1. Introduction
The EX-U+A1 expansion board is a matching expansion board designed based on the U+ PROGRAM CARD development board, integrating the pins of the development board onto a PCB circuit board.The circuit board has both pin interface and 2 types of power interfaces, meeting the different wiring needs of users.The user can flexibly add and remove external expansion modules.Adapter power interface: DC005/5.5-2.1MM.Lithium battery powered interface: XT-2.54-2P.Supply interface input voltage range: 6-12V.Board power module output power: 5V/2A.I/O interface: 2.54 pitch interface, 2.54 pitch socket size: 65 mm*45 mm*19 mm.
2, Characteristics
1, digital IO pins (pins from D2 to D13) and analog IO (pins from A0 to A5) pins are provided. (It can meet the need of connecting extension modules with Dupont wires.)
2. The outside retains 4 4P headers for convenient connection with the communication module.
3, It has a 3.3V power pin that can be used for modules with small external current requirements.
4, The power interface has 2 interfaces, namely adapter power supply interface and lithium battery power supply interface.
3, Expansion Board Parsing
Digital IO pin (D2-D13)
You can specify these IO ports as digital outputs, that is, output high level or low level.The D3 pin can be used as a hardware interrupt pin.D3, D10, D11 pins can output analog signals.
Analog IO pin (A0-A5)
You can specify these IO ports for simulated input and simulated input. The simulated input returns a value of (0-1023). The simulated output value is (0-255).
Adapter power supply interface
DC005/5.5-2.1MM. Power supply interface input voltage range: 6-12V.
Lithium battery powered interface
XT-2.54-2P. Input voltage range of power supply interface: 6-12V.
4P header pins
VCC/A0/A1/GND,D1/D0/GND/VCC,SCL/SDA/VCC/GND,for connecting to external modules.GND/3.3V/GND/3.3V is used to power the external module.