![]() Use VCC pin to power 5V onto keyboard, instead of RAW pin. ![]() ![]() Make solder bridge on J1 immediately without asking questions if you don't want to check schematics or voltage with mulitimeter yourself. The low voltage may cause something wrong with old power hog keyboard.Ĭheap Pro Micro clones come without the bridge unfortunately, I believe it is just laziness or ignorance of its manufacturers or vendors. This is due to forward voltage drop of protection diode D2 in schematic below. Without the solder bridge cheap Pro Micro spit out only 4.6V instead of 5V at both VCC and RAW pin. Note that 5V Pro Micro has 5V-regulator and 16MHz-cyrstal while 3.3V Pro Mircor has 3.3V-regulator and 8MHz-crystal. There is no reason for you to select 3.3V one in most cases, for keyboard converter in particular. Pro Micro is generally compatible with this genuine Arduino board. If you have a plan to play with any Arduino project this is a better choice. This makes your life a lot easier than getting Pro Miro. You can support TMK keyboard firmware project with getting prebuilt converter from here. Go on! Alternatives to Pro Micro TMK Converters That being said, I know that people go with cheaper one and dare to walk into trouble. You will have various troubles on power line, reset to bootloader and flashing when you are careless or sloppy. I'm never willing to recommend you to use Pro Micro unless you are already familiar to it and have skill to solve problems yourself. You can support by getting Pro Micro from them, instead of clone manufacturers. They have good documentation for troubleshooting. ![]() Sparkfun is really reliable company and have made great contribution to hobby electroincs community. I believe that Pro Micro was designed originally by Sparkfun to be used with Arduino sketches and its IDE, and then it have been copied the design and manufactured cheapy clones by small unknown verdors. ![]()
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