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by owntheweb
Sun Jan 28, 2018 8:54 pm
Forum: General discussion
Topic: Automounting (or ignoring) USB flash drive on boot (no desktop)
Replies: 0
Views: 180

Automounting (or ignoring) USB flash drive on boot (no desktop)

Hello gurus, I have a Trinket M0 that has a USB plug that can power the device and also mounts like a 40kb flash drive, enabling quick edits of a script file on that tiny drive. That's all great when editing on my desktop, but when plugged into a Pi USB, the Pi won't boot with it plugged in. The end...
by owntheweb
Thu Jan 18, 2018 9:41 pm
Forum: Automation, sensing and robotics
Topic: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)
Replies: 8
Views: 1275

Re: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)

joan,
Good thoughts. Let me investigate further (perhaps with your tool!)

Kind regards,
by owntheweb
Thu Jan 18, 2018 7:36 pm
Forum: Automation, sensing and robotics
Topic: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)
Replies: 8
Views: 1275

Re: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)

Thanks all, Due to current budget/available time constraints, I ordered a Trinket M0 as a start. It's cheap, small, lets me run Arduino sketches at a low level and has a built-in RGB LED I can flash as coin pulses are detected. If that works out well, I'll send serial communications to the USB-conne...
by owntheweb
Wed Jan 17, 2018 11:21 pm
Forum: Automation, sensing and robotics
Topic: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)
Replies: 8
Views: 1275

Re: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)

donmerch, Thank you for your response. I'm more at ease as a result! I'll definitely see if I can find an oscilloscope and/or logic analyzer. I'll look into a microcontroller as well. I've had good success with Arduino in the past, and this helps explain why I've seen Pis and Arduinos (or other micr...
by owntheweb
Wed Jan 17, 2018 3:05 pm
Forum: General discussion
Topic: Converting
Replies: 6
Views: 806

Re: Converting

The plot thickens. See this post as I ponder connecting to the IR sensor directly (not sure how good of an idea this is yet). I'm getting reading, but it's not detecting all coins passing through, maybe less than half. Brainstorming on the next best steps!
by owntheweb
Wed Jan 17, 2018 2:56 pm
Forum: Automation, sensing and robotics
Topic: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)
Replies: 8
Views: 1275

Re: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)

Updated idea: I could solder in new wires for the IR sensor and connect directly to the Pi? That would at least remove uncertainty on a refurbished hopper and take out the middle man. hopper-1.jpg From the numbers I could gather, it looks like this is the sensor . hopper-2b.jpg It has a little break...
by owntheweb
Wed Jan 17, 2018 5:22 am
Forum: Automation, sensing and robotics
Topic: coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)
Replies: 8
Views: 1275

coin hopper sensor: not detecting all coins dispensed (Pi GPIO too slow?)

Hello gurus, I'm attempting to get a Pi 3 to instruct a coin hopper to dispense coins using nodejs. So far I'm having some success. I have a relay hat that turns on the hopper from external power and a sensor output from the hopper is being read from a pin. Cool! Challenge: I can't seem to get accur...
by owntheweb
Fri Jan 12, 2018 3:04 pm
Forum: General discussion
Topic: Converting
Replies: 6
Views: 806

Re: Converting

Hey everyone, Thanks for the speedy feedback, especially since I posted such a vague post title (it was late). I'm going to attempt with the internal pull-up resistor enabled. As my current nodejs module I'm using doesn't support setting the pin in this way, I'll start with GPIO pin 3 as it has one ...
by owntheweb
Fri Jan 12, 2018 3:56 am
Forum: General discussion
Topic: Converting
Replies: 6
Views: 806

Converting

Hello gurus, I purchased a refurbished coin hopper that sends out a sensor signal when a coin is ejected. For a Pi though, the signal is bit strong: open collector NPN - active low, maximum sink of 25mA at 35Volt maximum. I'm thinking the 35Volt max will be lower as I'm using a 12VDC input instead o...
by owntheweb
Sat Oct 21, 2017 8:56 pm
Forum: General discussion
Topic: A current/voltage question: driving three DC underwater motors via Pi
Replies: 3
Views: 685

Re: A current/voltage question: driving three DC underwater motors via Pi

Update:

I have my script controlling servos, how-to and scripts shared:
https://github.com/owntheweb/europa-drone

Now to test with an ESC in place of a servo! If this works, I'll post a video.

Thanks again for the assist.
by owntheweb
Mon Oct 16, 2017 9:47 pm
Forum: General discussion
Topic: A current/voltage question: driving three DC underwater motors via Pi
Replies: 3
Views: 685

Re: A current/voltage question: driving three DC underwater motors via Pi

Aha! Thanks much for that. That helps clarify that PWM with ESC may be the way to go. Skimming through the video you sent, they were using PWM to control the ESC. We have three ESCs for three motors, so that's great, with a PWM hat ready to go. The next challenge then for me would be to figure out P...
by owntheweb
Mon Oct 16, 2017 12:54 pm
Forum: General discussion
Topic: A current/voltage question: driving three DC underwater motors via Pi
Replies: 3
Views: 685

