8 SERVO 04.2014
Q. I have a RoboBuilder Huno that has worked flawlessly for quite a while now. Recently, it just stopped working! When I turn it on and press the
red center button, it starts blinking the Error light and
nothing else happens. I know that the battery is charged
and has the right voltage. I’ve connected it up and it can
talk to the PC just fine. Can you tell me how to find the
A. It sounds like your controller is working at least well enough to talk to the computer, so let’s try
the RoboBuilder troubleshooting tools.
Launch the RoboBuilder Download
Tool and connect it to your
RoboBuilder controller. Click on the
Diagnostic Tool tab near the top left
of the program window. Then, click
on the tab labeled “ 2. Check
wCK(SAM).” You should see your
Huno robot with all of its servos
labeled on the left side of the
program window. At the bottom of
the program window, you will see the
servos listed from lowest to highest,
repeatedly (see Figure 1). I am willing
to bet that at least one of the Huno
servos fail. This means that your
program — expecting the 16 Huno
servos — won’t let the program run.
When the RoboBuilder controller can’t find all of the
servos that it expects for its motion files, it refuses to
control any of them. My guess is that the creators of the
RoboBuilder controller tried to avoid harm by preventing
any servo from going rogue, in case more than one servo
has the same address.
I tested this theory out by snipping one wire of a cable
going to an arm servo (Figure 2). Sure enough, servo 15 is
by Dennis Clark
Our resident expert on all things robotic is merely an email away.
Tap into the sum of allhumanknowledgeand get your questions answered here! From software algorithms to material selection, Mr. Roboto strives to meet you where you are — and what more would you expect from a complex service droid? Post comments on this article at www.servomagazine.com/ index.php/magazine/article/ april2014_MrRoboto.
Ask Mr. Roboto
hen it comes to robots that run around
outside, we tend to prefer wheels to legs for
motivation (Boston Dynamics excepted). Indoor
walking robots should have the edge dealing
with human navigable spaces (iRobot Roomba excepted).
Except for robotic trains, planes, and automobiles, my
personal feelings are that walking robots are the wave of the
future. Plus, I just think they are way cooler than their rolling
brethren! This month, I have some questions about walking
robots; bipedal walking robots, in fact. Technology marches
on, and we hobbyists don't want to be left behind.
Unfortunately, the more complex our projects, the more
difficult it gets to troubleshoot them when something goes
wrong as this month's readers can attest to ...