Arduino Line Trace Sensor Module

Jargon buster

Plain-language definitions for the technical terms used above.

active LOW

Active LOW describes a signal that is treated as active, asserted or 'on' when it sits at a low voltage near ground, rather than at a high voltage. It applies to inputs, outputs and control lines (such as reset or chip-select), so it matters when wiring devices so that signal levels are interpreted as intended.

GND

GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.

microcontroller

A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.

potentiometer

A variable resistor usually turned with a knob or shaft to create an adjustable electrical signal. It is often used for inputs such as volume, brightness or position, so it helps beginners learn how a microcontroller reads changing values.

VCC

VCC is the positive power-supply connection on a chip or module. Connecting it to the correct supply voltage is needed for the part to power on and helps avoid damaging the electronics.