Search found 197 matches
- Fri Jun 14, 2019 2:49 pm
- Forum: Automation, sensing and robotics
- Topic: How to maximize Robot Play Time - NiMH Batteries?
- Replies: 6
- Views: 964
Re: How to maximize Robot Play Time - NiMH Batteries?
BAck to basics. There are only four possible problems here; 1. The charger is not doing its job 2. The battery pack is faulty and not holding a charge 3. The robot is using more power than expected 4. The Juice data is bullshit. I suspect you either have a dodgy charge situation, or a bad cell in t...
- Thu Jun 13, 2019 7:02 pm
- Forum: Automation, sensing and robotics
- Topic: How to measure distance with the raspberry pi camera
- Replies: 4
- Views: 3285
Re: How to measure distance with the raspberry pi camera
For a PiCamera fixed to a bot with a fixed/known pointing angle, the distance to the bottom line of the image is a known, fixed number. I have a PiCam v1.3 on my bot: 5MP 1080p30 2592 x 1944 pixels 35mm focal length equiv. focus 1 m to inf. H 53 deg x V 41 deg f/2.9 (Use 1296 x 976 and 2x2 binning f...
- Thu Jun 13, 2019 6:34 pm
- Forum: Automation, sensing and robotics
- Topic: irritating battery limits
- Replies: 21
- Views: 2187
Re: irritating battery limits - this works for my bot
A subject dear to my heart, this is - how to recharge a robot without shutting it down? (In my case because the bot has no wakeup timer function.) Carl Recharging On His Dock.jpg How I solved it for my GoPiGo3 robot: 1) Eight 2800mAh NiMH AA-cells (series connected) 2) Twin pigtails in parallel off ...
- Thu Jun 13, 2019 4:38 pm
- Forum: Automation, sensing and robotics
- Topic: How to maximize Robot Play Time - NiMH Batteries?
- Replies: 6
- Views: 964
How to maximize Robot Play Time - NiMH Batteries?
My question: how to maximize "play time" for my robot? I have been using EBL NiMH rechargeable batteries in my Raspberry Pi robots for the last five years, originally six 5000mAh C-cells, and for the last year - eight 2800mAh AA-cells in my GoPiGo3 robot Carl. My robot charges the eight AA...
- Thu May 02, 2019 4:13 am
- Forum: Raspberry Pi Desktop for PC and Mac
- Topic: geekbench4 file not found weirdness
- Replies: 4
- Views: 739
Re: geekbench4 file not found weirdness
Great info - thanks.fruitoftheloom wrote: ↑Wed May 01, 2019 3:48 pm
Pixel Desktop was renamed nearly 2 years ago:
...
Regards x86-64 64bit version, there has never been a release ...
I'm certainly not hampered by the 32-bit version in any way. At least now I understand the reasons. Double thanks.
- Thu Apr 25, 2019 2:18 am
- Forum: Raspberry Pi Desktop for PC and Mac
- Topic: geekbench4 file not found weirdness
- Replies: 4
- Views: 739
Re: geekbench4 file not found weirdness
From https://www.geekbench.com/download/linux/ : System Requirements Ubuntu 14.04 LTS or later 2GB of RAM Perhaps they really do mean ' Ubuntu ', and not just some similar-looking Debian-based Linux distribution? Apparently. I guess I was lucky that the 32bit version ran. Interestingly, my score wa...
- Tue Apr 23, 2019 2:43 pm
- Forum: Raspberry Pi Desktop for PC and Mac
- Topic: RPi Desktop x86 Canon Printer Installation Problem
- Replies: 5
- Views: 1185
Re: RPi Desktop x86 Canon Printer Installation Problem
I'm stuck on this same issue (a year later) with the 11 Apr 2019 X86 Debian 9 with PIXEL desktop for PC and a Canon MX860 printer.
Agree that this is not a PIXEL desktop issue. Posting here in case anyone has found a solution.
Agree that this is not a PIXEL desktop issue. Posting here in case anyone has found a solution.
- Tue Apr 23, 2019 2:38 pm
- Forum: Raspberry Pi Desktop for PC and Mac
- Topic: geekbench4 file not found weirdness
- Replies: 4
- Views: 739
geekbench4 file not found weirdness
I am running Geekbench-4.3.3-Linux on (uname -a): Linux AlanLaptop 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3.1 (2019-02-19) x86_64 GNU/Linux (Raspberrypi.org X86 Debian with RaspberryPi (formerly PIXEL) desktop for PC 11Apr2019) on a Toshiba Portege Z935 with 5.73GB memory Toshiba Version 6.80 BIOS, Int...
