Some code that you may want to change to make it work (I have ESP32):
In EmonLib.h:
#if defined(__arm__)
#define ADC_BITS 12
#else
#define ADC_BITS 10
#endif
Just add/replace with:
#define ADC_BITS 12
Because ESP32 is a 12-bit ADC.
In EmonLib.cpp
Replace all occurences of "/1024" by "/(ADC_COUNTS>>1".
The code was originally written for a 10-bit ADC, without ability to change it to 12 bits.
That's all. The precision and predictability of the reading is improved a lot.
Another note, for Calibration (111.1 value). If you have a voltage-output sensor (SCT-013-015, SCT-013-020, etc.), replace the "111.1" with "15" for -015, "20" for -020, etc. In other words, use the same calibration value as the Amp/V value (15A/V use "15", 30A/V use "30"). Most of the examples I saw online, using the 111.1 calibration value, are only good for SCT-013-000 with current output (which also require a burden/load resistor). Since the non-000 (-015, -020, -050, etc.) sensors have the burden/load resistors integrated, the calibration constant is different.
I hope it helps someone. Took me a few days to figure it out.
Alex
Some code that you may want to change to make it work (I have ESP32):
In EmonLib.h:
Just add/replace with:
#define ADC_BITS 12Because ESP32 is a 12-bit ADC.
In EmonLib.cpp
Replace all occurences of "/1024" by "/(ADC_COUNTS>>1".
The code was originally written for a 10-bit ADC, without ability to change it to 12 bits.
That's all. The precision and predictability of the reading is improved a lot.
Another note, for Calibration (111.1 value). If you have a voltage-output sensor (SCT-013-015, SCT-013-020, etc.), replace the "111.1" with "15" for -015, "20" for -020, etc. In other words, use the same calibration value as the Amp/V value (15A/V use "15", 30A/V use "30"). Most of the examples I saw online, using the 111.1 calibration value, are only good for SCT-013-000 with current output (which also require a burden/load resistor). Since the non-000 (-015, -020, -050, etc.) sensors have the burden/load resistors integrated, the calibration constant is different.
I hope it helps someone. Took me a few days to figure it out.
Alex