Project Development
Week 19
Assignment :
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Complete your final project. Track and document your progress.
My Invention :
My project is a wagon that will follow you by using pixi-camera (image processing based on colors) , it will also avoid crashing any obstacle using ultrasonic sensor. The main idea of my project is creating a robot that follows you around which can be used as a cart , personal assistant while working , wagon to transfer many things at the same time without any effort at construction sites and warehouses. I am proud of myself that I gained the knowledge from Fab Lab to make my project. Of course I have many enhancements to make on my project on the structure design to differently use the robot in many useful ways in our daily lives.
What is the deadline? How much time do I have left?
My final project presentation date is 16-June 2017. I have 2 days to finish my project and complete my project presentation slide.
What tasks have been completed, and what tasks remain?
I have completed the CNC machine cutting the wood of the structure of my design. I have also completed testing the DC motors and ultra-sonic sensors on my test structure and they worked fine. Then I CNC cut my final design using wood. Then I tested the components if they work or not by using an arduino board. Then I prepared the schematic design of my electronic board using eaglecad. After that I printed my electronic board on a copper sheet and soldered all of the components I needed.
The tasks remaining are printing vinyl stickers to put on my wooden wagon. Also 3D print a logo of my wagon to fix on my wooden wagon, and probably two hand holders to lift my wagon easily and a holder for my pixi-cam
How will I complete the remaining tasks in time?
1- Structure (Wooden) 2 Days (07/06/2017)
2- Electronics boards 2 Days (09/06/2017)
3- Assembly & Programming 2 Days (11/06/2017)
4- Error fixes and Improvements 1 Day max (13/06/2017)
I saved time by assemblying the wooden structure right after I it was cutted , and tested the dc motors if they work fine or not at the same time also.
What has worked ?
The press-fit of my wooden structure has worked on side with a little bit of manual adjustment , I gave .3 mm tolerance/allowance to holes on my main board, and successfully assembled my wagon. The programming code for the wagon to follow me actually worked especially the right and left turns. DC motor worked.
What hasn't ?
I had some errors in my structure design , I have entered the tolerance/allowance distance in Artcam software after I completed my test design in OnShape for the press fit slots on my main board to be a positive number .5 mm , so the press fit holes became smaller and didn’t fit the other parts of my structure. So I fixed this issue by inserting a positive number -.5 mm and printed the two main boards only and fixed the issue. Then it became to loose, so I cut my final design and gave tolerance -.3mm, So it worked with a little manual adjustment.
And while programming and testing the code for the dc motor , I have made the speed of the dc motor to be 70 which was pretty fast having my wagon crashing and too fast to turn , so I made it slower (25) and increased the difference of speed between the speed of the two dc motors when programming the left and right turning part of the programming code.
What questions still need to be resolved?
- What design will I print the vinyl stickers ?
- What technique is better that makes the wagon stop following me when it is too close ?
What have you learned?
I learned that planning the implementation of any project is probably more important than implementing the project itself. And the programming code of the Pixi-cam which was very interesting and tough at the same time.
