3PCS Pro Micro 5V 16MHz Module Board 2 Row Pin Header for Arduino Mini Leonardo

Great product at a fantastic price. I recently bought 1 Pro Micro for $19.95 and then found these at $4 each when you buy 5. Fantastic.I have only tested the one so far, but it worked perfectly. Dropped the same code as I have on my Pro Micro. Fired it up and it runs great.I will be buying more of these in the future at this great price. Each was in it's own sealed anti-static bag and all 5 were in one box inside an outer box. Each of the devices came with two sets of pin headers.####################### EDIT ##########################################Initially I did not notice that when I unplugged the Micro boards and then plugged them back in then my program would not run again. At first I thought my sketch was being erased or something. I noticed other reviewers mentioned the problem aslo so I did some research. These are such a great price, but if they only run your program once then they are mostly useless.UpdateBought another batch of 5 of the Pro Micro ATmega32u4 and this time the bootloaders are all there as they should be. The show up as a normal Leonardo now and you can flash them and unplug them and your program will start again when you apply power to the chip the next time.These are a great product at a great price. 5Stars ++###########################After posting a question on Electrical Engineering Stack Overflow I was able to get a definitive answer and fix the boards so they'll run your code after losing power.The Actual ProblemThe problem is that the bootloader the manufacturer chose basically waits forever upon power up for a new program to be loaded. Most people are probably expecting it to wait to have a program loaded (via Arduino IDE for example) for a few seconds and then if it doesn't to go ahead and run the program already stored in its flash.So, the point is, these boards need a new bootloader.Specifically, they need the bootloader which can be found in the following zip file from the SparkFun site:[...]Once you get that file, go into the \sparkfun\avr\promicro\ folder and get the hex file named caterina-promicro16.hex.That's the bootloader that works great. I successfully flashed it into my boards and they work perfectly fine now.For all of the details on how to flash the bootloader into your boards you can read my answer on the stack exchange site at: [...]

Great little micro! They work great with Arduino's IDE, and with free serial monitor apps on Android phones.For my project, I made these simple dmx testers. With 3d printed the enclosures and the micro, they're very handy and compact!

If you're new to Arduino's, an Arduino UNO is your best bet to learn on. But if you're even somewhat familiar with Arduinos and want to use an Arduino board for a dedicated project then this'll do nicely.And for what it does, this is a very good deal. The Teensy 3.2 is better, but costs about 5 times more, and is overkill for some uses that don't need the higher speed.Aside from using it for typical Arduino things, this is great to use for building your own USB gamming control panel because Windows, and probably Apple, will recognize it as an HID device like a keyboard, mouse, or game controller, unlike most Arduinos.Actually, it can even be programed to send key strokes, so you could even build a CAD or Photo Shop controller. Basically, any program that can take a key press.NOTE: The description says "Supported under Arduino IDE v1.0.1". They should remove that, because this works with the newest software from Arduino.cc,NOTE: ***READ*** the description where it says "When you open the Arduino IDE software, pls go to the Tool and choose the board "Arduino Leonardo". If you select "Arduino Micro" in the Arduino IDE software it won't work. But don't worry, this IS NOT an old "Leonardo" setup.NOTE: If you aren't used to soldering pins onto one of these boards, either have someone do it for you, or use the Arduino LED "blink" sketch to test EACH pin before you say that this board is bad/junk/etc. Mistakes are very easy to make, and you might not see your mistake.

Have purchased these twice now. Have read a few people mention for other products the risk of getting a dud board. Found these were great and no issues. In the customer comments there was a command for flashing them which I have resorted to a few times on my mac just like the following:avrdude -c avr109 -p atmega32u4 -P /dev/cu.usbmodem1 -U flash:w:filename.hexGround pin 3 and as it flashes you should see the /dev device appear. One thing to note is that sometimes it didn't release the device so when you reset it it would increment the device with a counter like modem1..modem2..modem3.. this means you have to do a quick check of the new device name or take a guess at the next number. If you don't flash it in a few seconds you have to try again. If you are using the Arduino IDE or a more modern build approach that waits for you to reset you wont have to worry.I used these in a keyboard experiment that I'm typing this review on.

Cette carte est en effet détecté comme un arduino pour une fraction du prix. Pour tout ceux qui aime bricoler c'est là une économie non négligeable

it works... but you can see it has bad soldering all over.

La he utilizado para hacer un touchpad USB y funciona genial.Los LEDs TX y RX están conectados al revés que el Micro Genuino, así que si utilizas los parámetros oficiales las luces estarán encendidas por defecto y se apagarán cada vez que pasan datos. Esto se puede solucionar buscando el archivo micro/pins_arduino.h y intercambiando las definiciones de TXLED0 con TXLED1 y RXLED0 con RXLED1.

Funktioniert nur halb, wenn ich den Chip auf ein Bord ohne Verbindungen löte, bekomme ich Errors. Als HID sollte man es nicht verwenden.

purchased this to run and adafruit nanopixel ring in a garden project. works perfectly. initially had problems with sketch loading until i followed the instructions properly and ran it as an arduino leonardo board