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how can i control a 220VAC appliances using microcontroller?

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eng_ahmed22

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220v ac and microcontroller

hi all

i need to control a 220 VAC appliances using miacro controller, the ATMEL (AT89c5x).
i cannot use a relay becouse the i need to on/off the devise at high speed.
i know that i can use thyrestor or triac, but how???

thanks alot

Ahmed
 

relay microcontroller 220v ac

Use optocoupler of MOC series; for best results try to select one with zero-crossing circuit ..
For example see picture below ..
Regards,
IanP
 

220v ac appliances

Salam Ahmed,

the best thing is to use a solid state relay
may be if u say more details i could help

salam
 

activating optocoupler using a microcontroller

Salam!
Use MOC3041 optocoupler for this purpose. Download its datasheet and thats all you need.
Regards.
 

Re: how can i control a 220VAC appliances using microcontrol

Hi,
The optocoupler is OK, solid state relay too, but you must think and for something other. Depending from your load, you will have a interferences, and i can say big interferences. The better choice is using solidtstate relay with zero cross control, in this case you will have the smallest interferences. If the load is more that 3-5 kW then you can will have a big problem.
The AT89x is not a very stable if have a strong interference, you must very careffuly make aPCB design, power, reset, and output, because your procesora will be unstable.
 

Re: how can i control a 220VAC appliances using microcontrol

An Optocoupler can be also used to separate the output signals. If optocoupler LED is connected to microcontroller pin, logical zero on pin will activate optocoupler LED, thus activating the transistor. This will consequently switch on LED in the part of device working on 12V. Layout of this connection is shown in att.


The program for this example is simple. By delivering a logical one to the pin of port , the transistor will be activated in the optocoupler, switching on the LED in the part of device working on 12V.
 

Re: how can i control a 220VAC appliances using microcontrol

or u could try this!
 

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