Welcome to Enabling Technologies!
Ever wondered why your smartphone can do so many different things, like pay for groceries, track your morning run, or unlock just by looking at your face? It’s all thanks to enabling technologies. These are the "building blocks" that allow digital devices to be designed in specific ways and perform amazing tasks.
In these notes, we are going to break down these technologies. Don't worry if some of the names sound technical—we’ll use everyday examples to make everything clear. Let’s dive in!
1. Location and Identification Technologies
These technologies help our devices know where they are and what they are interacting with.
Global Positioning System (GPS)
What is it? A system of satellites that send signals to your device to calculate your exact location on Earth.
Impact on Design: Because GPS components have become so small, they can now fit into watches and even pet collars.
Example: Using Google Maps to find your way to a friend's house or Uber tracking where your driver is.
RFID (Radio-Frequency Identification)
What is it? This uses tiny "tags" that can be read from a short distance using radio waves. The tag doesn't usually need a battery!
Example: Those plastic security tags on clothes in a shop that beep if you walk out without paying.
NFC (Near-Field Communication)
What is it? A specialized version of RFID designed for very close range (usually a few centimeters).
Impact on Design: It allows devices to be used as digital wallets.
Example: Using Apple Pay or Google Pay by tapping your phone on a card reader.
QR (Quick Response) Codes
What is it? A 2D barcode (the square black-and-white patterns) that can be scanned by a camera.
Example: Scanning a code on a restaurant table to see the menu.
Quick Review: Remember, NFC is for "tapping" things (very close), RFID is for "tracking" things (short distance), and GPS is for "mapping" (global distance).
2. Interaction and Security
How we talk to our devices and how they keep our secrets safe.
Touchscreens
Impact: Touchscreens removed the need for physical buttons, allowing devices like Tablets to have much larger screens in a smaller body.
Biometrics
What is it? Using your unique physical characteristics to identify you.
Types to know: Fingerprint scanners, facial recognition, and iris (eye) scanning.
Why use it? It’s much harder for a hacker to steal your thumbprint than it is to guess your password!
Sensors
What is it? Small components that "feel" the environment.
Examples:
• Accelerometer: Detects when you tilt your phone to rotate the screen.
• Light Sensor: Dims your screen automatically when you are in a dark room.
3. The "Guts" of the Device: Performance & Storage
This is where the actual "thinking" and "remembering" happens. Don't worry if this seems tricky; just think of it like a kitchen!
The Processor (CPU)
The "brain" of the device. It follows instructions and does calculations.
Analogy: The processor is like a Chef. A faster chef (processor) can cook meals (run apps) much more quickly.
Memory (RAM)
What is it? Temporary storage that the processor uses while it is working.
Analogy: Memory is like the Countertop. The more space you have on the counter, the more ingredients the chef can have out at once without getting slowed down.
Storage
What is it? Where your files, photos, and apps live permanently (even when the power is off).
Analogy: Storage is like the Cupboard. It holds everything long-term, but it takes a little longer to get things out of it than from the counter.
Memory Aid: RAM is Really Active Memory (it works while the device is on). Storage is for the Stuff you keep forever.
4. Design Trends: Making it Portable
Modern devices are getting smaller and lasting longer because of these two factors:
Miniaturisation
This is the process of making components (like processors and sensors) smaller and smaller.
Impact: This is why we can have Wearable Computers like smartwatches that have the same power as old desktop PCs.
Battery Power
As batteries get better (higher capacity) and components use less energy, our devices can stay "mobile" for longer.
Common Mistake: Don't confuse capacity with efficiency. Capacity is how much "juice" the battery holds; Efficiency is how slowly the device drinks that juice!
5. Connectivity
Connectivity is simply the ability of a device to connect to other devices or the internet.
Cabled: Using USB (for data/power) or HDMI (for high-definition video).
Wireless: Using Wi-Fi or Bluetooth.
6. The Math Bit: Calculating Data (IEC Units)
In your exam, you might need to calculate how big a file is or how long it takes to send. The IEC uses units of 1024, not 1000!
The Scale:
1 Kibibyte (KiB) = \( 2^{10} \) bytes (1024 bytes)
1 Mebibyte (MiB) = \( 2^{20} \) bytes (1024 KiB)
1 Gibibyte (GiB) = \( 2^{30} \) bytes (1024 MiB)
Transmission Formula:
To find out how long a file takes to send:
\( \text{Time (seconds)} = \frac{\text{File Size (bits)}}{\text{Bandwidth (bits per second)}} \)
Note: Always make sure your units match! If the file is in Bytes and the speed is in bits, you must multiply the file size by 8 first (because 1 Byte = 8 bits).
Key Takeaways for Topic 1.1.2
• Miniaturisation allows for wearable tech.
• Biometrics increases security by using physical traits.
• Sensors allow devices to react to the physical world (tilt, light, movement).
• NFC is the technology behind "contactless" payments.
• Processors do the work, Memory handles current tasks, and Storage keeps files forever.
You've finished this section! Take a quick break, and when you're ready, we'll look at how to select the right software for these devices.