Measuring RPM for encoder 11 bits

[fendy90]

Here is the result if im using baudrate up to 115200,  You may see the substring format are not according to the format that i set in "scan for string". This error will always pop-out everytime i try to run VI.

Thanks

[Bob_Schor]

You clearly have a meaningful string at 115000 Baud, you just are having problems with Scan from String.  The silly \s "spaces" are the problem.  Try this --

Bob Schor

[crossrulz]

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@Bob_Schor wrote:

You clearly have a meaningful string at 115000 Baud, you just are having problems with Scan from String.  The silly \s "spaces" are the problem.

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The indicator was already using the \ Codes.  So you don't need to convert the spaces into "\s".  You just need to use actual spaces in the Scan From String.

[crossrulz]

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fendy90 wrote:

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Argument 3 is throwing the error.  The last VI you posted had 5 items in your Scan From String.  Your read data only has 3.  So you should change your format string to be "%f %f %f".  No need to mention the end of line characters since that is what is causing your error (the function is looking for a space to end the third item and found a carriage return).

[fendy90]

Hi,

it is like my data input in substring is intermittent as it read data from the sensor. That's why it throws error in "scan from string". If i used a slower baudrate up to 14400. It seems like the data input stabile and no error for formating 

[fendy90]

When i force to continue the error, this is what i get from all the input data in substring. It seems like the input data is not stabile.

[ToddK]

From your posted example, your encoder values are counting down at a 125ms sample rate. Using my previous posted VI, “Encoder_Accelerometer_Final_Sync_V2_A.vi”, change the logic to check for counting down encoder values and the RPM calculations will work.

If Previous Encoder rolled over or hasn’t changed

Then Delta Enc =(2048-Encoder1)+Previous Encoder

Else Delta Enc = (Previous Encoder – Encoder1)