Item Type: Multifunction Expansion Board Material: Resin The Functional Modules Are as Follows: 2-way button module 2-way LED module Full color LED module Infrared receiver module Brightness sensor module LM35D temperature sensor module: Passive buzzer module Rotary potentiometer module Temperature and Humidity Sensor Module: 1 x I2C Interface (A4 SDA/A5 SCL) 1 x TTL serial port 2 x Digital ports (D7/D8) 1 x Analog port (A3) Reset button1Expansion board integrates multiple module functions, nine kinds of functions concentrated in this one module. 2No welding, no connection, just download the program directly to complete the experiment. 3Expansion ports are reserved, and other module experiments can be completed. 4Custom heightened pin headers will not short circuit with the USB interface of the other board. 5Small in size and light in weight, convenient to carry and use at any time, very convenient and practical. 1 x Multifunction Expansion Board