PHOTORESISTOR ALGORITHMS - The Diigo Meta page

• 14 Jun 07
  

  York Jong

  LDR algorithm light photocell photoconductor photoresistor photovore robot sensor

  • 

  • pseudocode: 

      read left_photoresistor 
    read right_photoresistor 

    if left_photoresistor detects more light than right_photoresistor 
    then turn robot left 

    if right_photoresistor detects more light than left_photoresistor 
    then turn robot right 

    if right_photoresistor detects about the same as left_photoresistor 
    then robot goes straight 

    loop

  • Photovore Algorithm, Improved 
    This algorithm does the same as the original, but instead of case-based it works under a more advanced Fuzzy Logic control algorithm. Your robot will no longer just have the three modes of turn left, turn right, and go forward. Instead will have commands like 'turn left by 10 degrees' or 'turn right really fast', and with no additional lines of code!  

     pseudocode: 

      read left_photoresistor 
    read right_photoresistor 

    left_motor = (left_photoresistor - right_photoresistor) * arbitrary_constant 
    right_motor = (right_photoresistor - left_photoresistor) * arbitrary_constant 

    loop

  • Photovore, Split Brain Approach 
    This algorithm works without comparison of photoresistor values. Instead, just command the right motor based on light from the right sensor, and the left motor with only data from the left sensor.  

       

     You can also get interesting variations by reversing the sensors for a cross-brain algorithm.  

     pseudocode: 

      read left_photoresistor 
    read right_photoresistor 

    move left_wheel_speed = left_photoresistor * arbitrary_constant 
    move right_wheel_speed = right_photoresistor * arbitrary_constant 

    loop

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