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by amcdonley
Wed Nov 01, 2017 2:39 am
Forum: Troubleshooting
Topic: sudo apt-get update uses IPv6 - have to force IPv4 to succeed
Replies: 2
Views: 1970

sudo apt-get update uses IPv6 - have to force IPv4 to succeed

I successfully installed 2017-09-17-stretch (full) headless with wpa_supplicant.conf: country=US ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev update_config=1 network={ ssid="MYWIFISSID" psk="MY11CHARPASSKEY" key_mgmt=WPA-PSK } When I try to update, it is using IPv6 $ sudo apt-get update 0...
by amcdonley
Wed Nov 01, 2017 2:03 am
Forum: Troubleshooting
Topic: Loosing my head over headless...
Replies: 42
Views: 4009

Re: Loosing my head over headless...

Edit: A quick Google search shows maybe you should use an app named TextEdit instead of textapp. TextEdit is the editor I used. I discovered my problem: I had copied the text from a web page and pasted it into TextEdit. The quote chars from the web were the Unicode left/right double quote!! My old,...
by amcdonley
Tue Oct 31, 2017 6:01 pm
Forum: Automation, sensing and robotics
Topic: Python and Robotics
Replies: 4
Views: 3571

Re: Python and Robotics

I use Python on my robot. There are great open source examples of Python available for the GoPiGo robot. BTW, GoPiGO is a well designed robot, with excellent forum for their users, and educators. If I was starting out to build a robot again, I believe the GoPiGo is the best platform and support syst...
by amcdonley
Tue Oct 31, 2017 5:34 pm
Forum: Automation, sensing and robotics
Topic: Powering a RaspberyPi for a moving robot. (Solved)
Replies: 5
Views: 1206

Re: Powering a RaspberyPi for a moving robot. (Solved)

Is there a power cell or a power pack I should look for in particular for this issue? To give good suggestions, we need to know a little more about your robot, such as: 1) Which Raspberry Pi board are you powering? 2) Are all the motors/servos powered separately from the Pi board? 3) How much run t...
by amcdonley
Tue Oct 31, 2017 1:32 pm
Forum: Troubleshooting
Topic: Loosing my head over headless...
Replies: 42
Views: 4009

Re: Loosing my head over headless...

Did you not read my posts? I just did two headless installs that went fine. "Works for me" really doesn't feel good to those of us that are seeing this issue. You may be onto something about what editor is used to create the wpa_supplicant.conf file. My recent headless stretch flogging seems to sha...
by amcdonley
Tue Oct 31, 2017 11:45 am
Forum: Troubleshooting
Topic: is the raspian mirror server down?
Replies: 19
Views: 8678

Re: is the raspian mirror server down?

Anyone know if there is a work around mirror? You could (temporarily) change the URL in /etc/apt/sources.list to one of the mirrors: https://www.raspbian.org/RaspbianMirrors http://mirrordirector.raspbian.org/raspbian/ is not working for me at the moment, so tried: deb http://raspbian.mirrors.wvsta...
by amcdonley
Tue Oct 31, 2017 1:46 am
Forum: Troubleshooting
Topic: Raspbian Stretch: Wifi not starting on boot
Replies: 93
Views: 130449

Re: Raspbian Stretch: Wifi not starting on boot

I just finished two days of flogging with "wlan0 not associated" with 2017-09-07-raspbian-stretch on a Pi3 that was playing nice under jessie-lite. I tried the headless method with: wpa_supplicant.conf per the thread head: country=US ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev update_con...
by amcdonley
Mon Oct 30, 2017 7:20 pm
Forum: Advanced users
Topic: Can Allowing Throttling Optimize Processing Throughput?
Replies: 2
Views: 786

Re: Can Allowing Throttling Optimize Processing Throughput?

solid aluminum case Indeed, that worked very nicely till I wanted to add a LIFePO4 UPS to protect my SD card from power failures. Pi3 is mounted vertically (on edge) in free air. A 15mm cube heat sink is stuck on with 3M thermal tape. That is how I was running with the UPS until I came home and fou...
by amcdonley
Sun Oct 29, 2017 2:40 pm
Forum: Advanced users
Topic: Can Allowing Throttling Optimize Processing Throughput?
Replies: 2
Views: 786

Can Allowing Throttling Optimize Processing Throughput?

I am wondering if optimal processing on my Pi3 might result from allowing short bursts of temperature caused throttling. I have been running Einstein@Home/BOINC on my Pi3 with load limits tuned to prevent temperature throttling. At these settings, the temperature hovers around 71 degrees C, and will...
by amcdonley
Sun Oct 08, 2017 2:53 pm
Forum: Troubleshooting
Topic: remote desktop from Mac to RPi "incompatible version"
Replies: 0
Views: 703

remote desktop from Mac to RPi "incompatible version"

For some reason "Screen Sharing" app from my Mac Mini (OS 10.12.6 Sierra) started reporting that that "version running on remote computer is incompatible with Screen Sharing". It seems like a crash had left some droppings in /tmp/.X11-unix/ To fix it, I did the following: ssh pi@ip.of.rpi ps -ef | g...
by amcdonley
Mon Oct 02, 2017 8:55 pm
Forum: Automation, sensing and robotics
Topic: MCP3008, Voltage Divider and Pressure Transmitter
Replies: 8
Views: 2242

Re: MCP3008, Voltage Divider and Pressure Transmitter

On my robot, I use the 5v RPi for vRef (and VDD) on the 3008, and only level shift the DOUT (using r1.r2 divider) from the 3008. The I2CS, DIN, CLK from RPi (3.3v) go straight into the 3008 no problem, no level shift needed. When running the 3008 with 5v ref, there is no need to level shift your 0-5...
by amcdonley
Mon Oct 02, 2017 7:51 pm
Forum: Troubleshooting
Topic: Throttling 0x10000?
Replies: 2
Views: 322

Re: Throttling 0x10000?