- Thu Aug 30, 2018 12:00 pm
- Forum: Automation, sensing and robotics
- Topic: NiMH Batteries - Selecting Safe Shutdown Limit
- Replies: 5
- Views: 881
Re: NiMH Batteries - Selecting Safe Shutdown Limit
The risk with multiple NiMH cells in series is that their capacities are or become different enough such that (because of the "cliff edge") one cell reaches zero while the others still have sufficient voltage that the powered circuit continues to operate and draw current. Operation with c...
- Thu Aug 30, 2018 11:37 am
- Forum: Automation, sensing and robotics
- Topic: NiMH Batteries - Selecting Safe Shutdown Limit
- Replies: 5
- Views: 881
Re: NiMH Batteries - Selecting Safe Shutdown Limit
... Set that too high, and [it] wouldn't run long enough on one charge; set it too low and the life of the battery was compromised, so ...set it to ... 1.1v cut-off So along came some cowboys, ... cut-off became 1.0v. ... life of the pack was reduced, ... almost no extra run-time, because of the cl...
- Thu Aug 30, 2018 12:38 am
- Forum: Automation, sensing and robotics
- Topic: NiMH Batteries - Selecting Safe Shutdown Limit
- Replies: 5
- Views: 881
NiMH Batteries - Selecting Safe Shutdown Limit
I just built a new bot based on the GoPiGo3 platform and need to select a safe shutdown voltage limit. * I am using 8 AA size 2300 mAH NiMH cells and a Tenergy multi-voltage peaking charger. * (The GoPiGo3 has a get_battery_voltage() function which returns a value which is 0.6v less than the actual...
- Thu Jul 05, 2018 12:05 pm
- Forum: Troubleshooting
- Topic: sudo apt-get update uses IPv6 - have to force IPv4 to succeed
- Replies: 4
- Views: 2891
Re: sudo apt-get update uses IPv6 - have to force IPv4 to succeed
Just a thought: what happens if you use Google DNS server?
- Wed Dec 20, 2017 7:55 pm
- Forum: General discussion
- Topic: Boinc not working after upgrade to Stretch
- Replies: 2
- Views: 675
Re: Boinc not working after upgrade to Stretch
I had to do the same thing twice after early Stretch updates. Did an update this week that did not affect my BOINC.
- Fri Dec 15, 2017 5:32 pm
- Forum: Troubleshooting
- Topic: Debugging Motion and the Raspberry Pi Camera
- Replies: 1
- Views: 1288
Re: Debugging Motion and the Raspberry Pi Camera
This worked for me this morning: Motion for Raspberry Pi sudo modprobe bcm2835-v4l2 sudo /etc/modules to add: # camera with v4l2 driver bcm2835-v4l2 reboot sudo apt-get install motion sudo cp /etc/motion/motion.conf /etc/motion/motion.conf.bak sudo nano /etc/motion/motion.conf to change: rotate 180 ...
- Fri Dec 15, 2017 12:12 am
- Forum: Troubleshooting
- Topic: RPi3 WiFi interference?
- Replies: 0
- Views: 409
RPi3 WiFi interference?
Anecdotally, when I have two RPi3 on the same subnet (10.0.0.x on US channel 6), or even same subnet, different WiFi networks (SSID1 and SSID2 in same room, two routers on different channels - US 3 and US 6) I often see: sudo apt-get update Ign:1 http://archive.raspberrypi.org/debian stretch InRelea...
- Tue Nov 28, 2017 1:30 am
- Forum: Troubleshooting
- Topic: Solved: After rpi-update my robot can't feel his toes
- Replies: 3
- Views: 585
Re: Solved: After rpi-update my robot can't feel his toes
Why did you use rpi-update? It's not recommended for casual users. I was warned "Or for the brave and foolhardy", in a suggestion in response to my Pi3 built-in WiFi frustrations. If you are giving feedback for experimental software then you'll need to provide much more information than '...
