DFRobot FIREBEETLE BOARD-ESP32 - Page 6

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 IO35/A3：A3 (Arduino), analog input, connect to IO35 of ESP32.
 IO15/A4：A4 (Arduino), analog input, connect to IO15 of ESP32.
 NC：Not connected
 IO0：Digital interface, connect to IO0 of ESP32.
 SCK：Clock pin of SPI, connect to IO18 of ESP32.
 MOSI：SPI’s MOSI data-wire, connect to IO23 of ESP32.
 MISO：SPI’s MOSO data-wire, connect to IO19 of ESP32.
 SDA：I2C’s data-wire, connect to IO21 of ESP32.
 SCL：Clock pin of I2C, connect to IO22 of ESP32.
 BCLK：Clock pin of I2S, connect to IO14 of ESP32.
 MCLK：Clock pin of I2S, connect to IO12 of ESP32.
 DO：DO data-wire of I2S, connect to IO4 of ESP32.
 DI：DI data-wire of I2S, connect to IO16 of ESP32.
 LRCK：LRCK data-wire of I2S, connect to IO17 of ESP32.
 RST：Low level reset port.
For master control board of the FireBeetle, we have reserved external DC ports for more
complex projects, supporting other peripheral chargers such as wireless charging module and
solar charging module.
Caution: + should be connected to the positive pole of the external charger;
- should be connected to the negative pole of the external charger.
The input voltage is from 4.7V to 6V.