rotary incremental encoder using LabVIEW

[Ali_25]

Hello!

I'm trying to read pulses from the rotary encoder by using this code but it is showing random garbage values. how can I read values from the encoder by using phases A and B?

Is this necessary to have encoder vi to reading the values from it?

If yes, kindly provide it if you have any. Thanks!

[AeroSoul]

What you posted seems to be a code to read a potentiometer, not an encoder with AB(Z?) signals, so that might be your problem.

EDIT:

The code you posted is titled "ANALOG pin read example" and uses what seems to be potentiometer hooked up to +5V, GND and a signal line, which is the analog voltage you are (supposed to be) trying to read.

encoder with AB signals would most likely be digital and and would have 2 signal lines (3 if it includes the Z signal) and power lines.

Reading that kind of encoder with a single line analog read would equally result in reading garbage data.

[Ali_25]

Thank you for your info!

Actually, I am trying to use a rotary incremental encoder using LabVIEW & Arduino. can you kindly guide me on how can I control the encoder?

[Farmalawi]

You have to use the interrupt pins which they are pin 2 and 3 in Arduino uno. You can use the attached example.

GOOD LUCK

[Ali_25]

Hello!

Thank you for the code.

I did all the things mentioned in the file. I uploaded LIFA on the Arduino compiler. I used pins 2 & 3. During running code on LabVIEW, the encoder was not showing any result on LabVIEW. the count is not increasing or decreasing when I change the position of the encoder. 

Kindly tell me how can I resolve this issue. Thank you

[Ali_25]

Hello!

I'm trying to read values from the encoder using this code

I used pins 2 & 3. During running code on LabVIEW, the encoder was not showing any result on LabVIEW. the count is not increasing or decreasing when I rotate the knob of the encoder. 

Kindly tell me how can I resolve this issue. Thank you

[RavensFan]

Why aren't you using LINX?  LIFA is obsolete and was replaced by LINX.

[Ali_25]

Hi!

can you guide me on how I this LIFA based code into LINX? because it is very difficult to find an encoder block in LINX. Thanks

[deceased]

If the encoder pulses are coming quickly then an arduino alone using interrupts on A and B wont keep.

From my experience, you will need to find a suitable quadrature counter chip and interface to it from the arduino using something like SPI or I2C, to periodically poll for the latest count.

Some chips I have seen have the ability to trigger an interrupt line when a certain count is reached. What is the best approach will depend on the application.

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