[Solved] Arduino opto-triac dimmer control

Hi

I have this diac triac lamp dimmer circuit I want to control with an arduino. I replaced it's potentiometer with 2 fixed value 1/2 watt resistors (330K and 130K) so that I always get only 2 predefined set of brightness levels for the lamp. Arduino will control the 2 opto-triacs with the help of 2 2N222A transistors.

Below is a circuit diagram with MOC3020.

The problem is I have trouble deciding what type of opto-triac should I use. There is MOC3020 non zero crossing model and then there is MOC3083 with zero crossing. Which one should I go for?

The load will be 12W led lamp driven using a dimmable CC driver.

Go with MOC3020 :slight_smile:

The opto-isolator in that circuit is a 4N35 right? isn't that used for DC ?

Noobian:
The opto-isolator in that circuit is a 4N35 right? isn't that used for DC ?

Yes it is, because that dimmer is using MOSFET control with DC supply.
Must be wrong link.

A MOC3020 should be fine.

Tom... :slight_smile:

anbu123:
Go with MOC3020

TomGeorge:
A MOC3020 should be fine.

Ok, thanks for the suggestion. I'm ordering MOC3020 right away. Problem solved. +Karma for both of ya. :slight_smile: