Gravity IO Shield for FireBeetle M0 & ESP32-E DFRobot Gravity DFR0762 IO Shield for FireBeetle M0 and ESP32-E is specially designed for FireBeetle 2 series (M0, ESP32-E). This Gravity IO expansion shield offers various ports, including digital, analog, I2C, UART, SPI, etc. Also, the DFRobot Gravity DFR0762 comes with a power input socket for connecting an external power supply and EN pin for cutting off the power supply to the mainboard.