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Speedometer using AVR!? Answered

im using avr atmega 8 and i need to display the speed in a lcd panel!.How would i convert the data from the hall-effect sensor to digital and from there to numerical value..Im confused about the caliberation.

2 Replies

steveastrouk (author)2012-04-07

What are you writing the code in ?

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iceng (author)2012-04-06

The hall will give you a time measured in execution cycle counts for
a measure of speed.

Then use the count through a look-up table to send RS232 numerical characters to a simple LCDisplay.

Or calculate the speed.

Calibration can be serious but in the end trial-and-error will win the day.
And that is assuming the hall response is linear compared to speed.


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