- Tue Nov 28, 2017 12:12 am
- Forum: Troubleshooting
- Topic: Solved: After rpi-update my robot can't feel his toes
- Replies: 3
- Views: 585
Solved: After rpi-update my robot can't feel his toes
After I did an rpi-update this morning, my robot couldn't move and felt weak (no motor PWM and couldn't SPI to the Analog Digital Converter ). I reverted the firmware and my robot feels much better again. This one works: uname -a: Linux RWPi 4.9.41-v7+ #1023 SMP Tue Aug 8 16:00:15 BST 2017 armv7l GN...
- Mon Nov 27, 2017 11:58 am
- Forum: Troubleshooting
- Topic: Pi3 onboard Wifi: Ping Request timeouts
- Replies: 6
- Views: 2889
Re: Pi3 onboard Wifi: Ping Request timeouts
Run this sudo apt update && sudo apt -y dist-upgrade && sudo reboot Or for the brave and foolhardy sudo rpi-update && sudo reboot The following packages will be upgraded: libsmbclient libwbclient0 samba-common samba-libs 4 upgraded, 0 newly installed, 0 to remove and 0 not u...
- Mon Nov 27, 2017 10:55 am
- Forum: Troubleshooting
- Topic: Pi3 onboard Wifi: Ping Request timeouts
- Replies: 6
- Views: 2889
Re: Pi3 onboard Wifi: Ping Request timeouts
uname -a:
Linux RWPi 4.9.41-v7+ #1023 SMP Tue Aug 8 16:00:15 BST 2017 armv7l GNU/Linux
vcgencmd version:
Aug 8 2017 12:05:45
Copyright (c) 2012 Broadcom
version 196063438d7bb0769861c86f948ae653727adb7e (clean) (release)
- Sat Nov 25, 2017 3:04 pm
- Forum: Advanced users
- Topic: Disable power management in Stretch
- Replies: 12
- Views: 59787
Re: Disable power management in Stretch
added to /etc/rc.local: iwconfig wlan0 power off resulted in my Stretch Pi3 onboard wifi power management being permanently off. For my robot, this reduces the tx excessive retries by a factor of 10, and incoming ping Request timeouts by a factor of 2. Linux RWPi 4.9.41-v7+ #1023 SMP Tue Aug 8 16:00...
- Fri Nov 24, 2017 10:08 pm
- Forum: Troubleshooting
- Topic: Second SD card went read-only - Is shutdown -h now safe?
- Replies: 3
- Views: 1085
Second SD card went read-only - Is shutdown -h now safe?
Recently my robot suffered its second "read-only" SD card failure. At the moment, if my robot detects that it only has a few minutes of life left, it executes an os.system( "sudo shutdown -h now") Is shutdown -h now safe to issue? The robot launches several Python processes to ma...
- Fri Nov 24, 2017 9:12 pm
- Forum: Troubleshooting
- Topic: Pi3 onboard Wifi: Ping Request timeouts
- Replies: 6
- Views: 2889
Pi3 onboard Wifi: Ping Request timeouts
My robot has a (new) Pi3 running updated Raspbian Stretch, with a remote ssh session over wlan0, and a Python2.7 multi-process sensor status loop running, with a 15 minute top load of 0.10 When I ping the bot via WiFi, I see about 10 "Request timeout for icmp_seq x" per hour. With power ma...
- Thu Nov 09, 2017 2:23 pm
- Forum: Troubleshooting
- Topic: Green LED blinks 30 times on shutdown
- Replies: 5
- Views: 1033
- Thu Nov 09, 2017 12:38 pm
- Forum: Troubleshooting
- Topic: Green LED blinks 30 times on shutdown
- Replies: 5
- Views: 1033
Re: Green LED blinks 30 times on shutdown
Not normal Thanks. And for all your assistance in chasing the WiFi issue. I ordered up a new Pi3. This is the second Pi, out of four, my robot has messed up. I keep trying to enable it to be more capable, but it seems to be resisting artificial intelligence. (It began “life” 18 years ago with 32k o...
- Thu Nov 09, 2017 11:37 am
- Forum: Troubleshooting
- Topic: Green LED blinks 30 times on shutdown
- Replies: 5
- Views: 1033
Green LED blinks 30 times on shutdown
I have been used to waiting for the 10 blinks on shutdown of jessie-lite. I'm on "full" stretch now, and seeing the green LED flash 30 times on shutdown. Is this the new normal, or has my Pi gained consciousness and is trying to tell me not to shut it off?