Easy Power Meter(กำลังทดลอง) ดูคลิป>> Sketch>> // Sketch to send power consumption data to Xively // Libraries // Define current sensor pin #define CURRENT_SENSOR A0 // Define measurement variables float amplitude_current; float effective_value; float effective_voltage = 220; // Set voltage to 230V (Europe) or 110V (US) float effective_power; float zero_sensor; void setup(void) { // Initialize Serial Serial.begin(9600); // Calibrate sensor with null current zero_sensor = getSensorValue(); Serial.print(Zero point sensor: ); Serial.println(zero_sensor); Serial.println(); } void loop(void) { // Perform power measurement float sensor_value = getSensorValue(); Serial.print(Sensor value: ); Serial.println(sensor_value); // Convert to current amplitude_current=(float)(sensor_value-zero_sensor)/1024*5/185*1000000; effective_value=amplitude_current/1.414; effective_power = abs(effective_value*effective_voltage/1000); // Wait 10 seconds until next update delay(1000); } // Get the reading from the current sensor float getSensorValue() { int sensorValue; float avgSensor = 0; int nb_measurements = 100; for (int i = 0; i < nb_measurements; i++) { sensorValue = analogRead(CURRENT_SENSOR); avgSensor = avgSensor + float(sensorValue); } avgSensor = avgSensor/float(nb_measurements); return avgSensor; }
Posted on: Mon, 22 Sep 2014 15:53:12 +0000
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