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Post: The Ezo PH board does not support 1 Wire so you can not connect it to the Raspberry Pi through the 1 Wire Pi but it does support I2C and UART so you can connect it directly to the GPIO header on your Raspberry Pi. The easiest way to connect the board would be to use the UART bus which is pins 8 and 10 on the GPIO header. You will need to connect the Vcc pin on the board to pin 1 or 3.3V on the Raspberry Pi GPIO, GND connects to pin 6 on the GPIO header, RX goes to pin 8 and TX goes to pin 10. You can find a list of the GPIO pins at [url=https://pinout.xyz/]Pinout.xyz/[/url] Just make sure you are powering the board from the 3.3V pin and not 5V otherwise you could damage the UART pins on the GPIO header. To use the UART bus on your Raspberry Pi you will first need to enable it and disable the console mode which is what Raspbian Linux is set to by default. We have a tutorial in our Knowledge Base for [url=https://www.abelectronics.co.uk/kb/article/1035/serial-port-setup-in-raspberry-pi-os]setting up the serial port on a Raspberry Pi.[/url]