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+--- Thread: KC868-A16 V1.5 I2C PCF8574 address updated (/showthread.php?tid=2128)
KC868-A16 V1.5 I2C PCF8574 address updated - admin - 08-16-2022
some of KC868-A16 V1.5 hardware version, PCF8574 address is changed. (if you have seen PCB is V1.5 and have GREEN label, you need to use new address value)
before is :
Relay_IIC_address 0x24
Relay_IIC_address 0x25
Input_IIC_address 0x21
Input_IIC_address 0x22
new is :
Relay_IIC_address 0x3C
Relay_IIC_address 0x3D
Input_IIC_address 0x39
Input_IIC_address 0x3A
if you don't know your PCF8574 address, you can use this "I2C scan" arduino IDE source code to scan address, it will print value by serial port.
here is source code:
i2c-scan-a16.zip (Size: 645 bytes / Downloads: 432)
RE: KC868-A16 V1.5 I2C PCF8574 address updated - LTDU - 03-31-2023
FYI, one address was different for my board (hardware rev 1.5) thus failing to initialize: 3B, instead of 3A.
Code:
I2C scanner. Scanning ...
Found address: 57 (0x39)
Found address: 59 (0x3B)
Found address: 60 (0x3C)
Found address: 61 (0x3D)
Found 4 device(s).RE: KC868-A16 V1.5 I2C PCF8574 address updated - admin - 03-31-2023
it's normal, some times different chip have different I2C address.