![]() Then in the next half-cycle, it flows in alternate direction (negative) to a peak voltage and then again comes to zero. In the first half of every cycle, it flows in one direction reaching a peak voltage and then decreases down to zero. This AC signal is alternating in nature and changes its polarity periodically. ![]() The AC supply we get in our household is 220v AC RMS, 50 HZ. Potentiometer to control the Fan speed amountĤ. The working can be divided into four different parts. In previous tutorial, we controlled the DC fan speed using PWM. Here phase controlling method of the AC signal is used to control the AC fan speed, using PWM signals generated by Arduino. In this project, we will demonstrate Arduino AC fan speed control using TRIAC. In this case, the PWM technique is used, so here we will learn how to use Arduino generated PWM to control AC fan speed with Arduino. ![]() But there are a lot of applications where we need to control the AC power partially, for example, to control the speed of the Fan or the intensity of a Lamp. It is easy to turn on or off any home appliance by using a switch or by using some control mechanism as we did in many Arduino based Home Automation projects. Do not touch any of the components or wires when the circuit is in operation. ![]() Be advised that working with 220V AC mains voltage requires extreme precaution and safety procedures should be followed. WARNING!! The circuit diagram discussed in this project is only for educational purposes.
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