Hey,
For a project I need to stir a viscous fluid thats being heated so that nothing sticks to the wall of the kettle and the temperature is distributed as evenly as possible while being cheap. I thought of getting my hands on a second hand drill and just put a fan on the and of an axle and use a circuit to regulate the rpm of the motor. I found the way to do this is to use TRIAC and a DIAC but I am not quite certain of how I should use them exactly or what possible problems I could encounter. At first I would like like to be able to do it with just a potentiometer but later on I would like to be able to use my arduino regulate the speed. How should I begin?
(It's not pressing, I'm just doing this in my spare time this vacation)
Much appreciated
The circuit using a DIAC to phase control a load is for use with a variable resistor which is manually controlled.
If you want to implement control by a servo system, you need to synchronise to the AC cycle and implement your phase control with the microprocessor relative to this. This requires opto-isolators in both directions, from mains to microprocessor and from microprocessor to Triac. It also presupposes that you have complete competence in working with mains powered equipment.
It certainly may be easier to use a low voltage DC motor,