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Hi. I want to measure and display AC voltage of around 200 - 220 V using an AVR and a 16x2 display. Now I've got the figured out , but I don't know how to sense and measure the voltage. To elaborate , the circuit is an AC voltage controller and I'm using the AVR to supply trigger pulses (PWM) to a triac. Apart from this , I've also got it displaying voltage , current and duty cycle info on the 16x2. Now , I want to display the output voltage to the load on the LCD , since it varies as I vary the duty cycle of the PWM trigger pulse to the triac (I'm using integral cycle control. Thats what the PWM is for.) . How do I go about doing this ? Any help would be appreciated. Thanks !