DESCRIPTION Features Open circuit diagram of the original design, the development of softwareinterface for free download, can also be in accordance with the requirementsand their modified, download the program is simple and convenient. Cansimply use sensors, all kinds of electronic components connection (such as: LEDlights, buzzer, buttons, photo resistance, etc.), make all sorts of interestingwork. Microprocessor controller, using high-speed development interface and theenvironment are very simple and easy to understand, very suitable for beginnersto learn. Performance Description Digital I/O Digital inputs/outputs were 0~13. Analog I/O Analog input/output: 0~5 Support ISP download function. The input voltage: when connected to the computer USB without external power supply, external power supply 7v to 12v dc input voltage. Output voltage: 3.3 V and 5 V dc voltage output dc voltage output. This the Arduino UNO R3 Reversion 3 it is an open source microcontroller developmentthat integrates all kinds of electronic components connection (such as: LEDlights, buzzer, buttons, photo resistance, etc.), make all sorts of interestingwork. Microprocessor controller, using high-speed development interface and theenvironment are very simple and easy to understand coming with acrylic case toprotect the board when you use it.