Overview of Input Devices and Their Applications

Input Devices

Sensors converting environmental signals to electrical signals.

Light Dependent Resistor (LDR)

Changes resistance based on light intensity variations.

LDR Applications

Used in street lamps, radios, and mobile phones.

Thermistor

Resistance varies with temperature changes.

Positive Temperature Coefficient (PTC)

Resistance increases as temperature increases.

Negative Temperature Coefficient (NTC)

Resistance decreases as temperature increases.

Thermistor Applications

Used in toasters, refrigerators, and hair dryers.

Switches

Devices that input signals by opening or closing.

Pressure Sensors

Detect pressure applied by objects to input signals.

Signal Input Uses

Turning devices on or off based on pressure.

Object Travel Limit

Detects when an object reaches a designated limit.

User Activation

Starts processes by manual pressure application.

Closure Detection

Identifies if a device or door is closed.

Safety Mechanism

Stops machines if safety guards are opened.

Environmental Sensors

Measure light, temperature, and pressure for processing.

Electrical Current Flow

Movement of electric charge through a conductor.