RobTillaart
commented
1 year ago Hard to say as there are many factors
A quick and dirty calculation:
clock speed the INA219 can handle 2.5 MHz in theory (never tested) As the INA219 can do 2.5 MHz that implies max 2.500.000 / 8 bytes = 300.000 bytes per second as the current is a float of 4 bytes there are max 300.000 / 4 = 75000 floats per second.
We did not count any overhead or further processing so lets say that is a factor 3 that would leave 25000 measurements per second max.
That is a factor 40 from your 1 MHz samples.
Think the INA219 is not the sensor that can do this.
My need is to detect very small peaks in power consumption measurement.
Questions:
- what are the durations of such peaks?
- what is the normal load? AC/DC?
- what is the peak load?
- how often do you have the peaks? Poison distribution, random, uniform?
These questions should better be discussed on the Arduino forum or so. I think you must create a hardware solution that triggers and hold when a peak occurs. (interrupt). And that can be reset from the MCU Guess you should look for a comparator (convert the current peak to a voltage peak)
- some interrupt handling
N0ury
Hi Rob this is just a question. What would be the highest frequency on an ESP32-S2 with PSRAM for a loop with:
Eventually same question with an ESP32-S3 but with a Serial.println (no PSRAM), or a picow (RP2040).