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Small module based on the ATtiny2313, footprints for the external crystal are available, is not mandatory to use them since the micro-controller already has an internal oscillator that can run up to 8 MHz.
The push button for the Reset was replaced with the resistor R3, that component shouldn't be soldered just make a short circuit between the terminals of the R3 footprints to reset the micro-controller.
It should fit on a breadboard. I haven't had the chance to check the dimensions.