FEMS

fems.ino

#define CAYENNE_PRINT Serial  // Comment this out to disable prints and save space
#include <CayenneMQTTEthernet.h>

// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
char username[] = "Paste your username";
char password[] = "Paste your password";
char clientID[] = "Paste your clientID";

// 電圧
#define VOLT 100
//ms サンプリング間隔
#define SAMPLE_PERIOD 1
// サンプリング数
#define SAMPLE_SIZE 1000
// 読み取るピン
#define INPUT_CH 0
// 基準電圧のピン
#define BASE_CH 1

// Virtual Pin of the Digital Motion Sensor widget.
#define VIRTUAL_CHANNEL 22

void setup() {
  Serial.begin(9600);
  Cayenne.begin(username, password, clientID);
}

void loop() {
  Cayenne.loop();
  float w = powerRead();
  Serial.println(w);
  Cayenne.virtualWrite(VIRTUAL_CHANNEL, w, "analog_sensor", "null");
}


// 消費電力を読み取る
float powerRead() {
  float sam = 0;
  for (int i = 0; i < SAMPLE_SIZE; i++) {
    delay(SAMPLE_PERIOD);
    float diff = abs(analogRead(INPUT_CH) - analogRead(BASE_CH));
    float voltage = diff * 5 / 1023;
    sam += voltage;
  }
  // 平均電圧
  float average = sam / SAMPLE_SIZE;
  // 測定電流(変流比3000,30Aに対して10Ω負荷抵抗時に0.1V出力 0.1 * (3000 / 10) = 30A )
  // https://akizukidenshi.com/catalog/g/gP-08960/
  // 抵抗値を200Ωに変更
  float a = average * (3000 / 200);
  // 電力
  double w = a * VOLT;
  return w;
}