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Product description Specifications Microcontroller: ATMEGA328P Power: 5V Recommended power: 7-12V Power limit: 6-20V Digital Pins (In/Out): 14 (6 with PWM) Analog inputs: 6 Maximum current per pin: 20mA Flash memory: 32KB SRAM: 2KB Clock: 16MHz It is quite common for compatible Arduino boards to include the CH340 chip instead of the FT232RL that the original Arduino boards have. These chips are responsible for managing the USB interface of the board. Since these chips manage the communication between our Arduino and the PC, we must have the appropriate driver installed for them to work without problems. Compatible Arduino boards work correctly on some system versions and with some versions of the IDE. However, there are some system-IDE combinations where the original Arduino IDE is not able to communicate with our compatible Arduino board. To solve the problem we must download the CH340 driver from the manufacturer's website (WCH). Here are the download pages: To install it we will follow the following steps: 1. Connect the compatible Arduino board to the USB port. 2. Install the corresponding driver according to the operating system. 3. Reboot the system. 4.Open the Arduino ID and in the Tools menu select the appropriate Arduino board and the corresponding port. 5. Once the CH340 driver is installed, we should be able to communicate with our compatible Arduino board without problems. Features The Arduino Uno R3 is a micro-controller board base on the ATmega328 . It has 14 digital input/output pins (of which 6 can be used as PWM outputs); 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything need to support the micro-controller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get start. The Arduino Uno R3 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmeg.