... library for the RWP community ... I guess the software was predicated on everyone having the same robot. The common factor was the same robot brain (68HC11 and InteractiveC with multi-processing). It worked for any two-wheeled bot, with variable speed motors, and encoders. The motors could be a...

@joan and fellow robot enthusiasts: The majority of personal robots are driven by two DC motors. Even two identical model motors will perform slightly different. In addition the wheels may be slightly different diameter, and may have some wobble which causes the wheelbase to vary slightly. These sli...

I am updating my 15 year old robot with a new brain and also adding a tilt/pan mechanism for a Pi camera and an IR range finder. I am interested to have my new robot calibrate its effectors using its sensors. My chassis has 32 stripe wheel encoders which can provide motion detection, max_speed detec...

Anecdotal Datum for pigpiod: I clocked the processor load of pigpiod default (equivalent to -s 5) on my Pi B+ with top. The CPU% varied from 8.2 to 8.5 with 8.2% the most often seen reading. (This is with no pwm, no callbacks, and no clients.) Joan, (the pigpiod creator), suggested the default sampl...

I set up pigpiod to start at boot via the crontab entry: @reboot /usr/local/bin/pigpiod This runs the pigpiod at the default sample rate of 5 uSeconds. With no events, no callbacks, and no clients, pigpiod loads my Raspberry Pi B+ at roughly 9% CPU. The pigpiod docs show possible sample rate options...

Hello robo heads, I've finally decided to get serious about updating the brain of my Rug Warrior Pro robot. There used to be hundreds of Rug Warrior and Rug Warrior Pro (RWP) robots scurrying about for university research, hobbyists, and education. My RWP robot is 15 years old now, and really needs ...

So far the only thing that works is putting an alias in my .bash_aliases: .bash_aliases: alias arecord48='arecord -F s16_LE -r 48000' so that: arecord48 test.wav gets me 48k 16bit Mono recordings. The whole sound system on my Pi B+ just seems a mess: 1) There is a 20-30 second delay the first time I...

Audio Configuration: Output: RaspberryPi B+ headphone jack "hw:0,0" Input: USB microphone "hw:1,0" I have figured out the "split config" /etc/asound.conf to make the onboard bcm2835 chip be the default pcm playback device, and for the USB mic to be the default capture device (working file at end of ...

Perhaps you want to use a semi-colon instead of the ampersand? With a semi-colon the shell waits until the omxplayer completes before executing the "exit" command (which takes the shell and all child processes out of execution). BTW, The user running omxplayer needs to be in the video group. Old but...