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- #include <Filters.h> //Easy library to do the calculations
- #include <LiquidCrystal_I2C.h>
- LiquidCrystal_I2C lcd(0x27, 16, 2);
- float testFrequency = 50; // test signal frequency (Hz)
- int Sensor = 0; //Sensor analog input, here it's A0
- int relay = 9; //Define output pin for relay
- float intercept = 0.7; // To be adjusted based on calibration testing
- float slope = 0.04; // To be adjusted based on calibration testing
- float current_Volts; // Voltage
- unsigned long printPeriod = 1000; //Refresh rate
- unsigned long previousMillis = 0;
- void setup()
- {
- lcd.init();
- lcd.backlight();
- pinMode(relay, OUTPUT);
- lcd.print("Voltage:");
- delay(1000);
- }
- void loop()
- {
- RunningStatistics inputStats; // Easy life lines, actual calculation of the RMS requires a load of coding
- while ( true )
- {
- Sensor = analogRead(A0); // Read the analog in value:
- inputStats.input(Sensor); // Log to stats function
- if ((unsigned long)(millis() - previousMillis) >= printPeriod)
- {
- previousMillis = millis(); // Update time every second
- current_Volts = intercept + slope * inputStats.sigma(); // Calibartions for offset and amplitude
- current_Volts = current_Volts * (40.3231); // Further calibrations for the amplitude
- lcd.setCursor(9, 0);
- lcd.print(current_Volts);
- lcd.print("V");
- }
- // Case 1 Under Voltage
- if ( (current_Volts > 0) && (current_Volts < 150) )
- {
- lcd.setCursor(0, 1);
- lcd.print("Under Voltage");
- digitalWrite(relay, LOW);
- }
- // Case 2 Normal Rated Voltage
- if ( (current_Volts >= 150) && (current_Volts <= 180) )
- {
- lcd.setCursor(0, 1);
- lcd.print("Normal Voltage");
- digitalWrite(relay, HIGH);
- }
- // Case 3 Over Voltage
- if ( current_Volts > 180 )
- {
- lcd.setCursor(0, 1);
- lcd.print("Over Voltage");
- digitalWrite(relay, LOW);
- }
- }
- }
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