ACS712 i prąd przemienny - Wersja do druku

Kod:

int sensorValue;



void setup()

{

  Serial.begin(9600);  // sets the serial port to 9600

}



void loop()

{

  sensorValue = analogRead(0);       // read analog input pin 0

  Serial.println((511-sensorValue), DEC);  // prints the value read

  delay(100);                        // wait 100ms for next reading

}

Kod:

#define CURRENT_SENSOR A0 // Analog input pin that sensor is attached to



 float amplitude_current;               //amplitude current

 float effective_value;       //effective current 



 void setup() 

 {

   Serial.begin(9600); 

   pins_init();

 }

  void loop() 

 {

   int sensor_max;

   sensor_max = getMaxValue();

   Serial.print("sensor_max = ");

   Serial.println(sensor_max);

   //the VCC on the Grove interface of the sensor is 5v

   amplitude_current=(float)(sensor_max-512)/1024*5/185*1000000;

   effective_value=amplitude_current/1.414;

   //minimum_current=1/1024*5/185*1000000/1.414=18.7(mA)

   //Only for sinusoidal alternating current

   Serial.println("The amplitude of the current is(in mA)");

   Serial.println(amplitude_current,1);//Only one number after the decimal point

   Serial.println("The effective value of the current is(in mA)");

   Serial.println(effective_value,1);

 }

 void pins_init()

 {

   pinMode(CURRENT_SENSOR, INPUT);

 }

 /*Function: Sample for 1000ms and get the maximum value from the S pin*/

 int getMaxValue()

 {

   int sensorValue;             //value read from the sensor

   int sensorMax = 0;

   uint32_t start_time = millis();

   while((millis()-start_time) < 1000)//sample for 1000ms

   {

       sensorValue = analogRead(CURRENT_SENSOR);

       if (sensorValue > sensorMax) 

       {

           /*record the maximum sensor value*/

           sensorMax = sensorValue;

       }

   }

   return sensorMax;

 }