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Post: Hello Harvey I don't know of any 1-wire devices that will measure pressure directly. Maxim used to make a DS2450 1-wire 4-channel ADC which could be used to measure the voltage from any pressure sensor that gives an analogue voltage but it looks like the chip has been discontinued so you would have to find someone with old stock. If you only need to know when the pressure drops below a safe level you could use a pressure switch connected to a [url=https://www.analog.com/en/products/ds2413.html]DS2413 [/url]dual-channel programmable I/O 1-wire chip. Select a pressure switch that switches at your minimum safe pressure and connect the output to one of the inputs on the DS2413. When the pressure drops below the limit the value on the DS2413 would change from 1 to 0. With OWFS installed the DS2413 would appear as a directory beginning with 3A in /mnt/1wire. Each input is called sensed.A and sensed.B so to read an input you would open file /mnt/1wire/3A.9D3F57000000/sensed.A and read a value of 0 or 1. You can do this in python using the [url=https://www.w3schools.com/python/python_file_open.asp]open function[/url]. The DS2413 will not tell you what the pressure is exactly but it will allow you to check if the pressure drops too low. I use one of the DS2413 chips on my solar heating system to tell me if the pump is running.