Onboard battery slot support various power supply; Lead out all IO convenient to use; With basic LED and buttons; With reserve sensor interface convenient to connect various sensors. Interfaces: Core board slot: convenient to connect to Core2530 and XCore2530; 8I/Os+ADC interface: for carious I/O control module such as 8bit button motor control module etc; SPI + UART interface: for various modules w/ SPI interface and modules w/ USART interface; Debug interface: support download and debug; USB: adapt to UART interface via onboard CP2102 USB to UART chip; LCD: for 2.2" LCD; Sensor interface: for various sensor module; MCU: for I/O connection; 1-WIRE interface: for 1-WIRE devices (TO-92 packing) such as temperature sensor DS18B20 DS2401; 5V /3.3V power port: external power supply Parts: Power LED UART1 LED user LED power switch CR1201 USB to serial chip AMS1117-3.3 3.3V regulator part reset button user keys joystick (up / down / left / right / press) Jumper cable: USB to UART user LED jumper user key to joystick jumper Jumper above instructions : Short jumper : access to the sample program specified I / O; Disconnect Jumper : You can use connection cable to access custom I / O.