[BUG] ADS1115 measuring SCT013 not properly

[AlexanderTonn]

:bug: Describe the bug

• the current which is calculated is not fitting to the measured current of my multimeter (see pictures)

 :bangbang: To Reproduce**

Steps to reproduce the behavior:

• all gain settings of ADS1115 tested (with the hope that the gain is not high enough)

:interrobang: Expected behavior

• the current must be fit nearly to the current of the multimeter

:camera: Screenshots

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Additional context

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[AlexanderTonn]

The solution was to set up the highest data Rate of ADS1115. In the documentation of powerUC the author is also describing that a higher sample rate is necessary

void setup() {
// ... 
ads1.setGain(GAIN_TWO);
ads2.setGain(GAIN_TWO);
ads1.setDataRate(RATE_ADS1115_860SPS);
ads2.setDataRate(RATE_ADS1115_860SPS);
// ...
}

Quote of official Doc of powerUC:

If you use a component with SCT013 with ±1V RMS output and ADS1115, the required code is similar to the code we see in >the input to the ADS1115. You need to consult the Adafruit library for ADS1115.

In order to sample the ADS1115 at a higher speed, we need to modify the file, ‘Adafruit_ADS1015.h’.

With this modification, we will be able to reduce the sampling time from about 8-9 milliseconds (about 100 hertz) to about >1.8 milliseconds (about 500 hertz). As we leave the Nyquist frequency, we improve the measurement behavior.