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Project: Voltage Sensor with OLED Display using Arduino

This project demonstrates how to measure and display voltage using an Arduino, a voltage sensor (such as a resistive voltage divider), and an OLED display (SSD1306). The measured voltage is displayed on the OLED in real-time.

Components Required:

Arduino (Uno, Mega, or any compatible board)

Voltage Sensor (Resistive Voltage Divider)

0.96" I2C OLED Display (SSD1306)

Connecting Wires

Circuit Connections:

Voltage Sensor:

VCC → Voltage source

GND → Ground

OUT → A0 (Analog pin of Arduino)

OLED Display (SSD1306 - I2C):

VCC → 5V (or 3.3V depending on the module)

GND → GND

SCL → A5 (for Arduino Uno)

SDA → A4 (for Arduino Uno)

---

Arduino Code:

Make sure you install the Adafruit SSD1306 and Adafruit GFX libraries before uploading the code.





SCREEN_WIDTH 128
SCREEN_HEIGHT 64
OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int voltageSensorPin = A0;
float vRef = 5.0; // Reference voltage (change if using 3.3V)
float resistorFactor = 5.0; // Divider factor (adjust according to resistor values)

void setup() {
Serial.begin(9600);

if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for (;;);
}

display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0, 10);
display.println("Voltage Sensor");
display.display();
delay(2000);
}

void loop() {
int sensorValue = analogRead(voltageSensorPin);
float voltage = (sensorValue * vRef / 1023.0) * resistorFactor;

Serial.print("Voltage: ");
Serial.print(voltage);
Serial.println("V");

display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0, 20);
display.print("V: ");
display.print(voltage);
display.print(" V");
display.display();

delay(1000);
}

---

How It Works:

1. The voltage sensor outputs an analog voltage corresponding to the measured voltage.

2. The Arduino reads the analog value from A0 and converts it into actual voltage using the voltage divider ratio.

3. The calculated voltage is displayed on the OLED screen in real-time.

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Best schematic tool for designing and prototyping

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Patnitop Kashmir

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Hello Everyone

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