Timeline for How to set the sampling frequency in Arduino without using a delay
Current License: CC BY-SA 3.0
7 events
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| May 17, 2018 at 12:23 | comment | added | Ahmed K. Moustafa | @dandavis can you please specify the units of the baud rate and the reading period. it is (bps / us = hz) ?? Thanks | |
| Mar 22, 2018 at 19:50 | comment | added | dandavis |
(1000000 / 4000) == 250 If 2000 works your timing is off.
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| Mar 22, 2018 at 19:14 | comment | added | Ahmed K. Moustafa | Thanks for your answer. I have tried the code, however, it gave sampling frequency 125 Hz. I tried playing with the READ_PERIOD and I found that 2000 gave sampling frequency of 250 Hz. What does this number stand for and what concept or equation is being used ? Many thanks !! | |
| Mar 22, 2018 at 19:12 | vote | accept | Ahmed K. Moustafa | ||
| Mar 21, 2018 at 22:12 | comment | added | Edgar Bonet |
I took the liberty to do a few edits: use micros() instead of millis(), as the latter has 1 ms of jitter; write lastRead += READ_PERIOD instead of lastRead = now to prevent creeping drift; a few simplifications.
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| Mar 21, 2018 at 22:12 | history | edited | Edgar Bonet | CC BY-SA 3.0 |
`micros()` instead of `millis()`, avoid drift, simplifications.
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| Mar 21, 2018 at 20:32 | history | answered | ratchet freak | CC BY-SA 3.0 |