Blogs

Setting up I2S Microphones on the Raspberry Pi 3 for NOOB's

Ray.Edgley's picture
If you are using the Raspberry Pi 3, one of the option is to use I2S (Inter-IC Sound) Micropones
 
This is diferent to I2C which  is for the control of devices and will be covered at a later date.
 
If you haven't already i suggest reading the Installing MRL on a Raspberry Pi3 for NOOB's
http://myrobotlab.org/content/installing-mrl-raspberry-pi-3-noobs
 

Installing MRL on a Raspberry Pi 3 for NOOB's

Ray.Edgley's picture
New Out Of Box (NOOB) is a term used for very new beginners.
We have all been there, and with the alittle help, we learn all the time.
 
This set of instruction is for the new user with very little or no experience with the Raspberry Pi.
Most seasoned experimenters/developers will find these instruction too simple and goes into detail they do not need.
 

moveToBlocking() for scripting

moz4r's picture

It is useful, to wait a finished moveTo() before to launch another. Without using a sleep(x) between 2 actions. because sleep() didn't take care of servo speed .
The magic will worky only if velocity > 0

There are several levels :

1 servo blocking event


Plantoids almost there! $71.00 to go !

DJUltis's picture

Sorry for the shameless plug, my friends, but if I could ever ask for your aid, it is now. 


Desperately seeking ideas re: large build-area, cheapish 2nd 3D printer

Humanoid's picture

It's come to my attention that my excellent Flashforge is not cutting it in the legs department. The build area is just too small for legs and other larger projects I'm contemplating. 

I don't want to spend mega-bucks on a second printer at this stage.  

Can anyone please suggest/warn about any 3D printers they've used with large build areas? I would like a fairly reliable one with a build area around 280mm/300mm cubed or larger. Preferably with a heated build plate. One extruder is okay.


Why this bot no worky? (Been away again)

Humanoid's picture

I have tried to run this chatbot on Windows with Chrome (no inMoov connected). I duplicated the Alice2 bot file and called it "ghostchat". When run this in MRL it opened webgui but threw an error. I modified nothing in the swinggui. Should I have? Everything looks different in there to what it used to when I last used it.


Fred InMoov

Ray.Edgley's picture

Fred InMoov is built using two Raspberry Pi 3 with a planned third one to be installed.

Servo Control is done using a PCA9685 Servo Driver in the form of a raspberry Pi Hat from Adafruit Industries located on the top of top moths RPi named Fred_1, This is then conneted to 3 other PCA9685 Servo Driver as stand alone boards, one located on the back, and one in each bicep.

Located in each forearm is a ADS1115_16B_4CH_I2C_ADC again from adafruit industries. This allows for 4 of the 5 finger pressure sensors to be monitored.


MrlComm and the importance of Auto-generated Code

GroG's picture

Ahoy !

When you have maintain the same message structures with different languages, it sometimes is advantageous to GENERATE CODE ! rather than write it.

MrlComm has messages we want to be encoded and decoded in both Java & Arduino C++, and perhaps more languages or encodings.

So we make "One Document To Control It All" -> arduinoMsgs.schema


Raspberry PI + OpenCV on latest

kwatters's picture

So, it seems like the upgrade of OpenCV to version 1.3 has busted the OpenCVFrameGrabber on the RasPI3.  Where, I don't have a fix for this issue yet, I do have a work around for the problem.  Here's the steps to get OpenCV working on the RasPI3 on the latest build  (until we sort the javacv 1.3 issue.)