TI-84 Plus CE: Stopwatch and Countdown Timer
A clock in the TI-84 Plus?
It is common knowledge that the TI-84 Plus allows you to set the time and date. What may not be so common is that the TI-84 Plus has two functions that you can use to time projects.
startTmr: starts the TI-84’s timer. A time code, in a form of a real number, will be returned. For example, 476286143. For future calculations, store the result in a variable.
checkTmr(time code): Uses the TI-84’s internal clock to determine how many seconds passed since the given time code.
startTmr → T
These commands are only found in the Catalog ([2nd] [ 0 ]).
Here are two basic programs that use these functions: basic stopwatch (STOPWTCH) and countdown timer (TIMER).
STOPWTCH: Stopwatch for one event
TIMER: Count down timer from a given number of seconds, up to 999,999 seconds (277.7775 hours or just over 11 ½ days).
TI-84 Plus CE Program STOPWTCH
Output(2,1,"PRESS ENTER TO STOP")
TI-84 Plus CE: TIMER
Input "NO. SECONDS:",N
Note: I tried several methods to display the timer while the seconds are counting down. It wasn't enough just have Output(3,1,R) because after 10 seconds, the display would read: 10, 19, 18... Having ClrHome before Output(3,1,R) would make the time flicker too much.
Pretty basic. This should work with any version of the TI-84 Plus since they have an internal clock. The TI-83 and the TI-83 Plus do not internal clocks.
P.S. Any one purchased the white or gold limited edition TI-84 Plus CE yet? I'm thinking about getting a gold one.
This blog is property of Edward Shore, 2016.