Table 2.

ThingSpeak^TM update executed by the presented prototype.

/* … */

byte server[[] = {184, 106, 153, 149};  // IP Address (or api.thingspeak.com) for the ThingSpeak (https://thingspeak.com/)

String writeAPIKey = “E18Q*X*TY**8A*4U”; // Write API Key for a ThingSpeak Channel

…

…

updateThingSpeak(“field1=” + String(RMSPower) + “&field2=” + String(peakPower));

…

…

void updateThingSpeak(String tsData) { // RMSPower, peakPower, …, more 1

if (client.connect(server, 80)) {

Serial.println(F(“Connected to ThingSpeak...”));

client.print(“POST /update HTTP/1.1\n”);

client.print(“Host: api.thingspeak.com\n”);

client.print(“Connection: close\n”);

client.print(“X-THINGSPEAKAPIKEY: “+writeAPIKey+”\n”);

client.print(“Content-Type: application/x-www-form-urlencoded\n”);

client.print(“Content-Length: ”);

client.print(tsData.length());

client.print(“\n\n”);

client.print(tsData);

}

…

}

…

¹ The current readings are calibrated by scaling factors [59] for power computation.