ECE 002 Robots and Sensors

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ECE 002Robots and Sensors

• Group 14

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Objectives

• Research sensors and their usefulness to analyze
  data
• Design more advanced robot from last semester
• Gain a better understanding of MATLAB and
  functions

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Parts List
Light Sensors X2
The Handyboard
Motors X2
Legos!
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The Code

• void main()
• int flag0
• while(!start_button()) // Wait until start
  button is pressed
• while(flag0) // Continue infinitely
• if((analog(2)lt240) analog(4)lt240) //
  If both sensors read less than 240
• motor(1,100) // Motor 1 forward at
  100
• motor(3,100) // Motor 3 forward at 100
• flag0 // Flag still equals 0
• else if ((analog(2)gt240)
  (analog(4)gt240)) // If both sensors are gt 240
• ao() // Turn off both motors
• flag1 // Flag equals 1, exiting while loop
• else if ((analog(2)gt240)
  (analog(4)lt240)) / If sensor 2 is greater than
• 240 and sensor 4 is less than

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Sensor and Program Outline

• Light sensors differentiated between light and
  dark
• Handyboard analyzed data and made decision
  whether or not to turn
• Followed S-curve to end finish
• At finish, both light sensors were on dark line,
  robot turned off

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Design Process

• Program and design team
• No prototype robot
• Small test programs to test threshold and motor
  speed
• Full program came from test programs

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Sensors

• Sensors tested for best one
• Light sensor was better at differentiating light
  and dark
• Made it easy to set threshold and let robot know
  when to turn

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MATLAB

• Learned how to incorporate functions into
  programs
• Used trapez and trapez_fast
• Trapez_fast was faster because it used vector
  operations in MATLAB
• Functions used to find and plot data points for
  integral of sin(x)

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MATLAB Graphs

• Sin(x)- blue
• Integral sin(x)- red
• Shows how functions can be used and then graphed
  in MATLAB

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Conclusions

• Sensors can be used to collect data but some are
  better at different functions
• The robot helped reinforce our programming,
  building, and teamwork skills
• MATLAB is a great tool to use to analyze data
  quickly