I just wanted to give an update in the event someone comes across the same issue in the future:
I was able to get the KMeterISO to work with the Core.2 unit and using the Arduino IDE by doing the following:
I needed to download the M5Unit-KMeterISO library from GITHUB - https://github.com/m5stack/M5Unit-KMeterISO
I used the included "demo" example that was part of the library download but I had to make a few changes: I added a line "#include <M5Core2.h>" to the beginning. Added "M5.begin();" in void setup(), and finally changed the i2c pins from 21 & 22 to 32 & 33 in the kmeter.begin line - "while (!kmeter.begin(&Wire, KMETER_DEFAULT_ADDR, 32, 33, 100000L)) {"
Here is the complete modified demo example code:
#include "M5UnitKmeterISO.h" #include <M5Core2.h> #define INTERVAL_TIME 500 M5UnitKmeterISO kmeter; uint8_t error_status = 0; long delay_time = 0; long map(long x, long in_min, long in_max, long out_min, long out_max) { return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min; } void setup() { M5.begin(); Serial.begin(115200); while (!kmeter.begin(&Wire, KMETER_DEFAULT_ADDR, 32, 33, 100000L)) { Serial.println("Unit KmeterISO not found"); } delay_time = millis() + INTERVAL_TIME; } void loop() { if (millis() > delay_time) { error_status = kmeter.getReadyStatus(); if (error_status == 0) { Serial.printf("Celsius Temp: %.2fC\r\n", ((float)(kmeter.getCelsiusTempValue())) / 100); Serial.printf("Fahrenheit Temp: %.2fF\r\n", ((float)(kmeter.getFahrenheitTempValue())) / 100); Serial.printf( "Chip Celsius Temp: %.2fC\r\n", ((float)(kmeter.getInternalCelsiusTempValue())) / 100); Serial.printf( "Chip Fahrenheit Temp: %.2fF\r\n", ((float)(kmeter.getInternalFahrenheitTempValue())) / 100); } else { Serial.printf("Error: %d", kmeter.getReadyStatus()); } delay_time = millis() + INTERVAL_TIME; } }