Applications and implications

Assignment

  • propose a final project that integrates the range of units covered, answering:

what will it do?

  • I want to make a device which can be use in recruitment test for different post and will be very helpful for the testing service providers which conduct recruitment test at large scale like National Testing services, SIBA testing Services in Pakistan which conduct paper based test.

  • Because of the large number of candidates it is difficult to conduct an online computer based test for that we need large number of computers and internet availability.

  • Mostly the test conduct in open space so the device must be visible in daylight easily and must be portable. For that I am will use E-paper display

  • This device will be limited to Multiple choice Questions only

  • It can communicate with the local network using wifi to send the results, candidate information etc.

who's done what beforehand?

  • After searching on internet I could not found a purpose specific device for MCQs based examinations which is based on either E-paper display or LED/LCD display.
  • Currenlty the same thing is done by laptops, computers and tablets.
  • As I mentioned earlier that I you are conducting test are large scale than laptops, computers etc will be expensive, another disadvantage is the outdoor visibility of such devices.

what materials and components will be required?

  • 1. E-paper Display
  • 2. Resistive touch
  • 3. 3D printed/laser cutted Casing
  • 4. Wifi (ESP8266)
  • 5. 3.7 Lipo battery
  • 6. Power Circuit (Charging lipo and supply power)
  • 7. Microcontroller based controlling circuit
  • 8. microSD card.
  • 9. LEDs and phototransistor for backlight circuit.
  • 9. Few capacitors of 0.1uf and 10uf for power and controlling ciruit.
  • 10.Few SMD resistors of different values.

where will they come from?

  • 1. E-paper Display (from aliexpress.com Click here for link )
  • 2. Resistive touch (from aliexpress.com Click here for link )
  • 3. 3D printed/laser cutted Casing (In fablab barcelona)
  • 4. Wifi (ESP8266) (from aliexpress.com Click here for link )
  • 5. 3.7 Lipo battery (from aliexpress.com Click here for link )
  • 6. Power Circuit (In fablab barcelona)
  • 7. Microcontroller based controlling circuit (In fablab barcelona)
  • 8. microSD card. (from aliexpress click here for link)
  • 9. LEDs and phototransistor for backlight circuit.(In fablab barcelona)
  • 9. Few capacitors of 0.1uf and 10uf for power and controlling ciruit. (In fablab barcelona)
  • 10.Few SMD resistors of different values. (In fablab barcelona)

how much will it cost?

Components Number of components * Price of components(Euro) Total price (Euro) link
E-paper Display
1 * 51
51
Click here for link
Resistive touch
1 * 6.15
6.5
Click here for link
Wifi (ESP8266)
1 * 2
1.45
Click here for link
3.7 Lipo battery
1 * 5
5
Click here for link
microSD card
1 * 1.5
1.5
click here for link
ATMEGA32u4
1 * 3
3
www.digikey.es
Regulator (3.3V)
1 * 0.1
0.1
www.digikey.es
MCP73831T-2A (lipo charging IC)
1 * 0.5
0.5
www.digikey.es
LEDs
10 * 0.1
1
click here for link
Capacitors
10 * 0.1
1
click here for link
Resistors
20 * 0.1
2
www.digikey.es
USB mini connector
2 * 0.5
1
www.digikey.es
PLA 3D printed pieces
20Euro/kg required 100g.
2
www.digikey.es
Finger printscanner
1 * 31 .
31
https://www.sparkfun.com/products/13007
Total Cost
--
105.7
--

what parts and systems will be made?

  • 1. 3D printed/laser cutted Casing
  • 2. PCB board of Wifi interfacing circuit (ESP8266)
  • 3. PCB board of Power Circuit (Charging lipo and supply power)
  • 4. PCB board of ATEMGA32u4 based Microcontroller for controlling device
  • 5. PCB Backlight circuit using LEDs and phototransistors.
  • 6. An Applications for send and receiving data from and to device.
  • 7.Firmware for device which can control E-papar display, Wifi, Resistive touch, memory card and backlights for display.

what processes will be used? and what tasks need to be completed?

  • Electroincs: Eagle PCB Designing and interfacing of following modules.
    • Fableo based ATEMGA32u4 board
    • Input + Output devices
  • 3D Designing using rhinoceros: Case designing
  • Electroincs Production: fabmodules, Milling and soldering.
  • 3D Printing: Case printing
  • Laser cutting: Cutting for Case and PCBs
  • Networking: Wifi interfacing
  • Programming: Writting firmware in Arduino IDE.
  • Interface Development: TCP Client in Python and tkinter.

what questions need to be answered?

  • Which display is to use? size and type?
  • Which wifi chip to use ? AT Commands or flash some firmware?
  • Which microcontroller is to use?
  • How can I make it smaller and compack?
  • Resistive or capacitive touch?
  • How to maximize the battery life?
  • How could I make this experimentation a product?

what is the schedule?

  • Week1: Electroincs, Designing and milling PCBs
  • Week2: Interfacing and connectivity
  • Week3: 3D Designing and printing.
  • Week4: Putting all parts together, test and debugging.

how will it be evaluated?

  • Demo will be given showning following features.
  • Displaying questions of EPD display
  • Must be portable.
  • Wifi connectivity.
  • Case with 3D printed and lasercutted casing.


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