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+--- Thread: MT4v2 ESP32-S3 IO pins define (/showthread.php?tid=9877)
MT4v2 ESP32-S3 IO pins define - admin - 10-20-2026
IIC Bus:
SDA:GPIO8
SCL:GPIO18
24C02 EPROM i2c address: 0x50
-----------------------
PCF8574: i2c address:0x22
PCF8574->P0 (digital input-1)
PCF8574->P1 (digital input-2)
PCF8574->P2 (digital input-3)
PCF8574->P3 (digital input-4)
PCF8574->P4 (digital input-5)
PCF8574->P5 (digital input-6)
PCF8574->P6 (digital input-7)
PCF8574->P7 (digital input-8)
-----------------
Ethernet (W5500) I/O define:
clk_pin: GPIO1
mosi_pin: GPIO2
miso_pin: GPIO41
cs_pin: GPIO42
interrupt_pin: GPIO43
reset_pin: GPIO44
--------------------
RS485:
RXD:GPIO38
TXD:GPIO39
Tuya module:
RXD:GPIO7
TXD:GPIO6
Tuya network button: Tuya module's P28
Tuya network LED: Tuya module's P16
--------------------
1-Wire-TEP1:GPIO40
1-Wire-TEP2:GPIO17
1-Wire-TEP3:GPIO48
1-Wire-TEP4:GPIO47
--------------------
433MHz RF receiver: GPIO14
IR receiver: GPIO13
DL(download) button: GPIO0
---------------------
ARM CPU RXD: GPIO15
ARM CPU TXD: GPIO16
115200bps
--------------------
SD Card:
SPI-MOSI:GPIO10
SPI-SCK:GPIO11
SPI-MISO:GPIO12
SPI-CS:GPIO9
SPI-CD:GPIO5