Lesson 7 Pupil Notes
Title
Wireless Control With HC-05 And Android
Big Question
How can the same board be controlled without a USB cable running all the way to the dashboard?
What This Lesson Is About
The HC-05 adds wireless control by presenting a serial-style link to the microcontroller. We compare controlling the board from the browser dashboard and from the Android app.
Key Words
- Bluetooth
- wireless
- UART
- app
- pairing
- serial
Before You Start
- Check that the HC-05 module is connected.
- Make sure Bluetooth is enabled on the phone.
- Be ready to compare wired and wireless control.
What To Remember
- Bluetooth can replace a short cable for control
- the Android app is another front end for the same firmware
- the HC-05 still looks like a UART-style serial link to the microcontroller
- changing the user interface does not always require changing the whole firmware design
What We Did
- connected with the Android app
- sent commands wirelessly
- compared wired and wireless control
- discussed how the same firmware can support different interfaces
What To Look For
- what feels different between browser and phone control?
- what stays the same?
- where do you still see the same command-and-response idea?
Try This
- Connect over Bluetooth.
- Change a mode or set some text.
- Compare the response with the same action over USB or the browser.
Why It Matters
Real embedded products often support more than one control interface. This lesson shows how a system can stay logically consistent even when the front end changes.
Check Yourself
- What does the HC-05 add to the system?
- Why is UART still relevant in a wireless lesson?
- What is similar between the Android app and the web dashboard?
- What is different?
Reflection
- One thing that felt easier wirelessly:
- One thing that felt harder wirelessly:
- One reason a product might offer both wired and wireless control: