Micro:Bit Distance Detection With Ultrasonic Sensor and OLED

OLED Display

What it is: A small screen that displays text, graphics, or simple animations.

OLED = Organic Light-Emitting Diode.

Pins:

• VCC/VDD - Power (3.3V or 5V)

• GND - Ground

• SCL - Clock signal (for I2C communication)

• SDA - Data signal (for I2C communication)

Use case: Display sensor readings, status messages, menus, or simple graphics.

I2C (Inter-Integrated Circuit)

What it is: A communication protocol that allows multiple devices to talk to a microcontroller using only 2 wires.

How it works:

• SCL (Serial Clock) - Timing/synchronization wire

• SDA (Serial Data) - Data transfer wire

• Multiple devices share the same 2 wires

• Each device has a unique address (like 0x68 for MPU6050, 0x3C for OLED)

Advantage: You can connect many devices (OLED, sensors, etc.) using just 2 pins instead of needing separate pins for each device.

Ultrasonic Sensor (HC-SR04)

What it is: A distance sensor that uses sound waves (like sonar or bat echolocation) to measure how far away objects are.

Pins (typically 4):

• VCC - Power (5V)

• GND - Ground

• TRIG (Trigger) - Send signal to start measurement

• ECHO - Receives signal when sound bounces back

How it works:

1. Sends out ultrasonic sound pulse

2. Sound bounces off object

3. Measures time for echo to return

4. Calculates distance = (time × speed of sound) / 2

Range: Typically 2cm to 400cm

Micro:bit Breakout Board

What it is: An adapter board that makes it easy to connect the BBC micro:bit to other components.

Features:

• Edge connector pins broken out - All micro:bit pins available as standard headers

• Screw terminals or pin headers - Easy wire connections (no soldering needed)

• Voltage regulation - Some boards provide 3.3V and 5V outputs

• I2C pins clearly labeled - Easy to find SCL and SDA

• Extra GND and power pins - Multiple devices can share power