Chapter 7. Experiment 7: It’s Chronophotonic!
This experiment will make use of the information from previous experiments relating to transistors, phototransistors, 555 timers, and comparators. Yes, there was a good reason for laying all that groundwork: you will now be able to utilize that knowledge to build a gadget that has a practical application. Moreover, there will be a bonus: the fun of cracking open a digital alarm clock, figuring out how it works, and repurposing it.
A slightly different and much shorter version of the project was published in Make magazine, where I had to omit a lot of explanations for reasons of space. This new version contains several improvements, is much more detailed, should be easier to understand, and will work ...
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