Description: Here at SparkFun, we refuse to leave ‘good enough’ alone. That’s why we’re adding to our line-up of Arduino-compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface.
This tiny little board does all of the neat-o Arduino tricks that you’re familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere. There is a voltage regulator on board so it can accept voltage up to 12VDC. If you’re supplying unregulated power to the board, be sure to connect to the “RAW” pin on not VCC.
This latest revision corrects the silk error from the last version of the board so that pin 14 is correctly labeled. We’ve also added a PTC fuse and diode protection to the power circuit and corrected the RX and TX LED circuit.
Not sure which Arduino or Arduino-compatible board is right for you? Check out our Arduino Buying Guide!
Based on 3 ratings:
I needed something small with USB onboard to control a strip of NeoPixels.
My project uses a small C# program to communicate over serial with the Arduino which drives the pixels. I wanted something small and this was the only Arduino I could find to fit the bill. The trinket doesn’t have serial and the pro mini would tie up my programmer.
That being said, I have had some issues with this showing up in the device manager and for that reason I don’t think I would have this as my only arduino. I think your best bet would be to prototype with something like a RedBoard and port your over to this little guy. If I have another project that needs serial communication or USB power I would definitely use one of these. Otherwise I would probably go with a Pro Mini if I needed a small dedicated arduino to stick in a project.
Extremely small and still had all the power I could ever need for my project.