Thanks.
by amcdonley
Mon Oct 02, 2017 6:46 pm
Forum: Troubleshooting
Topic: Throttling 0x10000?
Replies: 2
Views: 322

Throttling 0x10000?

I've been running BOINC projects on my Pi3 at an average load of 2 and 70-74C, powered at 4.97v at the header for the last 18 days with no problems. I updated the OS last night, and rebooted, which started BOINC processing again. Roughly eight hours later, while showing the same load, temps, and vol...
by amcdonley
Wed Sep 27, 2017 4:12 pm
Forum: Automation, sensing and robotics
Topic: Raspi + L298N = Hang
Replies: 4
Views: 854

Re: Raspi + L298N = Hang

Try check temperature and power status in each loop:

vcgencmd measure_temp
vcgencmd get_throttled
by amcdonley
Wed Aug 23, 2017 4:35 pm
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 209
Views: 341983

Interpreting get_throttled=0x10000 or 0x30000

How should I interpret get_throttled=0x10000 or 0x30000 ? This post seems to imply under-voltage and throttling come together (I added hex views) 0: under-voltage (0xX0001) 1: arm frequency capped (0xX0002 or 0xX0003 with under-voltage) 2: currently throttled (0xX0004 or 0xX0005 with under-voltage) ...
by amcdonley
Tue Aug 22, 2017 10:25 pm
Forum: Automation, sensing and robotics
Topic: cam-track.py Now Windows, Unix compatible using web cam as well as Raspberry Pi
Replies: 1
Views: 1052

Re: cam-track.py Install - Wow!

Cool - Especially thank you for the one line opencv and all dependencies install. Somewhere I read about a book with 128 steps to follow to install OpenCV, so I have been putting off my initiation into OpenCV. I am running cam-track.py on Stretch upgraded from Jessie (using OS X remote desktop displ...
by amcdonley
Mon Aug 21, 2017 9:12 pm
Forum: Troubleshooting
Topic: LifePO4wered/Pi3, BOINC, and throttled=0x100000
Replies: 0
Views: 243

LifePO4wered/Pi3, BOINC, and throttled=0x100000

I added the LiFePO4wered/Pi3 UPS to my RPi3, along with the 15x15x15mm Adafruit heatsink and moved from a metal Flirc case to an acrylic case for the UPS and Pi3. My "boincstatus.sh script checks the temperature and throttled flags once every 10 seconds. I was seeing get_throttled would return throt...
by amcdonley
Sun Jul 23, 2017 1:45 am
Forum: Automation, sensing and robotics
Topic: tilt-pan servo reference directions?
Replies: 0
Views: 340

tilt-pan servo reference directions?

The GoPiGo robot pan_servo(angle) function puts 0 degrees facing left, 90 degrees straight ahead, and 180 to the right. (gopigo.py for rev 2.) If I understand the ROS Wiki correctly, ROS (and iRobot) put the robot frame X axis straight ahead, Z up), with positive angles turn left (from the x axis/fo...
by amcdonley
Sat Jul 22, 2017 2:49 am
Forum: Automation, sensing and robotics
Topic: Can't Recharge While RPi Is On
Replies: 8
Views: 1443

Re: Can't Recharge While RPi Is On

mosespi wrote: MoPower UPS
I needed to study this puppy a bit. It looks good as a UPS, but 50ma charge rate won't get me 4000ma over night. Oh well, was hoping.
by amcdonley
Sat Jul 22, 2017 2:04 am
Forum: Automation, sensing and robotics
Topic: Can't Recharge While RPi Is On
Replies: 8
Views: 1443

Re: Can't Recharge While RPi Is On

Thanks @mosespi - gives me some options and helps me understand how schottky diodes work.
by amcdonley
Fri Jul 21, 2017 10:51 pm
Forum: Automation, sensing and robotics
Topic: Can't Recharge While RPi Is On
Replies: 8
Views: 1443

Re: Can't Recharge While RPi Is On

Somewhere I saw an I2C Real Time Clock that could wake-up the RPi. I'll have to see if I can drive onto a recharging station, then shutdown with a scheduled "wake me up in four hours". If the bot shuts down right away, it might just work. I'll have to figure out if my Pololu SP power switch can be t...
by amcdonley
Fri Jul 21, 2017 7:16 pm
Forum: Automation, sensing and robotics
Topic: Can't Recharge While RPi Is On
Replies: 8
Views: 1443

Re: Can't Recharge While RPi Is On

Good point - so perhaps a large Capacitor (or on the extreme the LiFePO4wered/Pi battery+charger) would isolate the load variation from the battery.
by amcdonley
Fri Jul 21, 2017 6:43 pm
Forum: Automation, sensing and robotics
Topic: Can't Recharge While RPi Is On
Replies: 8
Views: 1443

Can't Recharge While RPi Is On

My RPi3 based robot is powered by 6 Ni-MH 5000mAh C-cells. I use a Tenergy 1025 "Smart" charger which auto detects that the nominal battery is 7.2v, charges at 2A using "negative delta-V" to detect when to switch to trickle charging. This all works wonderful IF my robot is shutdown first. If I leave...
by amcdonley
Thu Jul 20, 2017 4:17 pm
Forum: Camera board
Topic: Object and Feature Recognition
Replies: 2
Views: 881

Re: Object and Feature Recognition

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.
by amcdonley
Tue Jul 18, 2017 2:28 pm
Forum: Automation, sensing and robotics
Topic: Robot Life on Ni-MH Batteries
Replies: 1
Views: 490

Robot Life on Ni-MH Batteries

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...

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