1、Can be seamlessly connected with mainstream controllers such as 2009 for LENARDO 2560 on the market. 2、4‑way LED indicator light (to know the importance of the LED indicator light, in the actual project, with this indicator light can directly use the indicator light to indicate the working status of the program, convenient for program debugging. 3、With DS18B20 temperature sensor interface, temperature measurement experiment can be done, DS18B20 components are not included. 4、With LM35 temperature sensor interface, can do temperature measurement experiment, LM35 components are not included. 5、3296 accuracy adjustable potentiometer, provide analog port input (can be used to control the brightness of LED, rotate the angle of the servo, digital voltage, etc.) 6、The infrared integrated receiver can be suitable for any infrared remote control experiment, this also does not include the integrated receiver 7、Four‑digit digital tube (using 74HC595 driver to save IO and learning SPI), can do digital tube display experiment (can display temperature, voltage, count value, etc.). 8、Three independent buttons, one reset button, you can do button experiment (man-machine interface). 9、The buzzer can be used for sounding experiments(can call the police, pronounce, etc.). 10、Bluetooth, wireless interface, voice module, voice recognition module, can be used for wireless communication experiments. 11、Have servo interface, convenient to drive the steering gear, with infrared detection interface, convenient to connect with the infrared, realize human flow statistics, etc. 1 x Multifunctional Expansion Board Kit Item Type: Multifunctional Expansion Board KitMaterial: ResinPower Supply Voltage: DC 5VFunctions: 1. The expansion board is directly connected with the LD3320 non-specific voice recognition module, which can realize voice control of the lights, which is necessary for smart homes. 2. The expansion board is directly connected to the Bluetooth wireless serial port module, which can control the light and the movement of the smart car with the mobile phone. 3. The expansion board is directly connected to the APC220 wireless serial port module to realize long-distance data transmission.Servo Interface: Convenient to drive the steering gearInfrared Detection Interface: Convenient to connect with the infrared