Master-Slave switch.ino

#include <Filters.h>
#include <RunningStatistics.h>

float testFrequency = 60;                     // test signal frequency (Hz)
float windowLength = 20.0/testFrequency;     // how long to average the signal, for statistist
int sensorValue = 0;
float intercept = -0.1129; // to be adjusted based on calibration testing
float slope = 0.0405; // to be adjusted based on calibration testing
float current_amps; // estimated actual current in amps
const int relayPin = 2;          // Digital pin for relay module
bool relayState = false; // Keeps track of relay state

unsigned long printPeriod = 1000; // in milliseconds
// Track time in milliseconds since last reading 
unsigned long previousMillis = 0;

void setup() {
  Serial.begin( 57600 );    // start the serial port
    // Initialize the relay pin as an output
  pinMode(relayPin, OUTPUT);
}

void loop() {
  RunningStatistics inputStats;                 // create statistics to look at the raw test signal
  inputStats.setWindowSecs( windowLength );
   
  while( true ) {   
    sensorValue = analogRead(A0);  // read the analog in value:
    inputStats.input(sensorValue);  // log to Stats function
        
    if((unsigned long)(millis() - previousMillis) >= printPeriod) {
      previousMillis = millis();   // update time
      
      // display current values to the screen
      Serial.print( "\n" );
      // output sigma or variation values associated with the inputValue itsel
      Serial.print( "\tsigma: " ); Serial.print( inputStats.sigma() );
      // convert signal sigma value to current in amps
      current_amps = intercept + slope * inputStats.sigma();
      Serial.print( "\tamps: " ); Serial.print( current_amps );
    }
      // Check if current exceeds 0.1A (100mA)
  if (current_amps > 0.1) {
      digitalWrite(relayPin, HIGH);
      relayState = true;
    }
  else {
      digitalWrite(relayPin, LOW);
      relayState = false;
    }
  }
}