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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 8MHz and 3.3V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere.
This is the 3.3V version so, as always, keep in mind the limits of system voltage and so forth. The lower system voltage also has its advantages, though, like ease of use with many common 3.3V sensors. 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.
Not sure which Arduino or Arduino-compatible board is right for you? Check out our Arduino Buying Guide!
Note: See the GitHub link below for support with the Arduino IDE.
Based on 9 ratings:
1 of 1 found this helpful:
Fantastic board. Amazingly compact and powerful for its incredibility small size. Very low power requirements. 1 LiPo cell will power it.
1 of 1 found this helpful:
I used it to drive remote controls, connected to an Nrf24L01 and a couple of pots and buttons. Works very well and lasts a long time with a regular 9v battery.
1 of 2 found this helpful:
I have only had it for a few weeks so I cannot give a long term evaluation opinion but a few things surface pretty quickly. Initial setup was a bit bumpy but the documentation on the website explains all and you only have to follow thoroughly. The unit is small, light, provides decent functionality. The main issues I have with the unit so far: The micro USB connector… what went wrong there ? This must be the crappiest connector available on the market. I don’t even dare to remove the USB cable once it was plugged in. This connector will undoubtedly rip off the PCB after a few connects/disconnects. In expectation of that it would have been helpful to have the D+ and D- pins broken out so I can access them via header, but no. If this connector comes off it gets messy. Second.. What is the deal with those 5 pins that are not broken out and marked Not Used in the schematic ? I’d rather have access to those pins and have the PCB slightly larger than the way it is now. Timer 0 would be nice to use with two compare outputs (OC0A and OC0B or PB7 and PD0) but one of them is not broken out… Why ? It is still a nice unit but those two issues bother me already. So much for now.
I love the small form factor and native USB support. I’ve got mine acting as an I2C slave receiving commands from a Raspberry Pi.
I initially bought the pro micro 3.3v which worked for about 5 uploads then lost connection. Ho Yun “Bobby” Chan, provided excellent support. He got me a refund and recommended the pro mini with FTDI board which worked great. Great support, give Bobby a raise!!
Sorry you had an issue with your Pro Micro. I’m glad Bobby could help you out. He’s an awesome technician, and we appreciate his contributions to our Tech Support team. :) Thanks for the kind words.
Software set up and uploading was pretty straightforward, and it does its job well. - main issue is the flimsy micro USB connector, have to be extremely careful with it
Note for Ubuntu 14.04 users have to add some udev rules so that your OS doesn’t mistake the Pro Micro for a GSM modem (https://forum.arduino.cc/index.php?topic=217910.0)
We’ve tried many different Micro USB connectors to try to resolve the risk of popping the jack off the board. Unfortunately this tiny connector can be very hard to keep stable with such little solder points and without being in a enclosure designed to support the jack. One tip is to carefully tack the jack down with some hot glue. This will at least help support the jack better.
When I received it, I simply plugged it in and pulled out my iPhone. Using the official app I was able to simply connect to the device. Wonderful. Cannot wait to get making!
I haven’t used it extensively, but this cheap little board worked like a charm for all the small projects I have used it for. It’s tiny enough that you can embed it in any project, but it has enough broken out pins to to almost anything. Also the second hardware Serial proved to be really useful.
I received the board two weeks ago and it never worked. The board is not recognized at all. Sent an email Friday and still waiting to hear.