problem in analog read.........?

RE: problem in analog read.........?

ThomasWe — Wed, 20 Sep 2017 10:33:03 GMT

I use Mbed. I found the solution to my problem here: devzone.nordicsemi.com/.../ It works now. Thank you

RE: problem in analog read.........?

iqbalpalemad — Wed, 20 Sep 2017 04:50:50 GMT

@ThomasWe

which platform are you using to program........?

RE: problem in analog read.........?

ThomasWe — Tue, 19 Sep 2017 17:15:58 GMT

Hello, I have a similar problem, When I remove the UART I get 0 from my analog read and when I declare it I get the right value... have you been able to solve it?

RE: problem in analog read.........?

iqbalpalemad — Fri, 31 Mar 2017 05:23:57 GMT

i will sent it to you by personal message.........

RE: problem in analog read.........?

Jørgen Holmefjord — Thu, 30 Mar 2017 10:23:34 GMT

This sounds very strange. Would it be possible for you to share your mbed project? It would make it easier to debug the issue.

RE: problem in analog read.........?

iqbalpalemad — Wed, 29 Mar 2017 07:45:30 GMT

hai i have tried with a delay but there is no change in result.

void periodicCallback(void)
 {
  service_data[4] = calculate_percentage(analog_pin_1.read_u16());
  service_data[5] = calculate_percentage(analog_pin_2.read_u16());
  //printf(" percentage_1 : %d and perncentage_2 : %d \n\r",service_data[4],service_data[5]);
  wait(.01);
  update_service_data();
}

and i have noticed that if the printf statement is commented then mcu miss reads the value.

that is i have declared one more anlog pin

 AnalogIn   dummy(p1);
 AnalogIn   analog_pin_1(p5);
 AnalogIn   analog_pin_2(p6);

now if i read the adc values without printf that is in servicedata

the value shown at dummy pin is the value at p5. the value in both p5 & p6 are same always and is the value at p6. there is no change in any value if i change the voltage at p1.

RE: problem in analog read.........?

Jørgen Holmefjord — Tue, 28 Mar 2017 11:37:47 GMT

Could you try adding a short delay before updating the service data?