need to do is add one more column and one more row to get 5X5. Do you understand where Row1-4 and Column1-4 connect ?

[image] LarryD: Where in the schematic does it show the cathodes are connected to anodes ? I'm sorry I'm not sure what you mean. Is that the symbol at the top of the diagram you shared? The sharp lines and the 10k?

[image] LarryD: Do you understand where Row1-4 and Column1-4 connect ? I am assuming the rows would correspond to pins A1,A0,15,14,16 and the columns are pins 10,09,08,07,06. That is currently how I have the box wired. It is also power through usb.

Help with button matrix and diodes

Projects General Guidance

LarryD September 14, 2022, 12:56am 18

You need to wire your box as shown in the schematic.

However, you can do as the web site link did and use on the internal pullup resistors, you would not connect USB 5V to anything if this is done..

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Help with button matrix and diodes

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