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by cupcake
Sun Jul 06, 2014 6:34 pm
Forum: Troubleshooting
Topic: Battery-powered RPi freezes when taking picture
Replies: 9
Views: 1677

Re: Battery-powered RPi freezes when taking picture

Thanks everyone for valuable input. I'm learning a lot about batteries and USB connections here. What is the voltage rating of the power adapter that came with your USB HUB? It's stated as 5V on the adapter itself. When I measure it (connected to socket and nothing else) with my multimeter it reads ...
by cupcake
Sun Jul 06, 2014 6:24 pm
Forum: Troubleshooting
Topic: Battery-powered RPi freezes when taking picture
Replies: 9
Views: 1677

Re: Battery-powered RPi freezes when taking picture

ghans wrote:The minimum supply voltage of the Pi is 4.75 V.
Yes, I thought so too. But when I measure the test points during functional operation it's showing 4.64 V with drops to 4.45 V. Could my multimeter be off by that much perhaps?
by cupcake
Sun Jul 06, 2014 4:25 am
Forum: Troubleshooting
Topic: Battery-powered RPi freezes when taking picture
Replies: 9
Views: 1677

Re: Battery-powered RPi freezes when taking picture

One way to prove that would be to measure the voltage on the test points and then activate the camera (when running on batteries) and see if there is a sudden dip in voltage. Tried this now with the RPi running on battery but the USB HUB with wifi running from outlet. - With no activity on the RPi,...
by cupcake
Sun Jul 06, 2014 4:16 am
Forum: Troubleshooting
Topic: Battery-powered RPi freezes when taking picture
Replies: 9
Views: 1677

Re: Battery-powered RPi freezes when taking picture

Just tried something. Powering the RPi alone directly from the battery. Then powering the USB HUB (and thus the wifi adapter) from the outlet. Seems to work just fine. Not sure what conclusion to draw from that.
by cupcake
Sun Jul 06, 2014 4:12 am
Forum: Troubleshooting
Topic: Battery-powered RPi freezes when taking picture
Replies: 9
Views: 1677

Re: Battery-powered RPi freezes when taking picture

Thanks. Yes, since it works with socket power and not with battery power - that is likely the culprit. I may be completely off here, but it was my understanding that batteries will pretty much provide whatever current is needed from it? Up to a max. The output from my battery pack states 2A, which s...
by cupcake
Sun Jul 06, 2014 1:20 am
Forum: Troubleshooting
Topic: Battery-powered RPi freezes when taking picture
Replies: 9
Views: 1677

Battery-powered RPi freezes when taking picture

Hello, I'm working on a battery powered rover and I'm in a bit of a pickle with regards to the camera module. Note that I am no expert on this by any means. Here's a picture of my setup: http://i.imgur.com/FI3EtAx.jpg (ignore the GPIO connectors) To summarize: - RPi is connected to a powered USB HUB...
by cupcake
Thu Jan 09, 2014 7:26 am
Forum: General discussion
Topic: Powering RPi through USB HUB: USB to DC cable
Replies: 0
Views: 354

Powering RPi through USB HUB: USB to DC cable

Hello, I can currently power my RPi using this USB power pack. In other words: Battery -> USB to Micro USB cable -> RPi. This works fine. However, I now wish to add a more powerful USB WiFi adapter, which requires me to power it through a powered USB HUB. I will then also power the RPi from the HUB....
by cupcake
Tue Jan 07, 2014 7:25 pm
Forum: Camera board
Topic: RPi Cam Web Interface
Replies: 5069
Views: 1341945

Re: RPi Cam Web Interface

Thanks a bunch for posting your work, Silvian. Your implementation is exactly what I need. Low-latency live feed with the option of recording high-quality images/videos and various video picture configuration options. I'll be using this for my rover.
by cupcake
Mon Jun 10, 2013 12:54 am
Forum: Automation, sensing and robotics
Topic: Affordable robot development platforms
Replies: 8
Views: 3125

Re: Affordable robot development platforms

Thanks for the input, Ravenous. Appreciated. I still think the Dagu Rover 5 is the closest thing I get to what I'm looking for. It's relatively cheap (~ $60) and appears to provide decent size and power. It's made for these sort of projects so it should be straight-forward to interface with it. Orde...
by cupcake
Mon Jun 03, 2013 5:50 pm
Forum: Automation, sensing and robotics
Topic: Affordable robot development platforms
Replies: 8
Views: 3125

Re: Affordable robot development platforms

I had a similar strategy as yours in the beginning: Get something that'll "do for now" first and upgrade later on if need and interest is there. Which is why I got the Mr. Basic. And it's fulfilled its duty in the sense that I have an RPi that now interacts with motors and consequently can drive aro...
by cupcake
Sat Jun 01, 2013 2:34 pm
Forum: Automation, sensing and robotics
Topic: Affordable robot development platforms
Replies: 8
Views: 3125

Re: Affordable robot development platforms

Thanks for the suggestions so far. The big trac and the DX platform suggested are both very cheap, which is great. But thinking somewhat longer term, I suspect I might be better off throwing the extra money in for something like the Rover 5, as it will be able to handle a lot more variable driving s...
by cupcake
Fri May 31, 2013 7:53 pm
Forum: Automation, sensing and robotics
Topic: Affordable robot development platforms
Replies: 8
Views: 3125

Affordable robot development platforms

I'm working on a project to build an RPi-based rover which ultimately should be autonomous. As my mechanical skills are somewhat lacking, I'm basing this on an existing development platform. In the beginning, price was the primary concern and I opted to go for the very simple Dagu Mr. Basic: http://...
by cupcake
Sat Jan 12, 2013 5:54 pm
Forum: Automation, sensing and robotics
Topic: RaspCar (my RC Project)
Replies: 3
Views: 1499

Re: RaspCar (my RC Project)

Looks great. I'd love to get more details on it.
by cupcake
Fri Nov 09, 2012 11:57 pm
Forum: HATs and other add-ons
Topic: Pi instead of Gertboard
Replies: 11
Views: 2864

Re: Pi instead of Gertboard

Same here. First got a new 512MB RPi instead of the Gertboard. Then got the Gertboard. All for the price of just the Gertboard.

Well done, Newark.
by cupcake
Mon Oct 15, 2012 8:28 pm
Forum: Graphics, sound and multimedia
Topic: Webcam saturation control from command line
Replies: 10
Views: 16943

Re: Webcam saturation control from command line

Love the guide bobtech. I'll try your approach once I get home. I've been struggling to get my webcam(s) to work.

Did you encounter any issues with the webcam crashing a few frames in?
by cupcake
Mon Oct 15, 2012 8:19 pm
Forum: HATs and other add-ons
Topic: best wifi dongle for raspberry pi..<< OS.Raspbian “wheezy”>>
Replies: 5
Views: 29107

Re: best wifi dongle for raspberry pi..<< OS.Raspbian “wheez

There should be tons of information on this already, both here and in the wiki.

That said, I'm very happy with my choice of TP Link TL-WN722N. It does require a powered HUB, though.
by cupcake
Wed Oct 10, 2012 11:41 pm
Forum: Graphics, sound and multimedia
Topic: Webcam - motion not working - but video ok on mplayer
Replies: 25
Views: 67615

Re: Webcam - motion not working - but video ok on mplayer

I was sent to this thread from my issue described here (link).

Is the general consensus that webcams are problematic with latest Wheezy?
by cupcake
Fri Sep 21, 2012 3:41 pm
Forum: HATs and other add-ons
Topic: Webcam troubles: Turns off after a few frames
Replies: 12
Views: 8887

Re: Webcam troubles: Turns off after a few frames

1) So it could be that these cameras are faulty (we eliminate this by testing on alternative hardware) note they could be faulty and still work with alternative hardware i.e. hardware with a more robust USB driver or power supply. As I briefly mentioned, I've had this problem on 3 different webcams...
by cupcake
Sun Aug 19, 2012 2:10 am
Forum: HATs and other add-ons
Topic: Webcam troubles: Turns off after a few frames
Replies: 12
Views: 8887

Re: Webcam troubles: Turns off after a few frames

Problem persists for me. I've tried with 3 different webcams (2x Logitech and 1x Microsoft) and adding/removing all other USB devices.

No luck.

Anyone got any possible solution to this?
by cupcake
Wed Aug 08, 2012 12:45 am
Forum: General discussion
Topic: Battery to power HUB + RPi + Wifi adapter + Webcam - Amps?
Replies: 4
Views: 3959

Re: Battery to power HUB + RPi + Wifi adapter + Webcam - Amp

probably NiMH
I figured NiMH would be the easier choice as they are available in 5V, whereas LiPos all seem to be available in multitudes of 3.7V - requiring some regulation in between. Correct me if I'm wrong here.
by cupcake
Wed Aug 08, 2012 12:43 am
Forum: Automation, sensing and robotics
Topic: Battery to power RPi and powered HUB
Replies: 13
Views: 6155

Re: Battery to power RPi and powered HUB

What kind of battery are you planning on using? I'm doing more or less the same thing with a Li-Po, I've worked everything out but I haven't built it yet. That is a good question. I'm in the process of deciding on one. I'm a little confused as to the various options that are available. I have a thr...
by cupcake
Wed Aug 08, 2012 12:35 am
Forum: General discussion
Topic: Battery to power HUB + RPi + Wifi adapter + Webcam - Amps?
Replies: 4
Views: 3959

Re: Battery to power HUB + RPi + Wifi adapter + Webcam - Amp

Batteries give as much amps as the load demands.
Is that always the case? I'm confused by various rechargeable batteries and power banks claiming a maximum output of something like 1A. Or is that specific to batteries where the output is provided by USB?
by cupcake
Mon Aug 06, 2012 8:35 pm
Forum: HATs and other add-ons
Topic: Webcam troubles: Turns off after a few frames
Replies: 12
Views: 8887

Webcam troubles: Turns off after a few frames

I've connected my RPi to a Microsoft VX-3000 webcam, both powered from a CyberPower CPH420P powered HUB. I'm able to grab a single snapshot just fine: pi@raspberrypi ~ $ streamer -c /dev/video0 -o test.jpeg -s 640x480 -t 1 files / video: JPEG (JFIF) / audio: none I can open the created jpeg file and...
by cupcake
Mon Aug 06, 2012 6:50 pm
Forum: General discussion
Topic: Battery to power HUB + RPi + Wifi adapter + Webcam - Amps?
Replies: 4
Views: 3959

Battery to power HUB + RPi + Wifi adapter + Webcam - Amps?

There are various threads out there on various battery options. But I can't seem to find one that covers powering a system of an RPi plus some power hungry USB devices. I'm currently using an AC adapter to power a HUB that then power/connects the RPi, a wifi adapter, and a webcam. Powered HUB: Cyber...
by cupcake
Mon Aug 06, 2012 5:22 pm
Forum: Automation, sensing and robotics
Topic: Battery to power RPi and powered HUB
Replies: 13
Views: 6155

Re: Battery to power RPi and powered HUB

I was successfully able to power USB devices (wifi adapter, webcam) and the RPi using my CyberPower Hi-Speed USB Hub 4-Port - which makes everything a lot easier.

Thanks for the input, everyone.

Next step will be to replace the AC adapter with a battery.

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