DFRobot FIREBEETLE BOARD-ESP32 - Page 5

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 IO3/RXD：D0(Arduino), the RX of Serial, connects to IO3 of ESP32
 IO1/TXD：D1(Arduino), the TX of Serial, connects to IO1 of ESP32
 IO25/D2：D2 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO25 of ESP32.
 IO26/D3：D3 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO26 of ESP32.
 IO27/D4：D4 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO27 of ESP32.
 IO9/ D5: D5 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO9 of ESP32.
 IO10/D6：D6 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO9 of ESP32.
 IO13/D7：D7 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO13 of ESP32.
 IO5/D8：D8 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO5 of ESP32.
 IO2/D9：D9 (Arduino) of GPIO digital input and output port and PWM output pin, connect to IO2 of ESP32.
 CLK：Clock pin to IO6 of ESP32
 SD0：SD0 port to IO7 of ESP32
 SD1：SD1 port to IO7 of ESP32
 CMD：CMD port to IO11 of ESP32
 GND：Power line ground
 AREF：input voltage for reference, here connect to NC.
 3V3：3.3V Vo, can provide 600mA current out at most.
 VCC：The Vi/Vo is 5V charged by USB and 3.7V charged by lithium battery.
 IO36/A0：A0 (Arduino), analog input, connect to IO36 of ESP32.
 IO39/A1：A1 (Arduino), analog input, connect to IO39 of ESP32.
 IO34/A2：A2 (Arduino), analog input, connect to IO34 of ESP32.