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Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 00:50, 3 February 2011
, 00:50, 3 February 2011→Bicycle trip computer
The magnet is mounted on the wheel and the Hall effect sensor senses its magnetic field once a revolution. The program waits in action1 until the magnet arrives, and a voltage of >2.6V is sensed, it then waits in action2 till the magnet has passed, <2.5V. The current time in seconds is stored in box1. The program then waits for the magnet to arrive and pass. The wheel circumference, 2.1m is divided by the elapsed time (current time-box1) and the result is printed.
The magnet is mounted on the wheel and the Hall effect sensor senses its magnetic field once a revolution. The program waits in action1 until the magnet arrives, and a voltage of >2.6V is sensed, it then waits in action2 till the magnet has passed, <2.5V. The current time in seconds is stored in box1. The program then waits for the magnet to arrive and pass. The wheel circumference, 2.1m is divided by the elapsed time (current time-box1) and the result is printed.
Reliable operation is dependant on the alignment of the magnet and sensor and the upper and lower voltage setpoints. The program will operate faster if the blocks are hidden.
[[File:Turtle Art Activity tripcomputer.doc]]
[[File:Turtle Art Activity tripcomputer.doc]] propject as doc
Challenges
* large full screen display
* average speed
* total distance
* maximum speed
* clock and stopwatch
==Links==
==Links==