High Power Independent Power Supply Expansion Board For Arduino UNODescription:1. This product is the latest version for Arduino UNO interface series、 and it has the following new features compared with other version:      - The power supply core of the expansion board is  AMS1117-5.0  and AMS1117-3.3、 which is completely the same as bread board's power supply module 、 and it has the          ability to supply power independently、 and has solved the problem of mainboard getting fever because of overload as well as insufficient power supply.      - Also、 it has 14 channel of digital input \/ output ports (of which 6 can be used as PWM output channel)、 6 channel of analog inputs、 a I2C interface、 a DC power socket、 a          ICSP and a reset button.      - Added two pins: SDA and SCL、 support I2C interface.      - Added jumper adapter power supply socket、 expansion board will be compatible with 5V and 3.3V core board、 and other related modules.      - Improved circuit design、 and IO power indicator、 the electrolytic capacitor can be further filtered for the poor quality of power supply、 improve power supply environment2. External DC power supply uses DC socket to supply power.3. Working voltage: 5V4. Input Voltage: 6~18V(recommended 9~12V) 、 and please do not exceed this range.5. Arduino UNO can be powered by expansion board、 and can also be self-adapted to the power supply mode.6. Power pin description:      - VIN --- when an external DC power supply access to power socket、 can supply power to external through VIN. This pin can also directly supply power to the UNO. VIN will         ignore the power supply from the USB or other pins when there is power      - 5V --- supply power to Arduino through the voltage regulator or USB's 5V voltage      - 3.3V --- 3.3V voltage generated by voltage regulator      - GND --- ground7. Working voltage is 5V、 14 channel digital IO are the same as the mainboard. each of them configured independent VCC and GND (VCC can choose voltage (3.3V and 5V)     through the jumper.you can only choose one voltage through the jumper、 2 or more choices are not allowed).8. Serial signal RX (0)、 TX (1): connected with the internal ATmega8U2 USB-to-TTL chip、 to provide TTL voltage level serial port to receive the signal.9. PWM (3、5、6、9、10、 11): provide 6 channel of 8-bit PWM output.10. LED (13):  reserved interface which Arduino designed for testing LED、 LED lights on when output is high、 and lights out when output is low.11. Six channel analog inputs A0 to A5: each channel has 10-bit resolution (i.e. 1024 different input values)、 the default input signal range is 0 to 5V.12. Support Communication Interface: SDA A4 and SCL A5 (compatiblewith I2C bus、 VCC of I2C interface default 5V、 voltage choice of jumper will not affect it).Package included:1 !#!amp!*!times; Expansion Board