Multiple signals from SAADC at different intervals

[usmanmehmood55]

Problem:

I am trying to measure two voltages from the SAADC. I have built my application on the ble_app_uart__saadc_timer_driven__scan_mode example. It is using one SAADC channel to measure one voltage. I want to measure two different voltages, but I cannot figure out how. One is a sensor, and the other is battery level. 

Changes in default example:

1. Sampling frequency increased from 4Hz to 1kHz
2. Little bit of post processing and filtering on the SAADC measurements
3. Bluetooth timeout and disconnect responses modified

What changes do I have to make to read multiple signals? Any help with this would be greatly appreciated. 

Thanks in advance

[Karl Ylvisaker]

Hello,

I am trying to measure two voltages from the SAADC. I have built my application on the ble_app_uart__saadc_timer_driven__scan_mode example. It is using one SAADC channel to measure one voltage

I am not sure that I understand what you mean here; the example you are referring to demonstrates the SAADC in scan mode - sampling on 4 different channels ( 4 different inputs ).
Please see the saadc_init function in the example's main file to see how you may set up multiple channels for sampling.
If you connect your sensor to channel_0 (AIN4) and battery to channel_1(AIN5) in the unmodified example, you should get measurements of them both.

I feel like I might have misunderstood your question here, if so, please do not hesitate to let me know!

Best regards,
Karl

[usmanmehmood55]

Hi Karl. Thank you so much for pointing that out, it was I who completely missed the thing 

I had changed my version of that example in the SDK so long ago, now I remember specifically removing the 4 inputs.

Thanks a lot again. 

- Usman

[Karl Ylvisaker]

Hello Usman,

usmanmehmood55 said:

Thank you so much for pointing that out, it was I who completely missed the thing

No problem at all, I am happy to help!

Please do not hesitate to open a new ticket if you should encounter any issues or questions in the future.

Good luck with your development!

Best regards,
Karl