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by agraco
Sun Feb 12, 2017 10:37 pm
Forum: Scratch
Topic: Weightlessness Project from RPi.org.
Replies: 1
Views: 1569

Weightlessness Project from RPi.org.

I am trying to troubleshoot the work of my 9 year old and everything she has done looks consistent with the instructions. Would someone please provide advice on what we are doing wrong? Source: https://www.raspberrypi.org/learning/weightlessness/worksheet/ Project: https://scratch.mit.edu/projects/1...
by agraco
Mon Jan 23, 2017 1:32 pm
Forum: General discussion
Topic: Wire and loop game
Replies: 6
Views: 1512

Re: Wire and loop game

Hi everyone. Wow, thanks so much....especially the last bit of advice "The rails down the side are split into two groups each. 25 pins and 25 pins".

For clarity, the circuit diagram is NOT mine. Lifted it from a link within a recent MagPi article.
by agraco
Mon Jan 23, 2017 3:11 am
Forum: General discussion
Topic: Wire and loop game
Replies: 6
Views: 1512

Re: Wire and loop game

Hi. Here the is the circuit diagram that we are following.

https://goo.gl/photos/grpTqkpovNRAJcsXA

Because i am using a T-connector, i am confused with respect to the connection back to the ground.

Tks
by agraco
Mon Jan 23, 2017 12:52 am
Forum: General discussion
Topic: Wire and loop game
Replies: 6
Views: 1512

Wire and loop game

Hi. I am trying to do the wire and loop game. My question focuses on the T-connector for the bread board. In the linked picture, i have three yellow wires (left side) going to the negative of the 3.3 volt line (blue). Question, do I need the fourth wire on the right that goes from the negative to th...
by agraco
Wed Aug 31, 2016 4:38 pm
Forum: General discussion
Topic: RPi Phone or Tablet
Replies: 16
Views: 3635

Re: RPi Phone or Tablet

How is issue #49 not for beginners? https://www.raspberrypi.org/magpi/issues/49/ Hi! The text could be greatly improved if it was more focused on its stated objective, written on the cover of Issue 49: "How to set up and use (the RPi) for the first time". There is a lot of information that goes way...
by agraco
Tue Aug 30, 2016 6:28 pm
Forum: General discussion
Topic: RPi Phone or Tablet
Replies: 16
Views: 3635

Re: RPi Phone or Tablet

I thirnk that building a tablet teaches nothing. Get a RPi Zero and a breadboard kit. Start doing some of the projects from the MagPi magazine. Learn python, learn Java. Work on the Internet of Things (using Mosquitto and/or RabbitMQ). Work on software controlled hardware (LEDs, relays, motor contr...
by agraco
Fri Aug 26, 2016 6:51 pm
Forum: General discussion
Topic: RPi Phone or Tablet
Replies: 16
Views: 3635

Re: RPi Phone or Tablet

Try sticking the phone in a bowl of rice overnight. (Im not joking, the rice will suck all the moisture out of the phone). Thanks for this. It has been in the bowl for a week now. The phone seems to boot up but is not functional. I get the error on the screen that the phone is overheating and needs...
by agraco
Thu Aug 25, 2016 9:48 pm
Forum: General discussion
Topic: RPi Phone or Tablet
Replies: 16
Views: 3635

Re: RPi Phone or Tablet

Thanks. This makes me lean even more towards having her build a tablet. I appreciate the comment on the cost. The point for me is that I want her to learn something about technology...so I am a little less fixated on the issue of cost. I feel kids of today don't understand technology and need some i...
by agraco
Thu Aug 25, 2016 4:31 am
Forum: General discussion
Topic: RPi Phone or Tablet
Replies: 16
Views: 3635

RPi Phone or Tablet

The Backstory: My kid ignored my advice when going into the lake. A very simple "get out of your clothes and put on your swimsuit". As a result of ignoring me and walking into the lake, the iPhone-4 drowned. I feel that asking my child to build a phone or a tablet is a decent way for my child to off...
by agraco
Tue May 03, 2016 2:28 am
Forum: Automation, sensing and robotics
Topic: Build a circuit board
Replies: 11
Views: 4226

Re: Build a circuit board

If you control the mosfets via an MCP23017 i2c gpio expander, you only need a few connections (and you can connect up to 8 to the Pi for a total of 128 i/o). Hi. This looks incredibly interesting but, for right now, beyond my skills. I have never built my own circuit board so just getting this to w...
by agraco
Mon May 02, 2016 7:09 pm
Forum: Automation, sensing and robotics
Topic: Build a circuit board
Replies: 11
Views: 4226

Re: Build a circuit board

Thank you. my thinking on the female dupont cables is that they are useful for prototyping...Then don't seem to firmly stay on the RPi. And since I will be using 17 GPIO pins, that is a lot of cables to play with. I have not found a ribbon cable that is male-female and can be pushed into a circuit b...
by agraco
Mon May 02, 2016 6:50 pm
Forum: Automation, sensing and robotics
Topic: Build a circuit board
Replies: 11
Views: 4226

Build a circuit board

Hi. I am building my first circuit board ... Project : I would like the RPi to control 5 LED strips, plus 1-2 motion sensors. Each LED strip needs 3 MOSFETs, which means 15 GPIO pins, plus 2 sensors. Progress so far : Using a breadboard, I have prototyped one of the LED strips with the MOSFETs. I us...
by agraco
Wed Apr 06, 2016 11:08 pm
Forum: Automation, sensing and robotics
Topic: technical question: power source + breadboard
Replies: 6
Views: 1277

