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Tachometer

Tachometer. -=. 4 Simple Commands. Lcd_putsf (“ Eclub welcomes u ”); // prints constant string Lcd_putchar (‘a’); // character to be printed Lcd_puts (c); // c is a variable string. What about integers ?. Convert Integer to strings Use two simple Commands

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Tachometer

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  1. Tachometer

  2. -=

  3. 4 Simple Commands • Lcd_putsf(“Eclub welcomes u ”); // prints constant string • Lcd_putchar(‘a’); // character to be printed • Lcd_puts(c); // c is a variable string

  4. What about integers ?

  5. Convert Integer to strings • Use two simple Commands • Itoa(i,c) & ftoa(f,3,c)

  6. Using Itoa

  7. Result

  8. Using ftoa

  9. Result

  10. Using LCD in CVCAVR

  11. Select any Port • Use the 4 magical Functions

  12. Triggered externally • Not at regular intervals of time

  13. So Now we are able to know when the obstacle attached to the shaft comes in way • Able to display on LCD

  14. What remains ? • Calculate time at which external interrupt occurs • HOW ???

  15. HINT • Use one more Internal interrupt to get time

  16. TSOP frequency 38 Khz and frequency of IR= 405 THz (10^12) - 300 GHz (10^9) . So 38 khz is frequency is Blinking frequency

  17. Pit Falls Pit Falls • Internal Interrupts functions call themselves after specific intervals of time . Its not like C Programming that to use a function you need to call it in main program .But here time calls the function itself after time interval set by you . You need to mention anything inside main function to call interrupt after specific interval of time • Declare variables global if declaring them inside main block results in error

  18. Downloading the Software • Components distribution (When and where ) • Prelims (when , where & what to show )

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