05-26-2022, 10:45 PM
if you want to extend input ports, here two ways:
1. add a board connect to network cable with your router.
2. use IIC extender, such as PCF8574 or PCF8575 small board connect to "IIC extend interface " on the PCB board.
if you want to use 1 wire temperature sensor, such as DS18B20 or DHT11/21, you can connect to "serial port extend interface" on the PCB board. there are two free GPIO pins for use, now is use for TXD,RXD, but actually you can use for yourself.
1. add a board connect to network cable with your router.
2. use IIC extender, such as PCF8574 or PCF8575 small board connect to "IIC extend interface " on the PCB board.
if you want to use 1 wire temperature sensor, such as DS18B20 or DHT11/21, you can connect to "serial port extend interface" on the PCB board. there are two free GPIO pins for use, now is use for TXD,RXD, but actually you can use for yourself.