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Author Topic: Detecting 240v  (Read 509 times)
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I'm trying to design an Arduino-based central heating controller. I've worked out (I think) turning things on and off, but I'd like to be able to detect whether there is voltage across the terminals leading to the thermostat on the hot water tank. Has anyone got any advice for that? It's literally a 240v thermostat switch being supplied power. When cold enough, there'll be current and I want to detect that current to make decisions in software about whether to turn the hot water on or not.

Many thanks in advance.

Neil.
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you can use something like this

http://www.digikey.com/product-detail/en/L01Z600S05/MT7180-ND/529412?cur=USD

which can also be made, just run your wire though it and it outputs 0-5 volts perfect for analog input
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The last thing you did is where you should start looking.
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Quote
I'd like to be able to detect whether there is voltage across the terminals leading to the thermostat on the hot water tank.
Quote
I want to detect that current
Do you want to detect the Voltage or Current?

You can detect the voltage with an opto isolator which is monitored by the Arduino.


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The way you have it in your schematic isn't the same as how you have it wired up!

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