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Power is an important parameter of power supply characteristics, and a power meter is an instrument for measuring active power. This is often encountered in hardware design work and in power supply questions in electrical competitions.
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Back to this project, the project uses the INA219 current sensor to measure current, power, and energy, and displays it on an OLED display. It is transmitted over the network and displayed in the Blynk application. In the Blynk application, you can visually see the readings of voltage, current, power, and energy on a graphical display interface.
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Arduino Pro Mini 328 – 5V/16MHz
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EPS8266 development board
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INA219 current sensor, a zero-drift bidirectional current/power monitor with I2C interface from TI
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450mAh battery
#include <SoftwareSerial.h>#include <Wire.h>SoftwareSerial nodemcu(2,3);#include <Adafruit_INA219.h>#include <Adafruit_SSD1306.h>#include <SPI.h>long int data;
#define OLED_RESET 4Adafruit_SSD1306 display(OLED_RESET);Adafruit_INA219 ina219;
unsigned long previousMillis = 0;unsigned long interval = 100;float shuntvoltage = 0;float busvoltage = 0;float current_mA = 0;float loadvoltage = 0;float energy = 0;
float sdata1 = 0; float sdata2 = 0; float sdata3 = 0;float sdata4 = 0;
String cdata;
void setup(){Serial.begin(9600); nodemcu.begin(9600); display.begin(SSD1306_SWITCHCAPVCC, 0x3C); ina219.begin();}
void loop(){ unsigned long currentMillis = millis(); if (currentMillis - previousMillis >= interval) { previousMillis = currentMillis; ina219values(); displaydata(); } if(nodemcu.available() == 0 ) { sdata1 = loadvoltage; sdata2 = current_mA; sdata3 = loadvoltage * current_mA; sdata4 = energy;
cdata = cdata + sdata1+","+sdata2+","+sdata3+","+sdata4; Serial.println(cdata); nodemcu.println(cdata); delay(1000); cdata = ""; }}
void displaydata() { display.clearDisplay(); display.setTextColor(WHITE); display.setTextSize(1); display.setCursor(0, 0); display.println(loadvoltage); display.setCursor(31, 0); display.println("V"); display.setCursor(62, 0); display.setCursor(75, 0); display.println(current_mA); display.setCursor(110, 0); display.println("mA"); display.setCursor(0, 6); display.println("--------------------");
display.setCursor(101, 14); display.println("A"); display.setCursor(108, 17); display.println("b"); display.setCursor(114, 20); display.println("i"); display.setCursor(120, 23); display.println("d"); display.setCursor(0, 13); display.println(loadvoltage * current_mA); display.setCursor(57, 13); display.println("mW"); display.setCursor(0, 23); display.println(energy); display.setCursor(57, 23); display.println("mWh"); display.display();}
void ina219values() { shuntvoltage = ina219.getShuntVoltage_mV(); busvoltage = ina219.getBusVoltage_V(); current_mA = ina219.getCurrent_mA(); loadvoltage = busvoltage + (shuntvoltage / 1000); energy = energy + loadvoltage * current_mA / 3600;}To use Blynk, you need to register for an account, and then you can set it up.
The project principle is simple, and the implementation difficulty is low, making it easy to measure parameters such as current, voltage, and power.
Measuring power supply characteristic parameters sounds complex, but with a current sensor, everything becomes easy. Similarly, many power supply design challenges can be solved by choosing the right chip and design method. Regarding power supply courses, Darwin collaborates with TI to launch the [Power EMI Special Series Trilogy]
Part 1: EMI Basics: How much do you know about power supply EMI (already online, click here to watch the video >>>)
Part 2: Full record of the evaluation experiment of the power board LM25149-Q1 (coming soon)
Part 3: Step-by-step guide to creating a controllable digital power supply project (coming soon)
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