Raspberry Pi Forums

amcdonley

The problem space is huge, and OpenCV is *THE* solution. We need to grow the number of people that understand how to apply OpenCV functions to basic vision problems.

There are no vision "components" yet, only tools for folks to build with.

amcdonley

My RPi3 robot is powered by six 5000mAH Ni-MH C-cells, and a Tenergy 1025 Smart Charger. Last weekend, when I plugged my bot in to recharge, the charger blinked "bad battery" condition. Two of the (year old) Tenergy C-cells were at 0 volts, while the other four cells read 1.1 volts. I had some three...

amcdonley

What is the meaning/reason for the (45) in the "vcgencmd measure_clock arm" result?

frequency(45)=1200000000

amcdonley

Did you try their sample program ?? sudo apt-get install python-serial Then copy the following into an executable file and run it. #!/usr/bin/python import serial ser = serial.Serial('/dev/ttyAMA0', 38400, timeout=1) try: while 1: response = ser.readline() z = response.split(",") if len(z)>=2: print...

amcdonley

Anyone integrated the new Dexter Industries laser "Distance Sensor" or the Adafruit VL53L0X Time-of-flight sensor to their robot? They both contain the VL53L0X laser "time of flight" sensor and interface via I2C. The "laser" beam and sensor acceptance cones are quite large so it will be interesting ...

amcdonley

Thanks for the heads up on einsteinathome.org - I added to my deskPi3 projects. I have been a part of SETI@Home since it started in 1999 and then WorldCommunityGrid. I just don't like having my computers powered off - weird but me. I have BOINC configured for 5GB disk, 80% of memory 70% of CPU time ...

amcdonley

What do your ultrasonic distance scans look like? Do you get wide variations in distance readings? Here is my "sample=30" run of us_servo_scan.py , (from GoPiGo), when placed 60 cm looking at a corner: tMap: ----------------------------------------------------------------------------------------- | ...

amcdonley

mattmiller wrote:You might want to consider using ArUco type markers to assist with its situational awareness

Wow - so cool. Thanks.

The markermapper from the same folks puts it all together. I am so pumped. I just need to retire, right now, to have the time to play with all this!

amcdonley

Lately I've been doing a lot of thinking about how best to raise my robot's intelligence level beyond basic motor skills. The need for this stems from my desire for the robot to be able to find its way back to a recharging station, to enable a more continuous robot "life" cycle. With the Pi3 process...

amcdonley

This is a very apropos question for what I am doing - attempting to convert a robot written in Interactive C (on 68HC11) to Python (on Raspian Jessie). Interactive C had concepts of light weight "processes" and shared memory (even persistent across reboot shared memory) with hardware interrupts. I a...

amcdonley

Then here is main(): def main(): startup() #prints some instructions. while True: print("Auto mode = ", AUTO) if AUTO == 1: auto_mode() elif AUTO == 0: print("auto mode is off") sleep(1) else: sys.exit() # just for testing purposes And here is auto_mode(): def auto_mode(): print("led loop") green.o...

amcdonley

Suggest restart and do the auto on/off tutorial at http://webiopi.trouch.com/Tutorial_Basis.html and the follow up tutorial on a web page to change the on/off times. When you fully understand that last one, you will be on the path. The reason you may be getting stuck is a basic architecture problem ...

amcdonley

I don't know exactly to accomplish this, but one way might be to have the On button "touch autonomous.on", and launch a "do_autonomous.py&" command. The do_autonomous.py could check for the presence of the autonomous.on file in its main loop or a dedicated periodic thread. When the file is not found...

amcdonley

Absolutely cool. Some concepts to consider:

*Non-Autonomous mode timeout - no input from "web page" in x minutes, enter autonomous mode
*Any input from web page exits Autonomous mode (stop all motion, center sensor platform)

amcdonley

I'm contemplating creating an egret or heron inspired model for my robot. General flow: egret(): loop until "tired*": (Look straight ahead) loop until "tired of standing here": "think about something" how far is path forward clear*? if path not clear, turn to new direction else: move "forward some"...

amcdonley

Anyone know why the VoiceKit is a custom Raspian build?

Was it a rights issue, technical deficiency, NIH aversion, ??

amcdonley

I guess in this day of self documenting code, agile development, and cloud APIs, the concept of a top level design document is passe. Anyone diagrammed the modules, control flow, data flow? Any diagrams of what Google APIs are called, what they do and how? Google appears to have solved the audio iss...

amcdonley

KnarfB wrote:
hth Frank

For sure - thank you!

amcdonley

I want to use my Pi Camera to generate average light intensity values for left of center and right of center, which will be used to drive light seeking / light avoidance behavior in my Rug Warrior Pi robot (Braitenburg Vehicles 2a, 2b) I am guessing this is quite elementary using OpenCV. Any tutoria...

amcdonley

Is there a way to instantiate a PyAudio object that will not have a 20 second delay trying PulseAudio and Jack Audio before succeeding? This is my program: #!/usr/bin/python # # tone.py play a tone on raspberry pi # import myPyLib # get control-C handler import time import math import pyaudio from n...

amcdonley

Solved the mystery - on my jessie-lite there is no .asoundrc in ~pi, but there was in the full jessie Pi3. After I deleted the .asoundrc the default command, arecord -d 1 test.wav succeeds. Not sure if this is a difference between jessie-lite and the full jessie or at some point I deleted the file f...

amcdonley

What else is involved in the pipeline?

amcdonley

I have two Pi3B configured for split audio - analog hardware playback, USB mic capture. aplay defaults to hw0,0 on both Pi3B just fine. arecord defaults to hw1,0 on one Pi3B correctly, but on the newer one I get: arecord -d 1 test.wav arecord: main:722: audio open error: No such file or directory no...

amcdonley

Might I ask for a link to what "motion" is?

amcdonley

I have been using a threading lock in communications where multiple threads talk to SPI to clear up occasional barfing. Read or write functions grab the lock, open spi, perform the read or write, then close and release the lock. spi_lock=threading.Lock() def readx(): values=None with spi_lock: spi.o...

Search found 184 matches

Re: Object and Feature Recognition

Robot Life on Ni-MH Batteries

frequency(45)?

Re: RPICT3 Temperature and Current Sensor

Laser Ranging Sensor (VL53L0X)

Re: Distributed Computing for BOINC

What does your Ultrasonic Scan look like?

Re: Using PiCam for situation awareness

Using PiCam for situation awareness

Re: Threads vs processes

Re: Selecting Autonomous and Manual Control

Re: Selecting Autonomous and Manual Control

Re: Selecting Autonomous and Manual Control

Re: Selecting Autonomous and Manual Control

Egret-Heron Inspired Robot Mobility

Custom Raspian Build?

Documentation for "old timers"?

Re: Left/Right Light Intensity from Pi Camera

Left/Right Light Intensity from Pi Camera

pyaudio object instantiation delay

Solved: arecord default issue

Re: arecord default not working

Two Pi3B - arecord default only one works

Re: Motion with rpi3 jessie

Re: I2C and SPI at same time?