Differences

This shows you the differences between two versions of the page.

--- embedded:adventures:rcservo [2016/09/25 13:49] – [mBed RC Servomotor Control] pvela
+++ embedded:adventures:rcservo [2024/08/20 21:38] (current) – external edit 127.0.0.1
@@ Line 4: / Line 4: @@
 Most of the modern embedded controller programming IDEs now have a library for performing this task.  That makes it super easy to control servo-motors, unless you want to control more than the chip can provide (in terms of PWM/PPM signal lines).  In that case, specialized methods are needed to enhance the functionality of the microprocessor to do more than the libraries are coded to do. Essentially, you'd be coding up your own library.
+Part of getting these servo-motors to work involves calibration. Even though they can be commanded, the problem is that each microcontroller and programming interface has its own numerical range for the command specification.  Furthermore, it doesn't always align with the angular range of the servomotor itself.  Thus, there needs to be a step that measures the angles associated to different command values across the legal range, then fits a line to the data acting as though the angle were the input and the associated command value were the output.  A serviceable example of this is the [[ece4560:piktul:calibrate|calibration interface for the piktul robot]].
 ==== Arduino RC Servomotor Control ====
@@ Line 17: / Line 20: @@
 Controlling a servo via the mBed requires you to
   * Write code like that shown below to control it via internal and/or external input - see below for example code
-  * Use an optoisolator chip to eliminate signal problems due to the differences in the voltage level from the mBed (3.3V) and the power supply (likely around 5.0V) - see the [embedded:adventures:dualpower|Bridging Power Supplies page] for information
+  * Use an optoisolator chip to eliminate signal problems due to the differences in the voltage level from the mBed (3.3V) and the power supply (likely around 5.0V) - see the [[embedded:adventures:dualpower|Bridging Power Supplies page]] for information
 {{:embedded:adventures:screen_shot_2016-03-01_at_12.31.06_pm.png?600|}}