Connexa

Prototype Design

Hardware parts:

1. Touch screen display: When the device is powered up, you will see your desktop application and can freely navigate through the application with a stylus.
2. Camera: 5-megapixel camera with a wide-angle view.
3. Charging port: A micro USB socket that can supply 5V to the touch screen.
4. HDMI port: HDMI port that helps to display the UI on the touch screen.
5. USB ports: Can be used to connect external peripherals such as keyboard and mouse.
6. Extendable arm: Can be adjusted freely up and down as well as to the front and back to properly place your view in front of the camera.
7. UPS housing: Contains the backup battery unit which will uninterruptibly supply power to the device even in case of power failure.
8. On/Off button: Turns the device on and off
9. 12V DC jack: Connect a 12V adapter to this slot to charge the UPS unit.

Circuit diagram of the proctoring device on the student's side

The proctoring device in the student's side has 2 main components.

• The raspberry pi 3B+ module with a touch screen,camera,microphone and speaker connected.
• Power Supply unit

Circuit diagram of the power supply unit

• The power supply unit has three Li-ion batteries to supply power to the main unit incase of a power failure.
• The adjustable step-down power supply module supplies a constant 5V power supply to the raspberry pi board
• The 3S charging board regulates the voltage supplied to the raspberry pi unit and cuts off supply when the batteries are discharging below the average value.