Blogs

PID Loops

Ray.Edgley's picture

Proportional, Integral and Derivative or PID control systems have been around for a very long time, but they are still not very well understood.

Recently I convinced Fred to give a bit of a talk on the subject.
Good thing with robots, is convincingthem is just a case of programming them :-)

Here is the video of Fred's presentation.

https://youtu.be/KzrUz0WBopw


"Peri-Scope up" - FNIRSI-1013D Portable Oscilloscope 100Mhz(!!)

Gareth's picture

I just bought one of these, thought I would bring to your attention :-

Best part ..... its circa 120$ delivered including two x1/x10 probes ..

(-: bonus for me was that the customs elves were on coffee break :-)

In a nut shell its a Dual channel 100Mhz with 7" colour touch screen.

The performance drops off the more you lean over 80Mhz. (100Mhz is bit tongue in cheek, however how often do we need to measure so high)


Walking Robots Series.

Ray.Edgley's picture
Going back a year or two ago, I post a couple of blogs on the then current state of walking Robots progress out in the community.
At the time, The most advanced, as in it walked was John Stagers robot.


Using Mimicspeech on the Raspberry Pi

Ray.Edgley's picture
Before we can use Mimic speech with MyRobotLab on the Raspberry Pi, we first need to install it.
The compiled executable is installed with MRL for windows, but not for the ARM based linux install used on the Raspberry Pi.

PUBLISH_MRL_COMM_BEGIN vs DisablingAutoResetOnSerialConnection

GroG's picture

Ahoy !..

I was rather dismayed when I saw my Mega attach with an Arduino service and I got a endless
error 


Lil' Nightmare

GroG's picture

Saw Ray post this - to me looks like a nice mini Boston Dynamics Nightmare ... very nice


Walking robot series

mhaskell's picture

This is an interesting series about designing a walking robot. https://www.youtube.com/playlist?list=PLpwJoq86vov-C5SldDA-AhxesVHPRk74x  most of this is above my head, but might be useful to Ray in his newest challenge.


RasPi UI Proposal

GroG's picture

Here's a quick mock-up of the RasPi service UI.
Having a pin out reference I always find useful ...  can prevent blue smoke sometimes :)
Alexinator40 and Ray have been suggesting a generalized I2C interface.  I think components from the Serial service can provide a UI which allows for generalized reads and writes to devices on an I2C bus.
The buttons on the right would be just to read and write GPIO pins..


Motors Refactor

GroG's picture

Ahoy !

Now with OpenCV stuff merged on the develop branch - the branch I'm working with is closer to develop.
The largest amount of change on it that is different has to do with Motors and MotorControllers.

Motors in the past always required a direct reference to a controller.  

I don't think this is a very good design.