[S.R.P.R] – Prototype II Final Report: [Dual Mode Table]





All wheelchairs in the market currently require manual placement and removal of tray tables and this can only be done with the aid of an able assistant; but with  the retractable table complete control would be given to anyone on a wheelchair. With the push of a button a fully automated tray table would setup  in-front of the wheelchair user and after use a push button would remove the table back to its  rest position on the side of the wheelchair.



The retractable table is a fully automated tray table that would be integrated with a wheelchair  and would rest on both sides of a wheelchair. The table is divided  into four sections for portatbility ( left1(L1), left2(L2)) and (Right1(R1),Right2(R2)). R2 would rest on top of R1  and L2 would rest upon L1.  when activated by the push of a soft touch button the  actuators on both sides of the wheelchair would drive  both R1 and L1 forward and as it reaches the desired extension a micro-switch would stop the linear actuator then the servo motor on the right side would flip R2 from the top of R1  and the servo motor on the left side would flip L2 from the top of L1.  After both sides have interlock the entire tray table would then start moving inward towards the user sitting in the wheelchair and as the table approaches the user an infrared sensor would stop the movement of the table from getting too close

Parts used:

  • 2 linear actuator (to extend tray table from rest position)
  • 2 servo motor (to flip the tray table)
  • infrared sensor (to stop the movement of the tray as it approaches the user)
  • composite material(tray would be made out from)
  • resistors
  • micro-switch
  • Arduino
  • Motorsheild
  • Resistors
  • hinges


Below is a circuit diagram of the 

Your report should include functional and circuit diagrams. If you did not provide them in the description, provide them here with explanation


designs changed:

  • One piece table set
  • Table rotating 180 degrees

Future plans:

  • Add USB port to the device  
  • Improve safety of the device 


Questions to consider: What worked about your project? What didn’t work? What would you do differently? Now that you built the project, do you think there was a better way to solve the problem? If you were to expand your project in the future, what would you do next?

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