I want to design a string potentiometer using a UNO and a quadrature rotary encoder 1024 P/R.
My calculations are as follows:
arc length=0.1mm (resolution)
angle=1024/360=0.3515625 degree
radius of pulley attached to shaft of encoder =1.629747cm
Is this a correct approach ?
Can i achive the resolution with the Uno and encoder?
I'm not gonna check your math, but yeah, you can totally do this. If you know the limits, you can probably save a bit of programming by using a 10 turn pot.
I should use a 10turn pot instead of the rotary encoder? Limits for what?
ihetaf:
I should use a 10turn pot instead of the rotary encoder? Limits for what?
Limits for your movement and other parameters. How about you describe your device with more detail, and an overview? What is moving, how much, what speed, what size, functional diagrams, schematics, parts list, construction files? Pictures? Video of the device in action?
I mean, show me what you got!
Hi,
Your major hurdle will be getting the wire to wind on the drum in a side by side method, any time the wires cross over each other you will produce an offset error.
Working your answer backwards, using widows calculator
r= 1.629747 cm
Circ = 2 * r * Pi = 10.240002 cm = 102.40002 mm
Dist per count = 102.40002 / 1024 = 0.10000002348457040548837456378847mm
Should be about right..
But that is the surface of the drum, what is the gauge of the wire?
Tom...
I want to measure speed and displacement of the pointer on scale(max length 5m) shown in picture. I want to build something like this(Cheap String Potentiometer Pt 1 - YouTube) with a display using the uno. I don't know the speed at which it will move as I have to measure it during the process.