Hi!
We would like to have two CT current sensors connected to the same arduino board. Is this even possible because we only have one 5v output, and therefore the voltage of one sensor will be effected by the other sensor. Has anyone ideas on how to do this?????
Thanks in advance.
Nik
Re: Two CT Current Sensors on the same Arduino board
Strange that this has not been answered already.
I have just built and deployed my first current only monitor. Works very nicely. However, our Canadian system is split phase 220 volt so I have two lines to monitor. I plan to put two CTs on one board using the single Arduino 5 volt supply. I think it should be possible to use the Arduino 5V side of the circuit as a common leg. For the second CT, an additional burden resistor, an additional jack for the second CT and second terminal for the analog out is all that should be required. I think.
I will be building this in the next few days. I will report back on results. I am not an electrical engineer.
Re: Two CT Current Sensors on the same Arduino board
I hadn't spotted that first post. The way to do it is like the emonTx or the emonTx shield, (Circuit diagrams are freely available http://openenergymonitor.org/emon/emontx/reference and http://openenergymonitor.org/emon/emontxshield) or better still to use an op.amp to generate a low impedance mid-point bias supply, see here: http://openenergymonitor.org/emon/node/673