Thursday, February 25, 2016

Use TRIAC as Relay

           Mostly we all use relays to control AC loads as they are widely available and cheaper.. But things becomes complicated as they are bulky and makes noise......everyone knows where i have placed my
relay...so what to do ??? you can say SSR right ? but i googled a lot and found out these are costlier so i thought of using TRIAC instead of Relay and after googling a bit i found it working....And that's what i was looking for my Wi-Fi powerboard that i am working on...And it's working all good...by the way i will post about that later.......

Circuit :




        Up there i have provided a schematic that i have used for my components . MOC3021 is a isolated TRIAC driver and is easily available in market...I have used a diode in the input to MOC3021 as it was becoming 0 volt always causing my ESP8266 module GPIO to false and that was not working to control...

*** Don't use inductive load with this. That will require the usage of a snubber circuit. The modified schematic will look like below..