how to change the ESP-32 ADC sampling rate?

[Matheus_alvez1515]

I have a project, in which I need to acquire a 4096 samples of a 60 Hz frequency signal. Using the analogRead () function, with a maximum of 3 signal cycles, I would like to know how to increase the number of cycles for the 4096 samples of the 60 Hz frequency signal without changing the resolution, changing only the sampling rate.

[ns1668]

So you want to increase the sampling rate of analogRead(), can you post some code so we can see what you are doing currently?

[lbernstone]

arduino-esp32 has an operating system running, which will use some cpu cycles and make any sort of timing technique fail. I would suggest you use a peripheral (pulse counter or rmt) to capture your data without the cpu. If you are trying to do RMS or something where the timing is not as critical as max/min, you can use the I2S to capture data from ADC. https://github.com/espressif/arduino-es ... eq_ADC.ino

[Matheus_alvez1515]

using the function analogSetCycles (255); I achieved a gain in the number of cycles, however, I would like to obtain a greater gain of cycles, however, the function has a maximum parameter of 255, I tried to use the function analogSetSamples (2); however, I got a distortion in the values ​​read, so, I wanted an alternative to increase the number of cycles, I followed the image of the normal result and with the increase of cycles:

image of the normal number of ESP-32 cycles:
https://mega.nz/file/3i5BCKhY#8mcg6UbON ... fQ8vtqqhjc

image with the analogSetCycles () function; implemented:
https://mega.nz/file/f24z3SBA#Qv4JdxhAk ... AN7njYVYcs