A current/voltage question: driving three DC underwater motors via Pi

IMG_2143.JPG Hello Pi gurus, My team acquired two sizable water tanks for use in an upcoming Europa exploration exhibit at the Space Foundation Discovery Center . I'm helping build a Pi controller, controlling an underwater drone the team is building using an NES-style USB controller and Node.js. T...
by owntheweb
Mon Apr 10, 2017 10:44 pm
Forum: General discussion
Topic: green screen photo booth: seeking advise on improvements
Replies: 1
Views: 1137

green screen photo booth: seeking advise on improvements

http://i.imgur.com/Ut6pshk.jpg Working as a marketing web guy at the Space Foundation , the marketing and education teams split the cost of an affordable self-serve green screen kiosk with all parts (screen and supports, cheap lighting, Pi, Pi touch screen, kiosk materials) totalling to roughly $30...
by owntheweb
Thu Feb 23, 2017 11:44 pm
Forum: Raspbian
Topic: Kweb Suite (Minimal Kiosk Browser, omxplayerGUI)
Replies: 1539
Views: 665306

Re: Kweb Suite (Minimal Kiosk Browser)

Thanks for the feedback! I think I see some notable changes in usage. I'll take a fresh look in the morning and work something up.

Thanks again,
by owntheweb
Thu Feb 23, 2017 7:26 pm
Forum: Raspbian
Topic: Kweb Suite (Minimal Kiosk Browser, omxplayerGUI)
Replies: 1539
Views: 665306

Re: Kweb Suite (Minimal Kiosk Browser)

http://christopherstevens.cc/sites/default/files/top-images/digital-signs-top.jpg http://christopherstevens.cc/sites/default/files/gallery-images/digital-signs-3.jpg Hello Kweb gurus, I've used Kweb for a couple of years now to run Pi digital signage at the annual Space Symposium . It works great a...
by owntheweb
Wed Feb 15, 2017 9:19 pm
Forum: Raspbian
Topic: xinit problems after latest XORG update & workaround
Replies: 3
Views: 6749

Re: xinit problems after latest XORG update & workaround

Thanks for the feedback! :D
by owntheweb
Tue Feb 14, 2017 9:18 pm
Forum: Raspbian
Topic: xinit problems after latest XORG update & workaround
Replies: 3
Views: 6749

Re: xinit problems after latest XORG update & workaround

Thanks for posting this! Life is good now thanks to you. ...The only solution I have found so far is to modify the access rights of all (or some) tty devices, which introduces new security risks. Just checking on this. I'm guessing you have to be logged in as someone first before causing security ma...
by owntheweb
Thu Dec 15, 2016 10:41 pm
Forum: General discussion
Topic: Battery Powered Museum Touch Screen Kiosk and Sleepy Pi 2?
Replies: 2
Views: 857

Re: Battery Powered Museum Touch Screen Kiosk and Sleepy Pi

Moses, Ha! That would definitely work for power! xD It looks like the Sleepy Pi's USB power input would take a similar power source as well after talking with the developer. Thanks for the excellent feedback. My math was off and this helps a ton. I'll post an update here once I have something workin...
by owntheweb
Thu Dec 08, 2016 4:52 am
Forum: General discussion
Topic: Battery Powered Museum Touch Screen Kiosk and Sleepy Pi 2?
Replies: 2
Views: 857

Battery Powered Museum Touch Screen Kiosk and Sleepy Pi 2?

Hello, https://www.discoverspace.org/sites/default/files/inline-images/HuygensProbe.JPG At the Space Foundation Discovery Center we have a full scale model of Cassini Heugens Probe, a cool device that landed on Saturn's moon Titan, transmitting all sorts of awesome data along the way. Initially when...
by owntheweb
Sun Aug 28, 2016 3:03 am
Forum: Camera board
Topic: making a true day/night camera for RPi
Replies: 5
Views: 6940

Re: making a true day/night camera for RPi

interest = TRUE; :geek: I was looking into RPi security camera solutions and was kicked in the knees when a friend showed me his cheap live-steaming, motion detecting, IR "night vision" mode, push-to-talk through app network of multiple cameras. I still want to interact with my home security in some...
by owntheweb
Tue Jun 16, 2015 2:53 pm
Forum: General discussion
Topic: Best way to get images from "Mars" to "Mission Control"?
Replies: 2
Views: 499

Re: Best way to get images from "Mars" to "Mission Control"?

Doug,
Awesome. Thanks for sharing!
by owntheweb
Tue Jun 16, 2015 2:38 am
Forum: General discussion
Topic: Best way to get images from "Mars" to "Mission Control"?
Replies: 2
Views: 499

Best way to get images from "Mars" to "Mission Control"?

MarsKids498.jpg So... you have a rover on Mars (or 10 rovers), and want to see what your rover is seeing at Mission Control (in the room next door). What's the best way to transmit video or image stills from a wireless rover (Lego Mindstorms) and monitor remotely? For an extra twist, perhaps you co...
by owntheweb
Tue Jun 16, 2015 2:02 am
Forum: Raspbian
Topic: Kweb Suite (Minimal Kiosk Browser, omxplayerGUI)
Replies: 1539
Views: 665306

Re: Minimal Kiosk Browser

kweb is awesome! I used it when developing digital signage for my organization's annual event, the 31st Space Symposium . Here are some snapshots of some of the 15 screens running kweb on a pi 2: http://www.christopherstevens.cc/projects/event-info-screens-v2 Beyond some of the custom stuff keeping ...

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