Current example

The current sensor device has to be connected to the sensor module. Current sensor device has a 3,5 mm plug what has to be connected to the sensor module left jacket A. The controller and sensor modules must be connected. The current sensor has to be 30A

Needed libraries:

lib_deps = ITTIoT, EmonLib

The example code above shows the alternating current value to current topic “curr”. If nothing is measured the current value is NaN.

#include <Arduino.h>
#include <ittiot.h>
#include "EmonLib.h"
#include <Ticker.h>
#define WIFI_NAME "name"
#define WIFI_PASSWORD "password"
// Pin definition for the current sensor
#define ADC_PIN A0
// create a objects
EnergyMonitor emon1;
Ticker adcTicker;
bool adcFlag;
uint16_t adcSampleCount;
void setAdcFlag()
    // If time, the set adcFlag.
    adcFlag = true;
// Function started after the connection to the server is established.
void iot_connected()
    Serial.println("MQTT connected callback");
    iot.log("IoT current example!");
void setup()
    // setting up serial connection parameter
    //iot.setConfig("wname", WIFI_NAME);
    //iot.setConfig("wpass", WIFI_PASSWORD);
    // print json config to serial
    // Initialize IoT library
    // Current: input pin, calibration (how big current can it read).
    emon1.current(ADC_PIN, 30);
    adcSampleCount = 1500;
    // Start function setAdcFlag 0.5 second interval
    adcTicker.attach(0.5, setAdcFlag);
void loop()
  // IoT behind the plan work, it should be periodically called
  // If adcFlag is set, then send information to server
      adcFlag = false;
      double val = emon1.calcIrms(adcSampleCount);
      String msg = String(val);
      // publishing measured current value to a MQTT broker
      iot.publishMsg("curr", msg.c_str());
      // sending measured current value to a computer
en/iot/examples/current.txt · Last modified: 2021/03/05 01:40 by heiko.pikner
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