RoboSavvy Forum

Been working with some new Gyro's

2007-02-03T12:21:12+01:00

try the hyperion 6 or 8 ch reciever from rotobirds in the uk. very dinki and very good for small electric helis.

Statistics: Posted by robbybot — Sat Feb 03, 2007 12:21 pm

Been working with some new Gyro's

2007-02-02T17:45:34+01:00

We went thru the previous postings on this subject and the wiki is quite helpful
But the E-Flight G90 series gyros have the ability to go from a head hold setting to a standard rate mode
If we can get the standard rate mode to work on Robonova we can then take the secondary signal lead and plug it into an RC receiver
This secondary signal lead will give us the ability to set the gain without opening him up and tweaking the pot screw
This would give us real time on the fly gyro gain adjustment
And they are very small being about 2/3 the size of the GWS models
That is why we wanted to try it
Just to see if it can be done
At this point he thinks he's downhill skiing
Curious if we have the code right, gonna check it again later today
And check the different settings for the KHS models also
Having some trouble locating a mini sized RC receiver small enough to fit into his chest cavity and have a minimum of 6 servo outputs
But we will worry bout this after we get these working
You guys might be right, and we could be screwed from the get go
But at least we tried
Damn this is fun!!!!
Widgits

Statistics: Posted by Widgits — Fri Feb 02, 2007 5:45 pm

Been working with some new Gyro's

2007-02-01T17:28:43+01:00

The Robonova expects to see A gyro output proportional to angular velocity. This is the normal Gyro mode. Heading hold Gyros integrate the gyro output to give an output proportional to relative angular positon which is not what you want.

It is not only the above mode that matters on the RoboNova. Most gyros give an an output pulse which is the input pulse +/- the gryo value. In the Robonova the input pulse length is fixed. In RC applications the output and the input pulse are asynchronous (input from receiver, output to servo so relative timing does not matter. In the Robonova the same routine is used to both create the input pulse and read the output pulse. This means the relative position of the input pulse and output pulse now matters, and this does differ between Gyro manufacturers. This is why the Gryo settings differ for KRG-1 and GWS-3 Gyros, the relative timing is different.

So use normal mode, try both KRG and GWS settings, you may be lucky.

Statistics: Posted by i-Bot — Thu Feb 01, 2007 5:28 pm

headlock gyros

2007-02-01T17:18:39+01:00

Guys: you should check the gyro thread before you go through reinventing the wheel, the PG-03 gyros will fit inside RN-!'s shoulders the output at AD 0, AD 1, is returned to AD 4, AD 5, as FB and LR in the gyrohelp.bas download. I think the guys who tried headlock gyros gave up on them. the PG-03 gyros are not that $,or hard to modify so they run without thier cases and soldering the output wiring to the boards will give tyou some practice for when you shorten the other servo leads to clean up the rats nest Hitec gave us to work with. With that out of the way AD 3, AD 4, can be used for x and y axis from an accelerometer.I'm still learning about this, and with so many more mods to try and do.good luck.

Statistics: Posted by engineer — Thu Feb 01, 2007 5:18 pm

Been working with some new Gyro's

2007-02-01T16:09:13+01:00

i might be wrong, but i think you need to stick with 'vanilla' gyros.

this is a very rough description as i remember it from my heli: a vanilla gyro simply counteracts the unwanted movement, but a heading hold gyro keeps compensating until the original state is 'true' again - so you'll probably find the servos going mad.

I have a heading gyro kicking around - i should try it for myself and see

Statistics: Posted by plingboot — Thu Feb 01, 2007 4:09 pm

Been working with some new Gyro's

2007-02-01T02:54:44+01:00

Little Ricky and I have been playing around with some new E-Flight gyro's
We haven't got them working yet but we are having fun trying
These are the E-Flight G90 series
Still wondering about the difference between head hold vs standard rate settings for these

Have been spending some time backreading past postings with code to make this system work
Will keep all of you informed of the results

Having so much fun working on the Robonova with my 12 year old son
It is so good to be passing some of my skills of building autonomous robotics down to him

This Robonova unit is a awesome training tool for this
And I have to say "THANK YOU" to all of the members from this group for helping me to achieve the goal of teaching my boy the field of Robotics
I have a robotic manipulator that I designed and machined 20 years ago for doing underwater welding for the NAVY
Maybe this is what has my boy so captured

It is great to see people helping each other for the same educational gain
related to building robotics and their programming

And I still don't know why I call him "Little Ricky"
For he is about 6 ft tall and weighs 210 Lbs. pretty big for a 12 year old
(You dont think the mailman came around do you?)
I'm joking of course, He looks just like me only much bigger!!!
Yeah I'm beginning to worry bout pissing him off
He has 25 Lbs on me

Thanks again
Widgits

Statistics: Posted by Widgits — Thu Feb 01, 2007 2:54 am