8/7/2023 0 Comments Arduino pro micro pinoutYou have to make solder bridge on J1 and get power from VCC(instead of RAW) pin unless you have external power supply. The 4.6V is still enough for ATmega32u4 itself but some of keyboards that require proper voltage may not work with random problems. The 4.6V is obviously not enough to get 5V from the regulator. As shown in its schematic the regulator is given power from USB line through protection diode D2(and resttable fuse F1) and gets only around 4.6V due to it forward voltage drop. Pro Micro has unknown LDO voltage regulator on its PCB.Īs for 5V version the regulator is used for external power input(6V-12V) from RAW pin, not for USB power line(bus power application) by design. Use VCC pin to power 5V onto keyboard, instead of RAW pin. Note that ATmega32u4 pinout PD0, PD1 and PB6 are maked on Pro Micro PCB as 3, 2 and 10 respectively. This is good and SparkFun is reliable but PJRC Teensy 2.0 is still preferable and easy to program for beginners. Legitimate SparkFun Pro Micro doesn't have this problem. (You may see 5V at RAW pin which is given backward through regulator, but the voltage will drop when supplying power to keyboard and is not good for powre source even with the solder bridge.) 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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