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by danpeirce
Sat Aug 25, 2012 8:12 am
Forum: HATs and other add-ons
Topic: Add-on tutorial
Replies: 9
Views: 2347

Re: Add-on tutorial

Guess I'm being over cautious as I've waiting so long for a Pi, and I don't want to wreak it ;-) I have a 2nd R-Pi and a spare on order but don't expect to see them till October. I am not taking any chances with the gpio until I have a spare on hand. Even then I envision these pins being most usefu...
by danpeirce
Sat Aug 25, 2012 1:38 am
Forum: For sale
Topic: Solarbotics to sell Acrylic Raspberry Pi enclosure
Replies: 38
Views: 16305

Re: Solarbotics to sell Acrylic Raspberry Pi enclosure

Purchased the Solarbotics Raspberry Safe enclosure. Very nice! The "Tetris Clip" does hold the Raspberry Pi in place. :D I went for the light blue version so the Raspberry Pi would be as visible as possible. Nice to clearly see the board inside and the logo on the board. There appears to be enough o...
by danpeirce
Thu Aug 23, 2012 7:39 am
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3498
Views: 84370

Re: Introduce yourself!

I am Dan Peirce from Surrey/Richmond/Langley BC, Canada. Currently I am working as physics lab technician at Kwantlen Polytechnic University. We have four campuses. We offer first year Engineering courses including one that involves programming PIC microcontrollers in C language. That course (APSC12...
by danpeirce
Thu Aug 23, 2012 6:14 am
Forum: Beginners
Topic: Win32DiskImager
Replies: 22
Views: 13561

Re: Win32DiskImager

Just thought I would add that our windows 7 laptop was able download images to SD cards but could not read the cards correctly to make backup images. It would appear to work but the resulting image file was only 57MB whick clearly was not a proper image file. On a whim I tried doing the backup on a ...
by danpeirce
Tue Aug 21, 2012 6:05 pm
Forum: HATs and other add-ons
Topic: soldering irons suitable for Gertboard?
Replies: 23
Views: 7462

Re: soldering irons suitable for Gertboard?

I have used a solder station with a controlled tip temperature for so long I can't imagine using one that is just free running; especially not on a PCB. If I were getting one today I might get the Weller WES51 http://www.amazon.ca/Weller-WES51-Analog-Soldering-Station/dp/B000BRC2XU $125-$135 is a lo...
by danpeirce
Tue Aug 21, 2012 5:26 pm
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

Question, what if i want buy an LED strip which i normally can put in my electric socket at home? how i use this on my GPIOs? cut off the cable in mid and put it on the GPIO(with the necessary resistors) and how do i know which resistor i should take(i know there is a formular for calculationg it X...
by danpeirce
Tue Aug 21, 2012 5:12 pm
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

oh ok, im not a hardware specialist ;) i think i will get the gertboard. Already heard of a RasPiComm board, which is also an Extention for the Raspberry Pi http://amesberger.wordpress.com/2012/08/02/raspicomm-a-raspberry-pi-piggy-back-board-12/ Dunno atm which one is better for me and my project i...
by danpeirce
Tue Aug 21, 2012 12:33 am
Forum: Staffroom, classroom and projects
Topic: Fond memories
Replies: 42
Views: 9551

Re: Fond memories

By the time I graduated high school in 1979 I had not had access to any computers. :( As an Electrical Engineering student at the University of Alberta (Canada) my first introduction to computers was on video display terminal connected to an amdahl mainframe which was on the other side of the campus...
by danpeirce
Sun Aug 19, 2012 8:41 am
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

network_connections_home.png what would be the best for my different projects i wanna try to make: 1) Turn Light(LEDs /LED strips) on/off via Smartphone or Computer(LAN/WLan) .....[snip] [snip]..... for now I am sidestepping using the GPIO. Instead I am connecting a PIC to an inexpensive ftdi board...
by danpeirce
Sun Aug 19, 2012 12:54 am
Forum: Staffroom, classroom and projects
Topic: Good beginners guide to electronics?
Replies: 8
Views: 17627

Re: Good beginners guide to electronics?

Maybe having a look at the source code for spice. It does use differential equation solving and deals with large matrix algebra. But as it simulates, and spice models for components are available, the general principals such as ohms law, capacitance, inductance, impedance, amplification, the power ...
by danpeirce
Sat Aug 18, 2012 11:26 pm
Forum: Staffroom, classroom and projects
Topic: Good beginners guide to electronics?
Replies: 8
Views: 17627

Re: Good beginners guide to electronics?

Some resources on basic electronics http://www.clear.rice.edu/elec201/Book/basic_elec.html --- very basic http://www.electronics-tutorials.ws/ -- start with the DC link You will want to try some of the circuits. I'd start with simulations to try the circuits in the tutorials (you can cover a lot mor...
by danpeirce
Sat Aug 18, 2012 6:37 pm
Forum: Staffroom, classroom and projects
Topic: Good beginners guide to electronics?
Replies: 8
Views: 17627

Re: Good beginners guide to electronics?

