Any new firmware needs to know the GPIOs After confirming that the chip had write access in ISP mode, the next step was to determine the appropriate inputs and outputs.

Circuit and PCB design for the Bluetooth audio player project. The circuit design is not complicated. The main sections are MCU with 8MHz crystal and supporting caps, ...

This is part 3 of a 4-part series on building a toaster reflow oven: Oven hardware Controller hardware Manufacturing Controller software So far we’ve looked at the hardware design, but aside from modifying the oven in part 1, nothing has been built yet.