Hi,
I'm currently working on a project where I want to set my ventilation system automatically. I have different sensors for that. However, I would not like to intervene in the system electronics and therefore have to regulate the system using a pre-installed potentiometer. And so my question is does anyone know how to control a potentiometer with the Arduino? For example with a servo or similar. Does anyone have an idea? The range of the potentiometer is 180°.
Thank you and sorry for my bad english.
Faxyy
A servo could work. Also, I would look into using a stepper motor like the 28BYJ-48. They have on the order of 2048 steps per revolution. Use 5V power and are easy to interface and control using a library like the MobaTools stepper class.
Thank you for your quick reply. That's a very good idea, I hadn't even thought of that.
How easy is to turn the pot manually ?
This will have a bearing on which device you use to turn it under the control of the Arduino
It's not that hard to turn. If you turn it by hand, there is a little resistance, but nothing special.
How does the thing look that wants to be turned? Post an image, please.
I've thought about it again and would like to keep the existing potentiometer as a manual potentiometer. That's why I would buy a second one which I can then control via Arduino. I would then switch between these two manually so that I can decide whether the Arduino should control it or myself. The potentiometer is a 10k ohm and I would buy that one.
Have you measured the signals on each pin of the original pot? Can you design a circuit that will allow both potentiometers to be in the circuit at the same time?
These 2 statements are mutually exclusive
Along with Paul that would be my questions also. Typical 10K 2 watt pot like you pictured normally has about 270 degrees of rotation.
I would be curious as to voltage across the pot and voltage at the wiper across the pot span. Also all voltages to ground. If the existing can be replaced by a digital pot then things can become easier and less a mechanical challenge. Considering the average off the shelf servo motor offers about 180 degrees of rotation. Ventilation system dampers normally use a 90 degree rotation full open to full closed.
Ron
Be sure you can put everything back to original when you have to sell the house!
1 Like
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.