Agenda:
–Parallelism pop quiz
–Find the source (see below)
–Coffeehouse 4 discussion
–RAB: Q and A
–In class work
Homework due Tuesday, Nov 7:
1–Post Coffeehouse #5 by class time: A draft of both your second and third annotations. Make sure to use numbers for each part.
Who wrote this?
As I’ve said before, my robots are all working and great. They take time so consider fuses and circuits, especially note that according to David Cook’s Robot Building for Beginners “another place to consider a fuse or circuit breaker is on the robot itself. The portions of the circuit with regulated power go through a voltage regulator chip. So, check their datasheets to make sure your regulator chips have built-in thermal and current overload mechanisms (most do).” Don’t forget, as Cook states, “for circuits on the robot that connect directly to the battery, such as the motors, use a fuse or circuit breaker to prevent damage or fire. PPTC (Polymeric Positive Temperature Coefficient) switches . . . resist power flow when overheated by too much current.” What happened to me and might happen to you is that, as Cook continues, “a few seconds after the fault is corrected, they cool down and automatically reconnect the power. They’re lightweight, inexpensive, and can be placed deep within a robot since the user doesn’t need to press a button to reset the circuit breaker” (29). The main reason that I’m leaning so heavily on David Cook is because the importance of switches cannot be overstated. And the overheating issue is super important. Please pay attention to selecting the right switch, or else.
Cook, David. Robot Building for Beginners. 2nd ed. 2010., Apress, 2010, https://doi.org/10.1007/978-1-4302-2749-6.