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.
