hiletgo 3pcs pro micro atmega32u4 5v 16mhz bootloadered ide micro usb pro micro development board microcontroller compatible to arduino pro micro serial connection with pin header hiletgo <b>description:</b><br> 1. the pro micro is similar to the pro mini except with a 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. <br> 2. 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. if you're supplying unregulated power to the board, be sure to connect to the "raw" pin on not vcc. <br> <b>features: </b><br> atmega32u4 running at 5v/16mhz<br> supported by arduino ide v1.0.1<br> on-board micro-usb connector for programming<br> 4 x 10-bit adc pins, 12 x digital i/os<br> rx and tx hardware serial connections<br> <b>note: </b> 1.when you open the arduino ide software, pls go to the tool and choose the board "arduino leonardo" <br> 2.the acceptable voltage range is 5 to 9 v.<br><b>package included: </b><br> 3* pro micro atmega32u4 5v/16mhz development board<br>