SCT-013-030 Energy Meter
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Sorry for nuub question but can you use a pro mini 3.3 för this?
Or do i need a nano or pro mini 5v? -
Sorry for nuub question but can you use a pro mini 3.3 för this?
Or do i need a nano or pro mini 5v?@meanmrgreen
Sure you can use 3.3v for this. If you are using sct-013-000 version, adjust your burden according toBurden Resistor (ohms) = (AREF * CT TURNS) / (2√2 * max primary current)where Aref =3.3 (or at worst case, it's lower than 3.3V- if battery powered)
Also don't forget to change calibration which isCurrent Calibration Constant = CT TURNS / burden resistor -
One thing to keep in mind with this configuration: you're not actually measuring true power. Rather by not using a voltage reference, you're calculating apparent power, which is measured in VA (Volt Amps) vice Watts.
For resistive loads, apparent power and real power are the same, or very nearly so. But with reactive loads, e.g. motors, computer power supplies, compact flourescent or LED lamps, etc. they will differ considerably.
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Hi @patrick-schaerer ,
I got my setup running and was trying your code.I was testing this code on my AC unit which has 1600W max consumption. When I first ran it always reported a value of around 270W even when the AC unit was off from mains and in running condition it reported around 750W with compressor on and around 250W with compressor off.
I adjusted the value on lineemon1.current(ANALOG_INPUT_SENSOR, 30); // Current: input pin, calibrationTried values from 10 to 111(default as per emon lib) to calibrate it to report 0 in off condition. finally at 10 it reported zero but now when the AC is on it reports 270W max.
Could you please help me figure out where the problem could be. Thanks
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Thank for sharing the code and schematics, I cannot get it to run however, I always get 0 value whatever I do. Anyone has a suggestion about how to test this sensor the easiest way?
I have sct 013 030 sensor, and I connected it using the schematics provided here, I tried even the most basic examples I could find using EmonLib, I tried some basic examples using analog read and what not, but nothing seemed to work properly, I would always get either 0 or some fixed value.
I am connecting "first" and "last" conneciton on 3.5mm jack, but I also tried all combinations, and nothing seems to make a diffference.
I am using two resistors of 20Kohm as splitters, I am getting 2.43v between both side of them (using nano on 5V).
I am wrapping the module around the cable of the water cooker for example, which is 1.5KW, but values never change at all. It is either 0 or some max value (46A f.eks.) either with or without the load.
I was trying both nano and pro mini, same thing happens. Checked the circuit and connection between components several times.
This is the simplest code I found on the internet (not even mysensorized)void setup() { Serial.begin(9600); analogReference(INTERNAL); //analogReference(INTERNAL1V1); //solo Arduino Mega } void loop() { float Irms=get_corriente(); //Corriente eficaz (A) float P=Irms*220.0; // P=IV (Watts) Serial.print("Irms: "); Serial.print(Irms,3); Serial.print("A, Potencia: "); Serial.print(P,3); Serial.println("W"); //delay(100); } float get_corriente() { float voltajeSensor; float corriente=0; float Sumatoria=0; long tiempo=millis(); int N=0; while(millis()-tiempo<500)//Duración 0.5 segundos(Aprox. 30 ciclos de 60Hz) { voltajeSensor = analogRead(A0) * (1.1 / 1023.0);////voltaje del sensor corriente=voltajeSensor*30.0; //corriente=VoltajeSensor*(30A/1V) Sumatoria=Sumatoria+sq(corriente);//Sumatoria de Cuadrados N=N+1; delay(1); } Sumatoria=Sumatoria*2;//Para compensar los cuadrados de los semiciclos negativos. corriente=sqrt((Sumatoria)/N); //ecuación del RMS return(corriente); }Could it be that here in Norway we use two "phases" in the house? (or I could be wrong here either).
What is the most easy "idiot" proof way of testing this and getting some values? What could I be doing wrong?
Should I just order another sensor, can this "simple" sensor even be wrong?Any clues, anyone?
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I never got this going, have to play around with it again, but one thing I did do wrong was put the clip around both wires, instead of just the positive. I.e. putting it around + and - will give 0.
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Ok so it will not work around both wires?
You can not clamp it around extension cable and measure "something"?I basically just want to detect if stove is on or off, i was hoping to see at least a blip or anything really, can leave without actual numbers..
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After some research I realized that this cannot work with two wires as they cancel each other.
After some googling I have found this https://moderndevice.com/product/a1324-hall-effect-sensor/ in description they mention that it can do what I want, to detect if appliance is on or off even if two wires are in close proximity. They mention that you could detect 100W, although I am planning to monitor if stove is on or off, which is I assume more then 100w.
They also have more precise "boosted" version that is more precise https://moderndevice.com/product/current-sensor/ but I think I do not need it for now. -
I alread updated to MySensors 2.0
This is the update code:
I also edited the first post.
/** * The MySensors Arduino library handles the wireless radio link and protocol * between your home built sensors/actuators and HA controller of choice. * The sensors forms a self healing radio network with optional repeaters. Each * repeater and gateway builds a routing tables in EEPROM which keeps track of the * network topology allowing messages to be routed to nodes. * * Created by Henrik Ekblad <henrik.ekblad@mysensors.org> * Copyright (C) 2013-2015 Sensnology AB * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors * * Documentation: http://www.mysensors.org * Support Forum: http://forum.mysensors.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * ******************************* * * EnergyMeterSCT by Patrick Schaerer * This Sketch is a WattMeter used with a SCT-013-030 non invasive PowerMeter * see documentation for schematic * * Special thanks to Surge, who optimized my code. * * updated to mySensors Library 2.0 */ #define MY_RADIO_NRF24 #define MY_REPEATER_FEATURE #define MY_DEBUG #include <SPI.h> #include <MySensors.h> #include <EmonLib.h> #define ANALOG_INPUT_SENSOR 1 // The digital input you attached your SCT sensor. (Only 2 and 3 generates interrupt!) //#define INTERRUPT DIGITAL_INPUT_SENSOR-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define CHILD_ID 1 // Id of the sensor child EnergyMonitor emon1; MyMessage wattMsg(CHILD_ID,V_WATT); MyMessage kwhMsg(CHILD_ID,V_KWH); MyMessage msgKWH(CHILD_ID,V_VAR1); unsigned long SLEEP_TIME = 60000 - 3735; // sleep for 60 seconds (-4 seconds to calculate values) float wattsumme = 0; float kwh = 0; float wh = 0; int minuten = 0; //vorher 61 boolean KWH_received=false; //Humidity Sensor Code #include <DHT.h> #define CHILD_ID_HUM 2 #define CHILD_ID_TEMP 3 #define HUMIDITY_SENSOR_DIGITAL_PIN 2 DHT dht; float lastTemp; float lastHum; boolean metric = true; MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); //End of Humidity Sensor Code void setup() { //energy clamp code //gw.begin(incomingMessage, AUTO, true,0); Serial.begin(115200); emon1.current(ANALOG_INPUT_SENSOR, 30); // Current: input pin, calibration. double Irms = emon1.calcIrms(1480); // initial boot to charge up capacitor (no reading is taken) - testing request(CHILD_ID,V_VAR1); //end of energy clamp code //Humidity Sensor Code dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); metric = getConfig().isMetric; //End of Humidity Sensor Code } void presentation() { // Send the sketch version information to the gateway and Controller // Register this device as power sensor sendSketchInfo("Energy Meter SCT013", "2.0"); present(CHILD_ID, S_POWER); present(CHILD_ID_HUM, S_HUM); present(CHILD_ID_TEMP, S_TEMP); } void loop() { //process(); //KWH reveived check if (!KWH_received) request(CHILD_ID,V_VAR1); // power used each minute if (minuten < 60) { double Irms = emon1.calcIrms(1480); // Calculate Irms only if (Irms < 0.3) Irms = 0; long watt = Irms*240.0; // default was 230 but our local voltage is about 240 wattsumme = wattsumme+watt; minuten++; send(wattMsg.set(watt)); // Send watt value to gw Serial.print(watt); // Apparent power Serial.print("W I= "); Serial.println(Irms); // Irms } // end power used each minute // hours KW reading if (minuten >= 60) { wh = wh + wattsumme/60; kwh = wh/1000; send(kwhMsg.set(kwh, 3)); // Send kwh value to gw send(msgKWH.set(kwh, 3)); // Send kwh value to gw wattsumme = 0; minuten = 0; } // end of hourly KW reading // Humidity Sensor Code if (minuten == 15 || minuten == 30 || minuten == 45|| minuten == 60) { float temperature = dht.getTemperature(); if (isnan(temperature)) { Serial.println("Failed reading temperature from DHT"); } else if (temperature != lastTemp) { lastTemp = temperature; if (!metric) { temperature = dht.toFahrenheit(temperature); } send(msgTemp.set(temperature, 1)); Serial.print("T: "); Serial.println(temperature); } float humidity = dht.getHumidity(); if (isnan(humidity)) { Serial.println("Failed reading humidity from DHT"); } else if (humidity != lastHum) { lastHum = humidity; send(msgHum.set(humidity, 1)); Serial.print("H: "); Serial.println(humidity); } } //End of Humidity Sensor Code wait(SLEEP_TIME); } void receive(const MyMessage &message) { if (message.type==V_VAR1) { kwh = message.getFloat(); wh = kwh*1000; Serial.print("Received last KWH from gw:"); Serial.println(kwh); //send(kwhMsg.set(kwh, 3)); // Send kwh value to gw KWH_received = true; } }@patrick-schaerer can I use same code file for measuring current only using sct-013-030 and at other end I'll use other sensor to read ac voltage and with the help of that I'll calculate power.
I'm new on this. Just start learning and I'm using esp32 instead of Arduino.
Please share your suggestion on this. It will really help me to learn .
