A key-chain sized Simon Says game based on the ATtiny85
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The final model should be a 50mm x 50mm (or smaller) Simon Says game based on the ATtiny85 that can be used as a key chain. The plan is to have a rechargeable 500mAh LiPo battery with integrated LiPo charger and USB that can also be used to upload code through a boot loader.
The schematic and PCB are made using KiCAD.
All of the project files are available on GitHub so feel free to take a look or fork the project and make your own variant.
Managed to scale down the PCB from 50mm x 50mm to 40mm x 40mm, this is the smallest I can make it.
Also, thanks to @flashcactus's suggestion that some people might want a ISP header I added one to the board. It can be soldered if needed but the MCUs will come with a bootlaoder flashed on to them so they can be reprogrammed over USB.
The updated files are also available on GitHub.
The MCU will be flashed with a boot loader before it gets soldered onto the board, after that all software updates will be performed over USB. So you will pretty much get a devkit. ATM I am looking into boot loaders as I think it would be overkill to write my own just for this project.
Ah, okay. I just don't like putting bootloaders onto ATTinies, they have too little flash already.
Well I thought what the hell, we already have USB, why not make it easily hackable. :D But I suppose I could look into adding a programming header (or at least the footprint for one) to the board so we have that option too. BTW thanks for the feedback! :D
Stefan Mitic
Antti Lukats
Chris Chung
Ricardo Daniel de Paula
Joel Lewis
Nice one. How's it supposed to be programmed, though?