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Ever want to create a design that automates turning on or off an AC powered device such as a light or a heating system? Well this Instructable is for you! In this video we look at how to create a development board for switching on and off AC power. The switch is implemented with a TRIAC which is a semiconductor device so no moving parts like a relay based design.

<p>I mean I want two switches like</p><p>1. can be controlled with arduino(MCU)</p><p>2.physical spst switch</p>
<p>Yes you can add a mechanical switch in series or in parallel with the TRIAC.</p>
<p>The problem with series is both the physical switch and mcu has to be turned on to turn on load and for parallel switch both the physical switch and mcu has to be turned off. I am looking for XOR logic</p>
<p>How to add SPST switch to the switch board. So it can work as 2 way switch</p><p>thanks in advance</p>
Hello, I am afraid I don't understand the question. The TRIAC is a SPST switch. Note that AC voltage swings positive and negative so you have current flowing in both directions.

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