LAUNCHXL-F28027: Noise in ADC reading (Simulink)

Muhammad Najwan Hamidi

Part Number: LAUNCHXL-F28027

Hello, I'm using the C2000 support package for Matlab with my F28027F launchpad. Now I'm testing a current sensor (LA25-np). I used the ADC block to read the analog value from the sensor. All settings of the ADC block are left intact. Unfortunately, there is a lot of noise in the reading I got. Attached image below is the scope reading directly taken from the ADC block. Is there any setting that I'm not aware of regarding this issue?

Then, I tried to read the output from the same sensor using my Arduino Uno with Arduino support package for simulink just to double check. The reading is good as can be seen below.

over 5 years ago

0 Marlyn Rosales Castaneda20 over 5 years ago

TI__Mastermind 23330 points

Hello Muhammad.

A Simulink expert has been notified of your post, and will reply back to you as soon as they can.

Best Regards,

Marlyn

0 venkatesh chilapur over 5 years ago in reply to Marlyn Rosales Castaneda20

Mastermind 6460 points

Hi,

This post might be of help to you.

LAUNCHXL-F28027: Noise in the ADC reading. - C2000 microcontrollers forum - C2000™︎ microcontrollers...

e2e.ti.com

Part Number: LAUNCHXL-F28027 Other Parts Discussed in Thread: AMC1200 I configured the ADC using c2000 embedded coder support package and connected the A0 pin

0 Muhammad Najwan Hamidi over 5 years ago in reply to venkatesh chilapur

Prodigy 30 points

Unfortunately, the problem still exists. I've also tried reading the same sensor using the F28335 controlCARD+docking station. The ADC reading is very good.

My ADC reading from F28027F launchpad:

My ADC reading using Arduino UNO:

0 venkatesh chilapur over 5 years ago in reply to Muhammad Najwan Hamidi

Mastermind 6460 points

Hi,

Try to see if you configure a TI shipping example to get this job done from CCS.

See if that part works or does that also result in same behavior.

Furnish the details so that TI friends can provide inputs as well.

0 Muhammad Najwan Hamidi over 5 years ago in reply to venkatesh chilapur

Prodigy 30 points

I just tried reading the ADC from CCS. The problem does not occur in CCS. The readings a fine with less than 5% deviation from the max and min value. Only in Simulink I encounter the problem.

0 venkatesh chilapur over 5 years ago in reply to Muhammad Najwan Hamidi

Mastermind 6460 points

Hi,

OK, we then need to investigate the code. Can you do me a favor, please can you attach the files from CCS and model from Simulink.?

0 MatthewPate over 5 years ago in reply to venkatesh chilapur

TI__Guru* 77410 points

Muhammad,

Have you had an opportunity to locate the files that Venkatesh has requested? Those will be needed to continue the debug.

Best,
Matthew

0 Marlyn Rosales Castaneda20 over 5 years ago in reply to MatthewPate

TI__Mastermind 23330 points

Muhammad,

I am assuming you resolved your issue. If you did not, feel free to reply to this thread. If it locks then "Ask a Related Question", or create a new thread referencing this one for further assistance.

Best Regards,

Marlyn