Hi. I would like to connect a pH probe to an Arduino Uno for pH data logging, but I also need to use the probe for pH control. I'm wondering if I could use a BNC splitter and a BNC male to male cable to connect the probe to both the Uno and the controller. Could something like this work? Or is there any other way to achieve this? Any and all help will be greatly appreciated. Thank you.
Welcome to the Arduino forum! Good question.
Since you are dealing with direct current, DC, there is no problem in putting as many BMC devices in parallel as you need. Use a BNC "T" connector to put two BNC connectors in parallel. Use any cables that are necessary.
You only run into problems when using radio frequencies in the coax cables.
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Paul, this raises a side question.
I wonder why BNC connectors became the de facto standard for pH probes in the US. Perhaps the first few manufacturers had a bunch they could get cheaply?
Nope! Quick and easy connection for shielded coaxial wire. Just for information, there are BNC connectors for 50 Ohm coax and for 75 Ohm coax. Same on outside and each will mate with the other, but the insides are different diameters. For your application, the difference is ignored.
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In order for me to understand what you have and how you are wanting to connect it, you must make a block diagram of all the pieces and show how you connect them and the voltages on the wires making the connections.
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