Written by Amol Shah, on May-2008

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Remote controls are used everywhere from TV’s to DVD players. You can now control the firing angle of a Triac. This can be used to increase/decrease fan speed or light intensity. The firing is controlled in 0-9 i.e. total 10 steps.

Our device consists of the following section

1.       Microcontroller.

2.       IR Receiver.

3.       Display.

4.       Opto-Triac.

5.       Triac.

6.       Power Supply

Microcontroller

We have used ATMEL’s 20 pin microcontroller AT89C205I. The controller gets the data from the IR receiver & then calculates the firing angle. And accordingly fires the TRIAC at the right time.

IR Receiver

TSOP 1738 is used as IR receiver it is the same one that is used in TV. The receiver receives the data & gives it to the controller.

Display

A Seven Segment display is used to display the current firing angle.

Opto-Triac

Opto Triac is basically used to trigger the Triac. They are used to isolate the microcontroller from the Triac as well as to provide necessary current to the Triac gate.

TRIAC

A TRIAC is like a bidirectional electronic switch which can conduct current in either direction when it is triggered (turned on). It can be triggered by either a positive or a negative voltage being applied to its gate electrode. Once triggered, the device continues to conduct until the current through it drops below a certain threshold value, such as at the end of a half-cycle of alternating current (AC) mains power. In addition, applying a trigger pulse at a controllable point in an AC cycle allows one to control the percentage of current that flows through the TRIAC to the load (so-called phase control).

POWER SUPPLY

The complete circuit (except the TRIAC) works on 5volts. In this section this 5 volts is generated from 230v. Click here for Power Supply Details.

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