Re: technical question: power source + breadboard

huh...it did not occur to me that I could buy a single 12 V power source to power multiple LED strips. I know the power source I have only works with a single strip. Each strip is 5M (16 feet) long. I will look into this. thanks so much for this last bit
by agraco
Wed Apr 06, 2016 9:48 pm
Forum: Automation, sensing and robotics
Topic: technical question: power source + breadboard
Replies: 6
Views: 1277

Re: technical question: power source + breadboard

Hmmm. I see what you are saying. Let me try and focus the conversation. I have attached a picture. I hope this will help. on the left: 12V power source. At the bottom: there is a LED strip that is being powered. On the bread board: Three transistors to adjust the LED strip. I want to replicate this ...
by agraco
Wed Apr 06, 2016 7:48 pm
Forum: Automation, sensing and robotics
Topic: technical question: power source + breadboard
Replies: 6
Views: 1277

Re: technical question: power source + breadboard

Each device will be linked to a specific GPIO which is then "controlled" by a small program in Python. The trigger will be a website. In this way, every mobile device in the house can remotely control the devices, whether a camera to take a picture, send a live feed, turn on some lights, water the h...
by agraco
Wed Apr 06, 2016 5:12 pm
Forum: Automation, sensing and robotics
Topic: technical question: power source + breadboard
Replies: 6
Views: 1277

technical question: power source + breadboard

Situation: I want to control multiple devices from a single raspberry. The RPi would basically be locked aware and there would be cables going through the house from each device to a single RPi. For each device, there is a separate power source - 12V usually. Question: Am I supposed to use a differe...
by agraco
Wed Apr 06, 2016 2:25 pm
Forum: Raspberry Pi OS
Topic: Incredibly basic question
Replies: 5
Views: 1615

Re: Incredibly basic question

I asked this question elsewhere. I don't know why this worked, but it fixed the problem: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=142188&p=944849 I remain flummoxed that the problem was created in the first place...I mean if you create a folder I would presume that you have access to ...
by agraco
Wed Apr 06, 2016 2:05 pm
Forum: Automation, sensing and robotics
Topic: Technical question: Control LED strip from breadboard
Replies: 0
Views: 367

Technical question: Control LED strip from breadboard

Hi. So I am starting this project to control a 16 foot led strip from the breadboard. The final objective is to have a PHP website to control the colors, fade, on/off.... Project link: http://popoklopsi.github.io/RaspberryPi-LedStrip/#!/ LED Link https://www.amazon.ca/gp/product/B00M7MT5O6/ref=oh_au...
by agraco
Sun Apr 03, 2016 8:19 pm
Forum: Troubleshooting
Topic: Install HP Officejet 8620
Replies: 2
Views: 1898

Re: Install HP Officejet 8620

Took a while but finally got it thanks to your post. Thanks
by agraco
Sun Apr 03, 2016 8:17 pm
Forum: Troubleshooting
Topic: Save as error
Replies: 4
Views: 845

Re: Save as error

Thanks again :)
by agraco
Sun Apr 03, 2016 7:50 pm
Forum: Troubleshooting
Topic: Save as error
Replies: 4
Views: 845

Re: Save as error

Hi. I followed the instructions...and things seemed to have worked...but I get this error. I don't know if it matters. Anyways, thank you, pi@kwpi:~/Documents $ sudo chown -R pi.pi * pi@kwpi:~/Documents $ sudo chmod -R u+rwX, g+rX * chmod: invalid mode: ‘u+rwX,’ Try 'chmod --help' for more informati...
by agraco
Mon Mar 28, 2016 8:55 pm
Forum: Troubleshooting
Topic: Save as error
Replies: 4
Views: 845

Save as error

Hi. I have had this problem since I did the the install and I am wondering if there might be a solution. Directory: /Documents/Name Issue: when I click on "save as" and I navigate to the Directory, there is a permission Error. This is weird because I was allowed to create the folder in the first pla...
by agraco
Sun Mar 27, 2016 2:15 pm
Forum: Troubleshooting
Topic: Install HP Officejet 8620
Replies: 2
Views: 1898

Install HP Officejet 8620

Hi. I am having some trouble finalizing the install of my network (wifi) printer. Using cups, I was given a long list of printers to choose from. The printer list stops at the 7000 series (my printer model is around 2 years old). I went to HP, but the drivers for linux assumes I have Debian 7... I d...
by agraco
Wed Jan 06, 2016 3:30 am
Forum: General discussion
Topic: Help for headless
Replies: 9
Views: 2234

Re: Help for headless

SSH via PuTTY is CLI only. As mentioned use VNC or RDP to get a GUI session. I use XRDP Thank you. I had tried every other link to no avail. Your sentence about putty not being relevant really helped focus my attention. I think that a Raspberry is like cooking. We need a Ricardo of Raspberry to com...
by agraco
Wed Jan 06, 2016 1:45 am
Forum: General discussion
Topic: Help for headless
Replies: 9
Views: 2234

Re: Help for headless

AndyD wrote:I assume when you say "I can't open the OS." that you want to display the Desktop on your laptop. Is that correct?
correct. I am looking for the Raspian windows environment from within Putty (if that is even possible).

thanks for the links, I am starting to look at them

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