...Unfortunately, there is no easy (that I know of) manual to teach myself electronics and hardware building. I know the basics of soldering, that electricity is AC/DC and it's the current that kills. That's about it. Are there any books that you'd recommend to a beginner such as myself? I'm lookin...
by danpeirce
Fri Aug 17, 2012 6:33 pm
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

The PIC and the AVR are very similar. You can use an AVR without a crystal too. It's been ten years since I programmed a PIC, so I might be out of date, but at that time the only compilers you could get, you had to pay for, whereas the AVR uses the Gnu compilers. That is because all the AVRs have 3...
by danpeirce
Fri Aug 17, 2012 5:52 pm
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

Also consider an arduino only uses about 30 mA - raspberry Pi is much more power hungry - 20x more at 700mA Keep in mind that the Raspberry Pi has a 700 MHz clock compared to the Arduino 16 MHz clock. That gives a ratio of 43 times. Clock speed and power consumption are related. The Raspberry Pi al...
by danpeirce
Fri Aug 17, 2012 7:51 am
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

@danpeirce i've seen in your picture that u use this ftdi & PIC for extra hardware access(I/O)? or ´what exactly are this 2 items? i was thinking about getting a gertboard for more GPIO For people like myself who already have development tools for working with Microchip PIC devices and are already ...
by danpeirce
Fri Aug 17, 2012 6:28 am
Forum: Automation, sensing and robotics
Topic: Where to start
Replies: 5
Views: 1482

Re: Where to start

I am also a newbie. Does anybody know a good link or even a book where to start, read up, get ideas and excitement? I am Linux savvy, but know almost nothing about electronics. ed. Taking your comment and your question at face value I would say that basic circuit theory is essential to understandin...
by danpeirce
Thu Aug 16, 2012 6:42 pm
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

network_connections_home.png what would be the best for my different projects i wanna try to make: 1) Turn Light(LEDs /LED strips) on/off via Smartphone or Computer(LAN/WLan) 2) Play music from Smartphone(with WLan) where the Signal Revceiver(Rasp Pi/ or µC) plays the music on my SoundSystem 3)Conn...
by danpeirce
Thu Aug 16, 2012 8:31 am
Forum: Staffroom, classroom and projects
Topic: RasberryPi vs Arduino ? Differences so far?
Replies: 35
Views: 25232

Re: RasberryPi vs Arduino ? Differences so far?

The raspberry pi can run a lot of off the shelf software that will never run on an Arduino. Not only that the $35 price includes the ethernet port. A Ethernet shield for Arduino costs more than the Pi. The Pi also includes two USB host ports. It also includes an SD card slot. My Android tablet cost ...
by danpeirce
Mon Aug 06, 2012 7:11 pm
Forum: Advanced users
Topic: Running with Power port unplugged
Replies: 68
Views: 16723

Re: Running with Power port unplugged

When I started reading this topic I was really in a state of disbelief so I started looking for documentation that had something to say about it. There are hints on a variety of web pages that some self powered hubs do provide reverse current when the host is powered down and the hub is powered up. ...
by danpeirce
Mon Aug 06, 2012 7:44 am
Forum: General discussion
Topic: RasPi power usage measurements ALL Models
Replies: 156
Views: 274269

Re: RasPi power usage measurements ~2 watts at idle

With the new firmware I measured 0.107 A after shutdown -h now. Then I waited 15 for the temperature to re-equilibriate and took this picture: http://i.imgur.com/3tjaG.jpg Looks like the LAN chip is still drawing quite a bit of current. Nice image. That does seem like a great deal of power once the...
by danpeirce
Fri Aug 03, 2012 6:20 am
Forum: Networking and servers
Topic: How to install an FTP server
Replies: 6
Views: 11359

Re: How to install an FTP server

plmkr wrote:Start SSHD ( for example from raspi-config on newest raspbian )
and use SFTP over SSH ( Login with login pi password raspberry )

Much more secure then FTP. No need to install other software on rPi
Exactly the info I was looking for :D
by danpeirce
Thu May 10, 2012 7:24 pm
Forum: Staffroom, classroom and projects
Topic: Why Pi when you can just run Linux?
Replies: 98
Views: 20196

Re: Why Pi when you can just run Linux?

Since there is a HDMI on my Andriod I just purchased I don't think HDMI is going to go away in the next few years.
by danpeirce
Thu May 10, 2012 5:28 pm
Forum: Staffroom, classroom and projects
Topic: Teaching Real-time Systems
Replies: 14
Views: 6237

Re: Teaching Real-time Systems

<t>It would seem to me one would offload low latancy real world interfacing onto a MCU connected to the RPi via SPI or I2C and use the RPi for the networking/mass storage/HumanInterface.<br/> <br/> We have been using PIC18F4525s for some years with students to control simple robots. I think we would...
by danpeirce
Thu May 10, 2012 10:30 am
Forum: Staffroom, classroom and projects
Topic: Why Pi when you can just run Linux?
Replies: 98
Views: 20196

Re: Why Pi when you can just run Linux?

<t>davidmam said: <br/> <br/> <br/> The real advantage with RPi over just running Linux is the form factor and acessibility to hardware. Ideally a RPi case for schools will expose the GPIO header via a convenient (and protected to prevent bricking of the board) set of connections on the case. This w...

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