I am trying to grasp whether this project is feasible through an Arduino or not. I simply have two analog sensors that output 0-10V. I cannot use the 0-5V analog inputs as is, so I would have to use a voltage divider to cut the voltage in half or more.
Where I come to my conundrum is not having a common ground (I think). Both sensors take 24VDC as their supply can output 4-20mA or 0-10VDC. Below is the wiring schematic for the sensors and my sketch of what this would look like.
I hope I am missing something obvious, but I cannot seem to find the answer myself.
You do realize power supply A has a + and - as well, right? The - shell of the connector is your ground, but it's more accessible on the Uno pins.
Almost all small DC supplies using the barrel connectors these days are "Class 2" isolated, so neither supply will care about the connection to the other supply.
Hi,
The 5V feed into the UNO needs to go in at the 5V pin of the UNO.
The DC socket needs 7V or more as it feeds a linear 5V regulator.
You also need a gnd connection between the 5V DC-DC converter and the UNO.
Not trying to insult, we see a wide variety of knowledge and comprehension on this forum. Not checking is a form of ASSumption.
And Tom is right, your 5V needs to be higher. Unfortunately, the next common value is 12, but that's high. Aim for 7-9 volts, as your regulator on the Uno will run cooler.
Or, as Tom says, connect to the 5V pin.
