HP Forum Archive 19

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HP 50 as a stop watch. Message #1 Posted by Stuart Sprott on 9 Sept 2009, 8:05 a.m. Hi, I wish to use the HP50 as a stop watch to time road runners in a race. It should not be difficult to program to do this. The only problem is that the calculator can go to sleep if there is a big gap between runners. This means that you could miss time a runner. I have searched for a internal flag that might control the calculator sleeping, but I have had no success. Does anyone know how to stop the HP from sleeping during a race?

Re: HP 50 as a stop watch. Message #2 Posted by Nacho on 9 Sept 2009, 8:19 a.m., in response to message #1 by Stuart Sprott have you tried with the internal variable TOFF?? you can define an idle time before variable STARTOFF is executed. Remember 1second = 8192 TICKS Regards Edited: 9 Sept 2009, 8:20 a.m.

Re: HP 50 as a stop watch. Message #3 Posted by Stuart Sprott on 9 Sept 2009, 11:45 p.m., in response to message #2 by Nacho I must be missing something. I have tried TOFF just by keying it in but get no response. If I do a seach in the electronic manual on TOFF nothing comes up. How do you get access to this command? The variable STARTOFF is one of your variables?

Re: HP 50 as a stop watch. Message #4 Posted by Tim Wessman on 10 Sept 2009, 12:31 a.m., in response to message #3 by Stuart Sprott Store a hexadecimal number as TOFF in HOME. It represents tics (8192/sec) So #8192d * 60 * min will set a new off time. As for a stopwatch, look here: http://www.software49g.gmxhome.de/EnglishSeite01.htm#SWC TW

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