Yes, actually i plan to measure the coffe machine's current.

Hi guys, i really need a help. Anyone?

Hi, i am trying to measure current and appearance power via SCT-013-050. Used diagram is below.

I used this without a burden because SCT-013-050 has a build in one(am i wrong?). Capacitor is 100uF. Resistors are 22k. Used sketch is below.

#include "EmonLib.h"                   // Include Emon Library
EnergyMonitor emon1;                   // Create an instance

void setup()
{  
  Serial.begin(9600);
  
  emon1.current(A0, 50);             // Current: input pin, calibration.
}

void loop()
{
  double Irms = emon1.calcIrms(1480);  // Calculate Irms only
  
  Serial.print(Irms*230.0);	       // Apparent power
  Serial.print(" ");
  Serial.println(Irms);		       // Irms
}

I am using NodeMCU and sending sensor value to iot hub. Measured sensor value is not stable and depends on power source. If i use a usb sockets on my mac, sensor value transformed in appearance(value*230) is around 80-120(I am measuring current of mac pro) but if i use an charging usb adaptor to power NodeMCU the sensor value is around 500-650.

Tried to disconnect SCT-013-050 from power cable the sensor value is nearly zero on mac's usb power supply. It seems correctly working. Disconnected sensor value via usb adaptor is nearly 500 (appearance power).

I am really stucked. How to solve this problem?