Week Two

 

Week Two Progress:

In this session we continued work on the metal detecting circuit. This involved lots of research on which type of metal detecting circuit to use and how to make the coil strong enough to detect metal objects beneath it. We decided to use a pulse generating circuit rather than a low frequency type circuit since... We also made progress with writing the metal detector code for the arduino so that it could interpret information it was gathering from the metal detecting coil.

We started work on the chassis design. A decision needed to be made on whether to use 3D printing or simple laser cutting for the bulk of the chassis. The chassis has some basic requiremtns. It needs to have enough space for all of the components as well as a way to attach the components to the chassis. There also needs to be enough space between the front and back pair of wheels as well as amount of clearance between the bottom of the robot and the surface that its driving on, so that it can drive over other small objects/obsticles. We decided that laser cutting would be appropiate for the chassis design that we wanted.

We also improved the robot driving code, now introducing the ultrasonic sensor so that the robot can also avoid objects.

Example of driving anf sensor circuit on a breadboard [1]

Problems/ Concerns:

Getting the metal detecting circuit to be strong enough is proving to be more difficult and time consuming than initially planned. We're considering ordering a designated module for the metal detection part of the car so that we have time to make a working protoype of the car. Wer continue to work on metal detector coil prototypes in the meantime. 


Plan for Week Three:

We should have the metal detector circuit design finished and the chassis design completed and ready for printing.The driving code is pretty much finished and just needs to be polished next week.


References: 

[1] A. Abdul Jabbaar. (2019, Sep. 17). Ultrasonic Sensor HC-SR04 with Arduino Tutorial [Online]. Available: https://create.arduino.cc/projecthub/abdularbi17/ultrasonic-sensor-hc-sr04-with-arduino-tutorial-327ff6

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  Week Three Progress: A lot of time this week was spent trying to find ways to make the metal detector more sensitive. There were two main ways; increasing the number of turns in the coil, or increasing the current in the coil. For the time being, we decided to focus on increasing the turns in the wire as it was more accessible. We made many different coils so that we could test them and find out which would work best.  This week, we also made a basic chassis design for robot. It included holes so that the different componentsw of the robot could be attached to the chassis as well as a couple pieces that allow the front pair of wheels to be attached.    Problems/ Concerns:  Having a strong enough metal detecting circuit is a concern for the lab inspection day. We need to find a way to mount the actual coil to the chassis.  Plan for Week Four:  By the end of next week, we need to have a fully functional metal detecting robot. This means that the metal ...
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