Ac Light Dimmer Using Microcontroller

This project deals with ac electricity which is dangerous if you don t know how to treat it safely.
Ac light dimmer using microcontroller. Description of the microcontroller controlled light dimmer a light source 10 which may be for example an incandescent light source drawing between 40 and 2 000 watts of power is connected to a source of ac power 12 through. Microcontroller is actually the main intelligent controller of this device which is interfaced with zero crossing detector optocoupler 1 optocoupler 2 and lcd display. Basically it consists of an led that emits infrared light and the photosensor which detects it. So you can reach to the required voltage by triggering the triac after a specific delay do you recommend this.
Capacitive and inductive loads require some slight modifications the addition of snubber components which won t be covered here but information is available online and in the component datasheets. The compact ac light dimmer module with zero crossing detector described here is ideal for microcontroller based ac voltage controlling applications and projects. For this design we will be designing an ac dimmer for incandescent lamps with the following features. With help of digital buttons you can control the brightness from 0 to 9.
This module contains a triac triggering coupled with zero crossing. Note that this is an ad hoc device in that it is designed to controlling resistive loads only like most toaster ovens. We previously used the same moc3021 optocoupler in triac dimmer circuit. When the ac voltage crosses the zero the microcontroller will be interrupted an therefore detects the zero crossing.
Here we are used a moc3021 optocoupler to control the ac lamp from microcontroller signals which is a dc signal. Plus we know that we can control a. For more details visit www 8051projects info. I go into the comparison between a regular ac and then ac signal post triac dimmer in the next section.
This ac dimmer of two loads using single controller works on the principle of triggering pulse which is generated by the microcontroller. Capable of delivering 100 200 watts of. We re only going to be making the ac waveform dimmer here. Control the brightness of the light using 8051 microcontroller.