GravityZero is an Open Source STM32G473-based development board with two USB ports (Native & CH340 Serial), and access to nearly all the IO ports through the headers. alongside an onboard "NeoPixel" RGB LED.
More can be learned about it in my Write Up Here.
Most probably not no, the microcontroller isn't cheap ( at the time of writing ), the pcb is 4 layer pcb which can most likely be reduced down to two, and there plenety of cheaper options out there. This was designed for the experience & fun, which again you can learn more about in my write up.
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