April 2014
Beginner to intermediate
392 pages
14h 57m
English
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 ...