UNO Plus from Waveshare
UNO PLUS is a development board compatible with the Arduino UNO R3.

UNO Plus versus Arduino UNO
What are advantages of the UNO plus over the Arduino UNO?
What is the UNO Plus
ATMEGA328P-AU
AMS1117-3.3 : 3.3V voltage regulator
NCP1117ST50T3G : 5V voltage regulator
FT232RL : USB to UART convertor
Arduino interface - compatible with standard Arduino interface with two additional analog inputs A6 (config the CFG), A7. solder pads provided, supports prototype breadboard
ICSP interface
MICRO USB connector : for uploading program OR serial port debugging
Power output header : 3.3V OR 5V, voltage level configured by the onboard power configuration switch, used as power output OR common-grounding with other boards
FT232 pins : for burning Bootloader into the microcontroller
DC input : 7V ~ 12V
Reset button
Power indicator
Serial port Rx/Tx indicator
User LED
500mA fast self-recovery fuse
Power configuration : for configuring the operating voltage
Bootloader selection switch
turn ON : the board will reset when power-up OR other USB devices were detected connecting to the PC
turn OFF : the onboard program runs immediately when power-up, and the board will not reset when other USB devices were detected connecting to the PC
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