Hi guys am designing a brightness control system using adruino board with atmega328 to light up 4 led lights each is 110 vac for indoor room, the problem that am facing difficulty figuring out what to use from the pwm output pin of the adruino chip to generate high current to power up the LED light which are 110 vac for my project

all help is appreciated
thanks

 

Don't think you are going to get 110VAC from your arduino.

 

If you are using complete LED lamps that operate directly from AC, your best bet is to use a transformer to sense the phase of the AC line, then based on that timing, fire a triac at the proper phase. To do you, your LED lamps must be rated for dimmer operation (some don't work well on dimmers).

If you are using bare LEDs, you can find LED driver chips from companies like Power Integrations, Texas Instruments, and International Rectifier (to name but a few) that have dimmer inputs -usually analog. You can drive the dimming input by low pass filtering and buffering the output of your PWM.

 

Thank you DickCappels for the clear detailed answer

 

Couldn't you just use a solid state relay and PWM controller to turn on/off the LED's with the arduino?

 

It seems unlikely that a solid state relay would be fast enough to able to respond PWM from an AVR (Adurino). We're taking many tens of kHz or faster.