KC868-A16v3 ESP32-S3 IO pins define

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ANALOG_A1  4
ANALOG_A2  6
ANALOG_A3  7
ANALOG_A4  5

IIC Bus:

SDA:GPIO9
SCL:GPIO10

Relay_IIC_address 0x24
Relay_IIC_address 0x25

Input_IIC_address 0x21
Input_IIC_address 0x22

24C02 EPROM i2c address: 0x50
DS3231 RTC i2c address: 0x68
SSD1306 display: i2c address:0x3c

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1-wire (pull-up resistance on PCB):
1-wire1:GPIO47
1-wire2:GPIO48
1-wire3:GPIO38

free GPIOs (without pull-up resistance on PCB):
free gpio-1:GPIO39
free gpio-2:GPIO40
free gpio-3:GPIO41
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Ethernet (W5500) I/O define:

clk_pin: GPIO42
mosi_pin: GPIO43
miso_pin: GPIO44
cs_pin: GPIO15

interrupt_pin: GPIO2
reset_pin: GPIO1

--------------------
RS485:
RXD:GPIO17
TXD:GPIO16

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SD Card:
SPI-MOSI:GPIO12
SPI-SCK:GPIO13
SPI-MISO:GPIO14
SPI-CS:GPIO11
SD-CD:GPIO21

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RF433MHz wireless receiver: GPIO8
RF433MHz wireless sender: GPIO18

free gpio on PCB (beside ESP32-S3 module)
GPIO39
GPIO40
GPIO41