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MPMPMP05/05/2019
I ordered two of these boards and they arrived much faster than I expected and were in good condition. They were individually packed in static bags and came with two header pins as shown on the product page.
Soldering them was easy - stick the pins into a breadboard and set the board down so the pins go through the holes. No need for any tools to hold everything in place.
Windows 10 recognized the boards and installed the correct drivers automatically; the Arduino application saw them too and I was able to program them immediately. It worked!
Note that while this board is compatible with a Leonardo (same MCU), the built-in LED on a Leonardo (on Pin 13) does not exist on this board.
I ran into some trouble with one of them that was entirely my own fault. Based on the silkscreen markings on the board and its size, I thought I'd try using the SparkFun Pro Micro drivers. Things worked fine until I programmed the board, after which Windows would no longer recognize it as a usable USB device. Turns out the SparkFun Pro Micro comes in two flavours: 5V/16MHz and 3.3V/8MHz, and the driver defaults to 3.3V/8MHz. The solution to the problem is to change the board type in the Arduino application back to Leonardo (5V), then ground the /RST pin twice, quickly. After that, the bootloader will wait for eight seconds for you to set the Arduino software to the correct COM port and upload your program, making sure you have the board type set to Leonardo. It took me a couple of tries but I brought the board back from the dead.
If you ever program your board and it no longer works and your computer can't seem to communicate with it anymore, try the above technique, or do a search for "pro-micro fail troubleshooting" it's where I got the above from.
This is a great little board with more pins than you'd expect for a device this small, and it plugs nicely into a breadboard, leaving plenty of room for other components.
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