Is this encoder suitable for my project?

[amit88]

Hi

I need to use an encoder in my final year project. I need the encoder to record the movement of a voltage control knob. The knob will be rotated clockwise and anti-clockwise several times during its operation. The range of its movement will be limited between 0 - 70 degrees ( I am trying to achieve a resolution of 0.5 degrees, I understand this encoder will only be able to give upto 64'').

Now, I am planning to use the EAW- Absolute Contacting Encoder (ACE)
(Part no: EAW0J-B24-AE0128L), could you please tell me if this encoder will be able to give me the correct position if I first rotate the knob clockwise and then a few degrees anti-clockwise ? Not sure if the absolute encoder has a sense of direction.

Thanks

Amit

P.S Here is the datasheet for the encoder :View attachment 54569

 

[enjunear]

A simple approach might be to use a single-turn potentiometer, then simply read the voltage on the wiper pin. The range rotation is on the order of 270 degrees, so 0.5 degree increments would correspond to 270/0.5 = 540 points. If you connected a 5K pot (potentiometer) from +5V to ground, you'd have one increment equal 5V/540 steps = 9.26 mV/step. A microcontroller with a 10-bit ADC resolution would get you 5V / (2^10) = 5/1024 = 4.9 mV of resolution. That could be acceptable, depending on your design constraints.

 

[andre_luis]

Yes, is possible detect direction with encoder.
The sequence of values on chanels A and B are different according it direction.

Regarding precision, seems be not enough to perform 0,5 Degrees ( 360 / 256 = 1,4 Degres per pulse )

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