Higher input voltages will cause the on-board regulator to work harder and may cause it to overheat. If an external supply is used, it is recommended to use a supply between 7-12V. ![]() The power source is selected automatically if both are available. The Uno R3 SMD operates at 5V which can be supplied via an external power supply or through the USB port connection. 6 Analog inputs that can also be used as digital I/O for a total of up to 20 digital I/O.It uses an SMD version of the microprocessor rather than the older style DIP package used on the original product and has some additional features. ![]() The Uno R3 SMD is an Uno compatible version of the latest R3 iteration of the Arduino Uno, which is the most popular of the many development boards available for hobbyists.
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