KC868-E8T ESP32 and Tuya I/O pin define

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IIC SDA:4
IIC SCL:5

Relay_IIC_address 0x24

Input_IIC_address 0x22

OLED address: 0x78

DS3231 RTC address: 0x68

DS18B20/DHT11/DHT21/LED strip : 14

RF433MHz wireless RXD: 32

4G module RXD: 35
4G module TXD: 15

TUYA module RXD: 16
TUYA module TXD: 13

RS485 RXD: 34
RS485 TXD: 2

energy meter 1-2 channel RXD: 39
energy meter 1-2 channel TXD: 12

energy meter 3-4 channel RXD: 36
energy meter 3-4 channel TXD: 33

Ethernet (LAN8720) I/O define:

#define ETH_ADDR        0
#define ETH_POWER_PIN  -1
#define ETH_MDC_PIN    23
#define ETH_MDIO_PIN  18
#define ETH_TYPE      ETH_PHY_LAN8720
#define ETH_CLK_MODE  ETH_CLOCK_GPIO17_OUT