Page 138 - Build Your Own Quadcopter_ Power Up Your Designs with the Parallax Elev-8

Chapter 5: Quadcopter Propulsors 117

Figure 5.28 Characteristic motor graphs from the xcopterCalc website.

temperature is not predicted to rise too appreciably even when operating above the
manufacturers recommendations. However, I am not convinced that it will remain cool if
operating in the extreme regions.
This last section concludes my regular discussion on the quadcoptor propulsion
components. What follows is a detailed program analysis of the ESC_Motor_Control_Demo
program that was used in the experiment. It is presented for those readers who are obviously
interested in such an analysis and who might want to use this program as a template for
further experiments, and perhaps, a future flight-control program. The discussion also
explores one Propeller Assembly Language (PASM) routine because it is used in the demo
program. Finally, I delve into a brief C language discussion in which I demonstrate how a
simple Propeller C Language routine can replace the somewhat obtuse PASM routine. Those
readers not interested in such minutia can skip the following sections without fear of losing
any continuity in the overall discussions.
ESC_Motor_Control_Demo Analysis
This analysis begins with the code listing. The program was made available on Parallax’s
Propeller forum, which is a very valuable resource of expert knowledge. Members of the
forum can answer just about any of your questions regarding the Propeller chip, or even the
Elev-8 for that matter.

‘‘ Single_Servo_Assembly
‘‘ Author: Gavin Garner
‘‘ November 17, 2008
‘‘ See end of file for original comments
‘─────────────────────────────────────────────────’
‘ Modifications by Cluso99.