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Activities/Turtle Art/Uso de Tortuga Arte Sensores (view source)
Revision as of 22:24, 8 March 2011
, 22:24, 8 March 2011→Hall Effect Sensor
La lectura máxima no se encuentra en el horizontal, salvo en el ecuador. Mientras más cerca esté del polo, más tiene que inclinar. ¿Por qué? ¿Por qué las agujas de las brújulas todavía del nivel del punto?
La lectura máxima no se encuentra en el horizontal, salvo en el ecuador. Mientras más cerca esté del polo, más tiene que inclinar. ¿Por qué? ¿Por qué las agujas de las brújulas todavía del nivel del punto?
===Bicycle trip computer===
Tripcomputer.jpg
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 again. 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. What is the maximum speed that can be reliably measured? What happens to the display at faster speeds?
Tripcomputerta.jpg
File:Turtle Art Activity tripcomputer.doc project as doc
Challenges
* large full screen display
* average speed
* total distance
* maximum speed
* clock and stopwatch
The Hall effect sensor costs $6, a cheaper option might be a reed switch $2 [6]
==Enlaces==
==Enlaces==