⚠️☠️ HIGH VOLTAGE WARNING – EDUCATIONAL USE ONLY ☠️⚠️

This project involves measurement of voltages up to ±250 V (500 V peak-to-peak) using a 100:1 high-voltage divider.

⚡ These voltage levels are lethal. Improper handling can result in serious injury or death.

Only trained and competent personnel familiar with electrical safety, insulation, creepage/clearance requirements, and high-voltage hazards should work with these circuits.

Use appropriate protective equipment and follow all applicable laws, standards, and safety regulations.

Disclaimer: This information is provided for educational purposes only. The author assumes no responsibility for injury, death, or property damage resulting from use of lithium-ion batteries. Always follow all applicable local laws, regulations, and safety standards when working with high-energy battery systems.

Arduino UNO Power Measurement – Extended Example

This example demonstrates how to measure and calculate power consumption using an Arduino UNO and an ACS758 current sensor (and voltage divider). The system computes:

Detailed Steps
Arduino Code 

/*
 * Arduino UNO Power Measurement with Energy Calculation
 * Measures RMS voltage, RMS current, power, and energy consumption.
 * Uses ACS758 ADC for accurate measurement.
 */

const int voltagePin = A0;    // Voltage divider connected to A0
const int currentPin = A1;    // Current sensor connected to A1

const float voltageDividerRatio = 200.0; // Voltage divider ratio (e.g., 200:1)
const float adcMaxVoltage = 5.0;         // Maximum ADC voltage (5V)
const float maxADCValue = 1023.0;        // Maximum ADC value
const float samplingInterval = 60.0;     // Sampling interval in seconds

// Setup ACS758
ACS758 ads(0x48); // Create ACS758 object with I2C address

// Energy variables
float totalEnergyWh = 0.0;
float totalEnergyJ = 0.0;

void setup() {
    Serial.begin(115200);
    Serial.println("Arduino PFC measurement, by Peter Ivan Dunne, ©2024, all rights reserved");
    Serial.println("Released under the Mozilla Public License");
    Serial.println("https://jazenga.com/educational");
    Serial.println("Provides RMS voltage, RMS current, Power factor, Total energy and Frequency");
}

void loop() {
    float voltage = ads.readADC(voltagePin) * (adcMaxVoltage / maxADCValue);
    voltage *= voltageDividerRatio;

    float current = ads.readADC(currentPin) * (adcMaxVoltage / maxADCValue);

    float rmsVoltage = voltage / sqrt(2);
    float rmsCurrent = current / sqrt(2);

    float power = rmsVoltage * rmsCurrent;

    float realPower = realPowerSum / NUM_SAMPLES;
    float apparentPower = voltageRMS * currentRMS;
    float powerFactor = realPower / apparentPower;

    float energyWh = (power * samplingInterval) / 3600.0;
    float energyJ = energyWh * 3600.0;

    totalEnergyWh += energyWh;
    totalEnergyJ += energyJ;

    Serial.print("RMS Voltage: ");
    Serial.print(rmsVoltage, 2);
    Serial.print(" V, RMS Current: ");
    Serial.print(rmsCurrent, 2);
    Serial.print(" A, Power: ");
    Serial.print(power, 2);
    Serial.print(" W, Power Factor: ");
    Serial.print(powerFactor, 2);
    Serial.print(", Total Energy: ");
    Serial.print(totalEnergyWh, 2);
    Serial.print(" Wh, ");
    Serial.print(totalEnergyJ, 2);
    Serial.println(" J");
}
Explanation
How It Works