Arduino Project: Zero Crossing Detector based 110/220V ac mains frequency monitoring

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Project Description:
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In Today’s episode you will learn how to make an Arduino based 110/220vac mains frequency monitoring system using a Zero Crossing detector based on the EL817 Optocoupler. This is the 2nd version of the frequency monitoring system. While in the first version of the mains frequency monitoring system I used 2n2222 npn transistor to send the on/off pulses to the arduino and displayed the mains frequency on a 16x2 lcd. As you can see in this circuit there is no isolation between the controller side and the AC voltage side. So if any short circuit happens on this side it will damage the controller side. So that’s why I decided to make an advanced version of the mains frequency monitoring system using EL817 optocoupler. I will be using the same program which I used in version 1. But this time I will only modify the circuit. In this episode we will cover
1. Zero Crossing detector circuit Explanation
2. Interfacing
3. Programming and finally number
4. Testing



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