Converting an electronic calculator into a combination stopwatch-calculator |
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| Authors: | Allen H. Wolach Peter Roccaforte Sylvia N. Van Berschot Maureen A. McHale |
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| Affiliation: | 1. Department of Psychology, Illinois Institute of Technology, 60616, Chicago, Illinois
2. Northwestern State University of Louisiana, 71457, Natchitoches, Louisana
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| Abstract: | A method for adding electronic stopwatch capabilities to a calculator is described. An integrated circuit (NE555) is used for a time base. The circuit drives an opto-isolator or light-emitting diode that operates a photocell. The opto-isolator or photocell substitutes for a switch closure to increment the calculator in .10-sec intervals. |
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