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Electricity (current) Sensor

Made by santronix / Home Automation / Kids & Family / IoT

About the project

Build your own Smart Electricity sensor to detect the AC current in just 5 minutes.

Project info

Difficulty: Easy

Platforms: MediaTek Labs

Estimated time: 1 hour

License: Apache License 2.0 (Apache-2.0)

Items used in this project

Hardware components

	Monochrome 0.96" OLED Graphic Display	x 1
	Grove - Electricity Sensor	x 1
	Grove - OLED Display 1.12'' V2	x 1

Software apps and online services

Arduino IDE

Story

Dear Tech Friends,

In this tutorial, we are showing how can you build a simple Smart Electricity (Current) sensor using IoT prototype development board (MediaTek LinkInt One), Grove Electricity sensor and an OLED Display. The project is very simple and you can build it in just 5 mins.

How does it work?

So the current sensor is looped around the current carrying cable (The sensor only detects Alternating current, so please use only AC current cable).

Caution : High AC voltage 230V is involved, so please be careful and do not touch the bare cables. If you are not proficient handling AC currents, please take help from professionals)

The detected sensor is sensed at analog port A0 of the microcontroller board which then is converted to the instantaneous values which are displayed on the OLED Display.

Here's the video on how to setup and run

Smart Electricity Sensor

The software code or a program link is here.

https://github.com/santronix/iot_tutorials-mediatek-code/blob/master/Smart_Electricity_Sensor/Smart_Electricity_Sensor.ino

The components can be purchased from the below links

MediaTek LinkIt One Board : https://amzn.to/2ZxJ9fJ

Or buy the kit with grove shield : https://amzn.to/2PDe2uH

Grove Electricity sensor : https://www.seeedstudio.com/Grove-Electricity-Sensor-p-777.html

OLED Display : https://www.seeedstudio.com/Grove-OLED-Display-0-96-p-781.html

The complete instructions are in the video. Use Arduino IDE for writing the software code.

Happy learning!

Schematics, diagrams and documents

Connection for Smart Electricity Sensor

Code

Software Code for Smart Current Sensor

/*******************************************************
 * SANTRONIX <info@santronix.in>
 * 
 * This file is part of SANTRONIX Mediatek LinkIt Tutorials Project.
 * 
 * SANTRONIX Mediatek LinkIt Tutorials Project can not be copied and/or distributed without the express
 * permission of SANTRONIX
 *******************************************************/
#include <math.h>
#include <Wire.h>
#include <SeeedOLED.h>

//Connect Electricity sensor at Analog Input A0
#define ELECTRICITY_SENSOR A0 // Analog input pin that sensor is attached to

float amplitude_current;     //amplitude current
float effective_value;       //effective current

void setup()
{
    Serial.begin(9600);
    pinMode(ELECTRICITY_SENSOR, INPUT);

    Wire.begin();
    SeeedOled.init();  //initialze SEEED OLED display
  
    SeeedOled.clearDisplay();          //clear the screen and set start position to top left corner
    SeeedOled.setNormalDisplay();      //Set display to normal mode (i.e non-inverse mode)
    SeeedOled.setPageMode();           //Set addressing mode to Page Mode
}
void loop()
{
    int sensor_max;
    sensor_max = getMaxValue();

    //the VCC on the Grove interface of the sensor is 5v
    amplitude_current=(float)sensor_max/1024*5/800*2000000;
    effective_value=amplitude_current/1.414;//minimum_current=1/1024*5/800*2000000/1.414=8.6(mA)
                                            //Only for sinusoidal alternating current
    
    SeeedOled.setTextXY(0,0);          //Set the cursor to Xth Page, Yth Column  
    SeeedOled.putString("Max Value:");
    SeeedOled.putFloat(sensor_max, 0);
    SeeedOled.putString("mA");   
    SeeedOled.setTextXY(2,0);          //Set the cursor to Xth Page, Yth Column
    SeeedOled.putString("Amplitude:"); //Print the String  
    SeeedOled.putFloat(amplitude_current,0);
    SeeedOled.putString("mA");
    SeeedOled.setTextXY(4,0);          //Set the cursor to Xth Page, Yth Column
    SeeedOled.putString("Current:");
    SeeedOled.putFloat(effective_value,2);
    SeeedOled.putString("mA");
}

/*Function: Sample for 1000ms and get the maximum value from the SIG pin*/
int getMaxValue()
{
    int sensorValue;                    //value read from the sensor
    int sensorMax = 0;
    uint32_t start_time = millis();
    while((millis()-start_time) < 1000)//sample for 1000ms
    {
        sensorValue = analogRead(ELECTRICITY_SENSOR);
        if (sensorValue > sensorMax)
        {
            /*record the maximum sensor value*/
            sensorMax = sensorValue;
        }
    }
    return sensorMax;
}

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About the project

Project info