Hi everyone,

I'm an electronics beginner and I'm starting a project. I want to do a computer mice. I've done the schematic but I'm not sure that everything is all right. So if any of you guys would take some time just to check my schematic and correct me if there's any need, I would highly appreciate it !
My project is based on the open sourced project of wareya, here is his video :

I kept the same MCU but changed pretty much everything else.
I've done a small pdf with my schematic and explanations of it.
After this I will develop the PCB, then command it, and finally develop the firmware.
I’m open to all suggestions and I want to learn.

thank for your time !

Nathan

 

Why? That is a very odd project for a beginner. Why not make something that you cannot buy for a few bucks?

 

First, welcome to AAC!
And, THANK YOU for also providing what looks like an actual circuit schematic, which allows the possibility of following the operation of the circuit. THAT is rather important if any analysis or understanding is required.
And this is certainly an ambitious project for a beginner. It seems that your skills are more than I would class as a beginner.

 

Why? That is a very odd project for a beginner. Why not make something that you cannot buy for a few bucks?

for the thrill of the challenge my friend !

 

First, welcome to AAC!
And, THANK YOU for also providing what looks like an actual circuit schematic, which allows the possibility of following the operation of the circuit. THAT is rather important if any analysis or understanding is required.
And this is certainly an ambitious project for a beginner. It seems that your skills are more than I would class as a beginner.

Thank you ! I am actually studying EEE but not for so long(should've mention it). For the moment, this project consisted of making some research and following the reference schematics in datasheets. I don’t really have much experience, so I’m afraid of forgetting elements that could prove essential later on (for firmware development, for example). I hope to find answers from more experienced guys on this forum. I don’t want to print the PCB only to end up with something unusable due to poor development.

 

don’t want to print the PCB only to end up with something unusable due to poor development

I believe it is one of Murphy’s laws that you think of a new feature only after the PCB is finished.

 

The big challenge that I see first is that because computer mice are such common items, and available (sort of)inexpensively from so many sources, it is not likely that a lot of folks have much experience with the actual design of a computer mouse. Of course, the one in the photo is a wired mouse, much simpler and no receiver or transmitter to design.
That brings up a confusing point, which is the battery. I did not see, or possibly just did not recognize, any RF link module or circuit. Unless it was the BLE module, which I did not understand the abbreviation, and so did not focus on it. And given the USB cable, it appears to be a wired mouse.

And being that I never use a mouse without a nearby computer, any reason for not attaching it with a cable is unclear to me. Just one more battery to replace or recharge, and one more item to misplace. I am ALWAYS able to locate my computer mouse by following the cord.

The very big challenge that I see will be the circuit board design. Those are a very large number of connections involved and each one must be correct. The manual checking of artwork against schematic is by far the most daunting part of a PCB design process, and it is where, with luck, all errors are found and corrected.

 

The big challenge that I see first is that because computer mice are such common items, and available (sort of)inexpensively from so many sources, it is not likely that a lot of folks have much experience with the actual design of a computer mouse. Of course, the one in the photo is a wired mouse, much simpler and no receiver or transmitter to design.
That brings up a confusing point, which is the battery. I did not see, or possibly just did not recognize, any RF link module or circuit. Unless it was the BLE module, which I did not understand the abbreviation, and so did not focus on it. And given the USB cable, it appears to be a wired mouse.

And being that I never use a mouse without a nearby computer, any reason for not attaching it with a cable is unclear to me. Just one more battery to replace or recharge, and one more item to misplace. I am ALWAYS able to locate my computer mouse by following the cord.

The very big challenge that I see will be the circuit board design. Those are a very large number of connections involved and each one must be correct. The manual checking of artwork against schematic is by far the most daunting part of a PCB design process, and it is where, with luck, all errors are found and corrected.

It's a BLE module. I represented the battery on the schematic by a simple 2x1 connector. The USB C is here to charge the battery and develop the firmware (possible via USB with the RP2040 MCU).

 

What projects have you done before?