sample 12F683_pwm_adc.jal

[hans]

Hello, it's me again

I have tested this sample. The PWM goes from zero to about 25% and again.. manual set of the PWM gives the normal result, so i feel there is something wrong with the ADC reading.

Hans

[hans]

I have now downloaded the adc.jal from the latest discussion ( june 2021), same result.

Op donderdag 1 juli 2021 om 17:40:57 UTC+2 schreef hans:

[hans]

I have solved the problem by changing this part:

var word measure                                -- ADC value / PWM duty cycle

-- ---- mainline ----

forever loop

   measure = adc_read_low_res(ADC_CHANNEL)

   measure = measure *4

         -- get ADC result

   pwm1_set_dutycycle_ratio(measure)

    --pwm1_set_dutycycle_percent(100)

           -- copy to PWM duty cycle

end loop

Op donderdag 1 juli 2021 om 19:23:47 UTC+2 schreef hans:

[vsurducan]

ADC measurement is 8bit wide while your PWM has 10bit.

Measure your potmeter with 10bit resolution and then pass the result to the PWM.

Your solution is ok if resolution loss does not count.

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[hans]

Thanks vasile, I have tested your advice, oke.

Op vrijdag 2 juli 2021 om 07:11:41 UTC+2 schreef vasile: