Load: Two Fan (Fan A = 20W & Fan B = 25W)
Sensor: 5A ACS712 Chip
Microcontroller: Atmega328P
Trying to measure my wattusage device with 2 load (both fan) but here's the problem.
Measuring just one load (any of those fan) nothing bad happen. Current and wattusage is all fine. But when i added a second fan, the other fan reduced the watt usage (under 5W) instead of adding it to 40W. It's like First Fan - Second Fan instead of First Fan + Second Fan
Pict of single load
Pict of having two loads
My full codes:
#include <lorawan.h>
#include <ACS712.h>
const char *devAddr = "xxxxxxx"; //Device Address SLALORA_11
const char *nwkSKey = "xxxxxxxxxxxxxxxx0000000000000000";
const char *appSKey = "0000000000000000xxxxxxxxxxxxxxxx";
const unsigned long interval = 30000; //Message Uplink Interval
const int analogIn = A0; //ACS712 Pinout
const int relay = 3; //Relay Pinout
const int led = 13; //LED Pinout
unsigned long previousMillis = 0;
unsigned long led_millis = 0;
char myStr[50];
byte outStr[255];
byte recvStatus = 0;
int port, channel, freq;
bool newmessage = false;
bool LedState = false;
String RelayStatus;
//RFM Pinout
const sRFM_pins RFM_pins = {
.CS = 10,
.RST = 4,
.DIO0 = 7,
.DIO1 = 8,
};
//ACS712 Setup
ACS712 ACS(A0, 5.0, 1024, 185); //ACS712(uint8_t analogPin, float volts = 5.0, uint16_t maxADC = 1023, uint8_t mVperA = 66/100/185);
void setup() {
//Setup Device
Serial.begin(115200);
Serial.println("Starting...");
pinMode(analogIn, INPUT);
pinMode(relay, OUTPUT);
pinMode(led, OUTPUT);
delay(5000);
//Setup ACS712
Serial.println("Setting Up ACS712 Current Sensor...");
delay(2000);
ACS.setMidPoint(512); //Max ADC/2
Serial.print("MidPoint = ");
Serial.println(ACS.getMidPoint());
ACS.setNoisemV(70);
Serial.print("Noise mV = ");
Serial.println(ACS.getNoisemV()); //Noise = 21mV based on Datasheet
delay(1000);
//Setup RFM95W
Serial.println("Setting Up LoRa RFM95W...");
delay(2000);
if (!lora.init()) {
Serial.println("RFM95 Not Detected");
return; //Device Stopped
}
else {
Serial.println("LoRa Initialization Success.");
}
lora.setDeviceClass(CLASS_A); //Set LoRaWAN Class change CLASS_A or CLASS_C
lora.setDataRate(SF10BW125); //Set Data Rate
lora.setFramePortTx(5); // Set FramePort Tx
lora.setChannel(MULTI); // Set Channel
lora.setTxPower(15); // Set TxPower to 15 dBi (max)
// Put ABP Key and DevAddress here
lora.setNwkSKey(nwkSKey);
lora.setAppSKey(appSKey);
lora.setDevAddr(devAddr);
}
void loop() {
int mA = ACS.mA_AC(); //ACS712 Current
float Watt = ((220*mA)/1000.0*-1);
char daya[6];
//Uplink to Antares
if (millis() - previousMillis > interval) {
previousMillis = millis();
dtostrf(Watt, 6, 2, daya);
sprintf(myStr, "ACS Current(mA)= %d. Watt Usage(W)= %s", mA, daya);
Serial.println("Sending to Antares... ");
Serial.println(myStr);
lora.sendUplink(myStr, strlen(myStr), mA);
port = lora.getFramePortTx();
channel = lora.getChannel();
freq = lora.getChannelFreq(channel);
Serial.print(F("Port: ")); Serial.print(port); Serial.print(" ");
Serial.print(F("Ch: ")); Serial.print(channel); Serial.print(" ");
Serial.print(F("Freq: ")); Serial.print(freq); Serial.println(" ");
}
// Check Lora RX
lora.update();
}
Needed help to fix on how is this happening. Thank you in advance!
Hello panduh31
Keep it simple and stupid.
Run a tutorial to the hardware selected.
If you are happy with the results of the tutorials you can merge these to the project by using control structures.
Have a nice day and enjoy coding in C++.
I was measuring a watt usage device using a single load (22W Fan) and it works just fine, below is the measurements result:
Then i measured my second fan (20W Fan) and here's the result:
And here's when i used both fan as the loads.
Wierdly, the image show the watt is not working normally. I used Wattmeter device for comparison and it shows 40Watt but the ACS seems not working normally. Tried with other load too and there goes the same problem again.
Here's the code i used for calculating the Ampere and the Watts
int mA = ACS.mA_AC(); //ACS712 Current
float Watt = ((220*mA)/1000.0);
if(Watt < 0){
Watt = Watt*-1;
}
dtostrf(Watt, 4, 2, daya);
sprintf(myStr, "ACS Current(mA)= %d. Watt Usage(W)= %s", mA, daya);
Your two topics on the same or similar subject have been merged.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
Repeated duplicate posting could result in a temporary or permanent ban from the forum.
Could you take a few moments to Learn How To Use The Forum
It will help you get the best out of the forum in the future.
Thanks for the information and reminder. Will keep that in mind.
Yes, because im using a table fans not a DC Fans. The Table Fans connected to an electrical terminal which is controlle by my device.
It works! Thanks for the help!
Used 4 Loads that is Phone 10W and Laptop charger 45W, 22W fan, and 500W electrical teapot. The rest is fluctuation around 10-15W.
