Hi, I am new to the forum and not super versed in circuit design, but excited to learn more here.
I have been trying to design an optocoupler circuit to allow me to "listen" in on my 24v Thermostat calls to my Taco ZVC405-4 zone valve which controls my radiant hydronic heating in my home. I would like to be able to watch for the calls via an Arduino microcontroller.
I have done a number of Arduino (low voltage) projects, but am trying to make sure I go about tying into a line voltage system with good isolation. Attached is a quick schematic I came up with based on some other research I have been doing on the Arduino forum for this design. However, I am not sure how to calculate the Resistor values properly given the two sides of the optocoupler. I may also have some flaws in my layout, If you can offer any advice and assistance on the design, I would really appreciate it.
Thanks!
I have been trying to design an optocoupler circuit to allow me to "listen" in on my 24v Thermostat calls to my Taco ZVC405-4 zone valve which controls my radiant hydronic heating in my home. I would like to be able to watch for the calls via an Arduino microcontroller.
I have done a number of Arduino (low voltage) projects, but am trying to make sure I go about tying into a line voltage system with good isolation. Attached is a quick schematic I came up with based on some other research I have been doing on the Arduino forum for this design. However, I am not sure how to calculate the Resistor values properly given the two sides of the optocoupler. I may also have some flaws in my layout, If you can offer any advice and assistance on the design, I would really appreciate it.
Thanks!