Hello Vasile, Sorry but only today had a chance to check here. Yes, not easy to smooth that signal but managed to do it good enough using median values and then filtering the readings if they change more than some threshold... I can publish that code, here, if needed. And yes, reading values inside VCC/GND amplitude. Thank you for the input.
Cheers, FS. On Thursday, September 1, 2022 at 3:53:54 AM UTC+1 vasile wrote: > I do not think you can do a proper average on a +3V +/-1V whichever > "software tricks" you'll do. > Which amplitude do you want to measure on that signal, V+, V-, Vpp? > Perhaps an oscilloscope capture would help for a better answer. > > On Wed, Aug 31, 2022 at 7:32 PM flyway38 <[email protected]> wrote: > >> Hi Vasile, >> >> Yes understand your point and thank you for your input. >> But, my problem is cannot change the hardware design. Maybe in near >> future... >> Also, it's not AC signal what I need to smooth. Its a positive >> oscillating signal, like 3V, +/-1V. >> Thanks anyways. >> >> Cheers, >> Filipe Santos. >> >> On Wednesday, August 31, 2022 at 4:26:29 PM UTC+1 vasile wrote: >> >>> :) "precision rectifier" or "zero voltage drop rectifier" not "zero >>> precision rectifier" :P >>> >>> On Wed, Aug 31, 2022 at 6:22 PM vsurducan <[email protected]> wrote: >>> >>>> Felipe, in my opinion you have two variants: >>>> 1. the easiest one: use a zero precision rectifier with operational >>>> amplifiers, there are several versions, then your problem will be >>>> measuring >>>> a DC signal. Beware of using adequate bandwidth OA and use precise >>>> resistors for positive and negative slopes ( if your signal is >>>> alternately). >>>> >>>> >>>> https://www.google.com/search?q=precision+rectifier&tbm=isch&ved=2ahUKEwiHoc6_r_H5AhUThxoKHbi-Au4Q2-cCegQIABAA&oq=precision+rectifier&gs_lcp=CgNpbWcQAzIFCAAQgAQyBQgAEIAEMgUIABCABDIFCAAQgAQyBQgAEIAEMgUIABCABDIGCAAQHhAHMgYIABAeEAcyBggAEB4QBzIGCAAQHhAHUOCWAliipAJgo6oCaABwAHgAgAGaAYgBlwuSAQQwLjEymAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=FnsPY4e-PJOOarj9ivAO&bih=815&biw=1537&client=firefox-b-d >>>> >>>> 2. the complicated one which will not work with jal library: sense the >>>> zero cross of the signal (if there is any), add a precise delay until >>>> you'll sample the top of the rectangular signal or the Vmax of the >>>> sinusoidal shape and sample it. You'll have to process data later. You can >>>> not sample, format and display in a loop since the time consumed by last >>>> two is much longer than the signal period. >>>> >>>> best wishes >>>> >>>> >>>> On Wed, Aug 31, 2022 at 3:13 PM flyway38 <[email protected]> wrote: >>>> >>>>> Hey Guys, >>>>> >>>>> My bad. Sorry to make this mistaken post. >>>>> *10bit ADC is working fine.* >>>>> Problem is my code. Am trying to smooth the sinal that is read by the >>>>> ADC. >>>>> Its a fast (100KHz) oscillating signal (with vpp around 1V) that am >>>>> trying to read it like DC... Not easy I know. >>>>> My code is currently reading some hundreds times the signal, then >>>>> finds the median of all readings and then discard the final reading (make >>>>> it equal to last median value) if it changes by a small divergence (like >>>>> 2 >>>>> bits) from last median value. >>>>> This is what lead me to think (wrongly) that ADC was converting at >>>>> 8bit. >>>>> Sorry again for posting a wrong question. >>>>> >>>>> But now this raises new question; >>>>> How to smooth an oscillating signal and make it DC reading just like a >>>>> DC-Voltmeter would do? >>>>> (Using only code... cannot change my design) >>>>> Thank you once again. >>>>> >>>>> Best regards, >>>>> Filipe Santos. >>>>> >>>>> >>>>> On Wednesday, August 31, 2022 at 9:26:23 AM UTC+1 Rob Hamerling wrote: >>>>> >>>>>> >>>>>> >>>>>> On 31/08/2022 10.21, Rob Hamerling wrote: >>>>>> >>>>>> adc_read_high_res() returns a word, but your AdcChnn is a byte... >>>>>> >>>>>> Sorry, that 'AdcChnn' is a byte isn't the relevant here. Maybe >>>>>> AdcData is a byte, but I cannot find that in the code you showed. >>>>>> >>>>>> >>>>>> -- >>>>>> *Rob H*amerling, Vianen, NL >>>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "jallib" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/jallib/68dfd26e-07d1-4ba5-bf02-f41aee02c29bn%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/jallib/68dfd26e-07d1-4ba5-bf02-f41aee02c29bn%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/d81e0cf6-5487-4186-a961-01fbd5ba6ec4n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/jallib/d81e0cf6-5487-4186-a961-01fbd5ba6ec4n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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