Computing · Year 10 · Architecting the Machine · Autumn Term

Output Devices: Screens, Printers, Actuators

Exploring various output devices, including screens, printers, and actuators in embedded systems.

• National Curriculum Attainment Targets
• GCSE: Computing - Input and Output Devices

About This Topic

Output devices transform digital signals into human-readable or physical forms. Screens like LCD, LED, and OLED displays vary in resolution, power use, and viewing angles, making them ideal for dynamic visuals. Printers, such as inkjet and laser models, produce permanent hard copies but differ in speed, cost per page, and colour accuracy. Actuators in embedded systems, including motors, speakers, and haptic vibrators, enable physical responses like movement or touch feedback.

This topic fits within the 'Architecting the Machine' unit by linking output to input devices for complete system design. Students compare devices to select the best for tasks, such as a high-contrast screen for accessibility or haptic actuators for immersive gaming interfaces. It aligns with GCSE Computing standards on input/output, fostering skills in analysis and ethical considerations like e-waste from printers.

Active learning shines here through prototyping and testing. When students assemble simple circuits with actuators or benchmark screen refresh rates, they grasp trade-offs firsthand. Collaborative design challenges reveal how output choices impact user experience, turning theoretical specs into practical decisions.

Key Questions

1. Compare the advantages and disadvantages of different output devices for presenting information.
2. Design an interface that effectively uses both input and output devices for a specific task.
3. Analyze how haptic feedback output devices enhance user experience.

Learning Objectives

• Compare the advantages and disadvantages of screens, printers, and actuators for specific output tasks.
• Design a user interface prototype that effectively integrates input and output devices for a given scenario.
• Analyze the impact of haptic feedback on user experience in digital applications.
• Explain the technical differences between common screen technologies (e.g., LCD, LED, OLED) and printer types (e.g., inkjet, laser).

Before You Start

Introduction to Input Devices

Why: Students need to understand how data is entered into a system before exploring how it is outputted.

Basic Computer Hardware Components

Why: A foundational understanding of how computers process information is necessary to comprehend the role of output devices.

Key Vocabulary

Actuator	A component of an embedded system that converts an electrical signal into a physical action, such as movement, sound, or vibration.
Haptic Feedback	Output that simulates the sense of touch, often used in devices to provide tactile responses to user interactions.
Resolution	The number of pixels that can be displayed on a screen, typically measured in width by height, affecting image clarity.
Inkjet Printer	A type of printer that produces a hard copy by spraying tiny droplets of ink onto paper.
Laser Printer	A type of printer that uses a laser beam to create an image on a drum, which then attracts toner and transfers it to paper.

Watch Out for These Misconceptions

Common Misconception

All screens work the same way regardless of type.

What to Teach Instead

Screens differ in technology: LCD uses backlights, OLED emits light per pixel for true blacks. Hands-on demos with side-by-side images help students observe contrast and power differences, correcting assumptions through direct comparison.

Common Misconception

Actuators are only for robotics, not everyday devices.

What to Teach Instead

Actuators appear in phones for haptics and speakers for audio output. Building circuits with motors shows their role in embedded systems, helping students connect abstract concepts to familiar tech via tangible experiments.

Common Misconception

Printers are always superior for permanent output.

What to Teach Instead

Printers excel in permanence but lag in speed and eco-friendliness compared to digital screens. Group testing of costs and waste builds data-driven arguments, shifting views through evidence from active analysis.

Active Learning Ideas

Stations Rotation: Device Comparison

Prepare stations with sample screens, printers, and actuators like vibration motors. Groups test resolution by displaying images, print samples for quality checks, and trigger actuators for response time. Rotate every 10 minutes and note advantages/disadvantages in a shared table.

45 min·Small Groups

Design Challenge: Smart Home Interface

Pairs sketch and prototype an interface using cardboard mocks, LEDs for screens, and buzzers for actuators. Incorporate inputs like buttons, then test for effectiveness in a scenario like alerting for doorbells. Present and peer-review designs.

50 min·Pairs

Haptic Feedback Lab

Small groups connect vibration motors to microcontrollers via simple code. Program patterns for notifications, test on phones or wearables, and survey user reactions. Discuss how feedback enhances non-visual UX.

35 min·Small Groups

Benchmark Debate: Printers vs Screens

Whole class divides into teams to benchmark a printer and screen on criteria like cost and permanence using school devices. Collect data, then debate best uses for tasks like reports or presentations.

30 min·Whole Class

Real-World Connections

• Video game developers use haptic actuators in controllers and VR peripherals to create immersive experiences, allowing players to feel in-game events like explosions or impacts.
• Automotive engineers select specific screen displays for car dashboards, considering factors like glare resistance, touch sensitivity, and information hierarchy for driver safety and usability.
• Medical device manufacturers integrate actuators into prosthetics and surgical robots, providing sensory feedback to surgeons or users for more precise control.

Assessment Ideas

Discussion Prompt

Present students with three scenarios: a public information kiosk, a mobile gaming controller, and a digital art display. Ask them to discuss which output device (screen type, printer, or actuator) would be most suitable for each, justifying their choices based on resolution, speed, cost, and user interaction.

Quick Check

Provide students with a list of output device specifications (e.g., high refresh rate, low power consumption, physical vibration capability, color accuracy). Ask them to match each specification to the most appropriate output device and explain why that device is a good fit for a particular application.

Exit Ticket

Ask students to write down one advantage and one disadvantage of using a printer versus a screen for displaying information. Then, have them identify one example of an actuator and describe the type of output it produces.

Frequently Asked Questions

What are the advantages and disadvantages of different output devices like screens and printers?

Screens offer instant updates, portability, and low ongoing costs but lack permanence and may strain eyes. Printers provide tangible outputs ideal for sharing but involve high ink expenses, slow speeds, and environmental impact. Teach by having students rate devices against task needs, such as reports versus slideshows, to weigh trade-offs clearly.

How can active learning help students understand output devices?

Active approaches like station rotations and prototyping let students handle screens, printers, and actuators directly. They measure refresh rates, feel haptic feedback, and tally printing costs, making specs concrete. Group discussions then solidify comparisons, boosting retention and design skills over passive lectures.

What role do actuators play in embedded systems?

Actuators convert signals to motion or force, like motors in drones or vibrators in wearables. In GCSE projects, students program them for feedback, analysing how they improve interfaces. Simple Arduino kits demonstrate integration with inputs for responsive systems.

How does haptic feedback enhance user experience in computing?

Haptic devices provide tactile cues, like vibrations confirming taps, aiding accessibility and immersion in games or alerts. Students explore this by coding motor patterns and user-testing, noting reduced errors in low-visibility scenarios. It teaches inclusive design principles central to modern computing.