KC868-AM ESP32 I/O pin define

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Relay1:15

1-wire GPIO for DS18B20/DHT11/DHT21/LED strip -1: 5
1-wire GPIO for DS18B20/DHT11/DHT21/LED strip -2: 14
1-wire GPIO for DS18B20/DHT11/DHT21/LED strip -3: 13
1-wire GPIO for DS18B20/DHT11/DHT21/LED strip -4: 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

RS485:
RXD:35
TXD:32

IIC BUS:
SDA:4
SCL:16

free GPIOs on PCB hole:
I36
I37
I38
I39
I34