Hi.
So I'm connecting my arduino to a 24VAC power supply.
Powering the arduino with a full wave rectifier and voltage regulator.
I want it to either provide or read a 0-10VDC signal where the 24VAC common is used as a voltage reference.
Typically control a 24VAC valve with 0-10V control signal or do readings from a 24VAC temperature transmitter with a 0-10V output.
Any advise on how this would be connected?
Using the GND after the full wave rectifier would make my output become a +5V to -5V output, right?
Tried googling and searching forums, but I haven't really found quite what I was looking for.
I want it to either provide or read a 0-10VDC signal where the 24VAC common is used as a voltage reference.
With a full-wave rectifier the AC & DC cannot share a common (you'd be shorting-out part of the bridge). With a half-wave rectifier you can share a common ground. Or if you have a center-tapped transformer, the center-tap can be connected to DC ground.
Typically control a 24VAC valve with 0-10V control signal
Assuming PWM is acceptable, you need a ~10V source and a transistor or MOSFET circuit to "boost" the Arduino's 5V output.
or do readings from a 24VAC temperature transmitter with a 0-10V output.
You can use a voltage divider (2 equal-value resistors) and in case you're not 100% sure about the 10V you might want to add an [u]over-voltage protection circuit[/u].
All right. Half-wave will probably be the best solution then..
24VAC is commonly used in automation panels and stuff, and if there is a center tap on the transformer, it's rarely used.
I think I'll be able to find some solutions to produce/read signals, the common ground thing was the one that really had me puzzled. Thanks. :]