The JOY-iT Explorer 700 Expansion Board for Raspberry Pi expansion board has the following functions:

Pin-Header to put directly on the Raspberry Pi B+, 2B, 3B or 4B
UART interface: connect easily UART modules like for example RS232, RS485, USB to UART (TTL-cable)
AD/DA IO interface: connected cable via screws definable
1-WIRE interface: to connect a 1-WIRE device
Sensor interface: digital and analogue sensors can be connected
0.96 inch OLED display: SSD1306 Driver, 128 x 64 Pixel, SPI interface
Buzzer
USB to UART, converter with CP2102 chipset (mini USB-Port)
PCF8591: 8-bit analog / digital converter, I²C interface
BMP180: sensor for atmospheric pressure, temperature and height over normal zero, I²C interface
PCF8574: I/O Chip for I²C interface
DS3231: high precision RTC chip, I²C interface
Power LED
Programmable LED
Joystick
LFN0038K IR infrared receiver

Interfaces	UART, AD/DA: connected cables can be fixed with screws, 1-Wire, Sensor
Display	0.96“ OLED Display (SSD1306 Driver, 128x64 Pixel)
Dimensions	85 mm x 56 mm x 17 mm
Weight	30 g

For more information, check out the user manual here.

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