PENDULUM is a pair of programs to interface the TI-82 with CBL 

and photometer probe to measure the period of swing of a 

pendulum with a precision near 0.001 second.  With this 

precision, you can, for example, explore the period as a 

function of half-angle of swing.



----begin documentation----

Two programs grouped in PENDULUM.82G.  Use the File Utilities 

of TI-Graph Link to ungroup the program files below.



----Program name: PENDULUM.82P

Main program to:

1) query the user for some initial estimates of the pendulum 

period (used to set the CBL sampling rate);

2) set up the CBL to collect triggered data from the 

photometer probe in Channel 1, 

3) prompt the user to begin data collection;

4) collect the data from the photometer probe (approximately 

500 data pairs);

5) retrieve the data from the CBL (using GETMORE.82p);

6) analyze the data, looking for three dips in the voltage 

data to signal the passing of the pendulum near the photometer 

probe;

7) inform the user if three voltage dips are not detected and 

retstart the program;

8) display the time values of the three voltage dips and 

calculate the pendulum period.



Variables used: L1, L2, L3, L4, L5, A, B, D, I, J, K, P, Q, R, 

S, T