230V AC PWM Dimmer Controlled by Arduino, Raspberry Pi

Cheap, easy, galvanic isolated and powerful 230VAC dimmer controlled by PWM output from Arduino, Raspberry Pi etc.

Buy cheap AC dimmer on eBay, which is controllable by manual adjustable resistor. http://www.ebay.com/itm/4000W-AC-220V-SCR-Voltage-...

Connect parallel to manual adjustable resistor photoresistor, place photoresistor to dark box together with LED.

Control LED light by PWM output.

• AC dimmer http://www.ebay.com/itm/4000W-AC-220V-SCR-Voltage-...
• Photoresistor eg VT431N http://www.promelec.ru/pdf/DTS_vt400.pdf
• LED (white)
• resistor (approx 20kOhm)