Smart Home Automation Forum

IIC Bus:

SDA:GPIO48
SCL:GPIO47

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-wire(TMP1):GPIO18
1-wire(TMP2):GPIO8


free GPIOs (without pull-up resistance on PCB):
free gpio-1:GPIO4
free gpio-2:GPIO5
free gpio-3:GPIO6
free gpio-4:GPIO38
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Ethernet (W5500) I/O define:

clk_pin: GPIO42
mosi_pin: GPIO43
miso_pin: GPIO44
cs_pin: GPIO41

interrupt_pin: GPIO2
reset_pin: GPIO1

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RS485:
RXD:GPIO15
TXD:GPIO7

4G module:
RXD:GPIO9
TXD:GPIO10

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

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Relay1:GPIO40
Relay2:GPIO39

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digital input-1:GPIO16
digital input-2:GPIO17