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by Ravenous
Thu Aug 06, 2015 12:26 pm
Forum: Off topic discussion
Topic: MeowCAD
Replies: 8
Views: 1336

Re: MeowCAD

and you bothered to reply why? No one is forcing you to try it i just thought that someone might like to give it a go in case they found it useful. I thought someone might like to give KiCAD a go in case they found it useful. Start your own thread if you want to do that & lip to a moderator is real...
by Ravenous
Tue Feb 24, 2015 10:52 am
Forum: Automation, sensing and robotics
Topic: Servos on I2C at start up
Replies: 3
Views: 615

Re: Servos on I2C at start up

Well my suggestion would be two power switches. One to a 5V regulator which drives the controller (raspi in your case), and another switch that provides power to the servos, motor drivers etc. Make sure the controller has booted and set its outputs appropriately, before enabling power to the motors....
by Ravenous
Tue Feb 24, 2015 10:43 am
Forum: Off topic discussion
Topic: Soldering with kids
Replies: 16
Views: 1862

Re: Soldering with kids

I was learning how to use a tiny MSR stove and forgot to follow one vital instruction: Leave for five minutes before packing away. Back on topic, I usually put my (cheap, fixed temperature) soldering irons in a plastic toolbox, so yes be careful to let them cool for a while before coiling up the ca...
by Ravenous
Tue Feb 24, 2015 10:33 am
Forum: Troubleshooting
Topic: I think i overvolted mi pi through the usb port
Replies: 5
Views: 796

Re: I think i overvolted mi pi through the usb port

I looked around and thought i had everything well soldered but i had a 5v line connected to D- (data) by a thin strand of solder and it was going into the pi Well I don't know if that will fry the rpi; it may, it may not. (5V directly into the raspi's SoC chip doesn't necessarily destroy it. Note I...
by Ravenous
Tue Feb 24, 2015 10:08 am
Forum: Off topic discussion
Topic: EZChip TILE-Mx100 is a Network Processor with 100 ARM Cortex
Replies: 5
Views: 913

Re: EZChip TILE-Mx100 is a Network Processor with 100 ARM Co

Not for release yet though. I mean, a year in the future we'll be able to buy 100 ARM 64 cores for an unknown price, but is this news yet?
by Ravenous
Mon Feb 23, 2015 4:44 pm
Forum: Off topic discussion
Topic: Mounting and Organization
Replies: 6
Views: 1101

Re: Mounting and Organization

You mean, mount the raspi (and maybe other bits) on PVC sheet? Yes, I'd say that should work fine.
by Ravenous
Mon Feb 23, 2015 1:33 pm
Forum: Beginners
Topic: How do I control 16 motors independently?
Replies: 15
Views: 1938

Re: How do I control 16 motors independently?

As Texy indicates, reversing the motors needs a more complicated motor driver - an H-bridge. That's needed because reversing the current flow through the motor needs more stuff than just an on/off control. Also to reverse you will probably need an extra control output per motor. (Unless... the motor...
by Ravenous
Mon Feb 23, 2015 11:36 am
Forum: Off topic discussion
Topic: Soldering with kids
Replies: 16
Views: 1862

Re: Soldering with kids

(But at least they're Lead Free!)
by Ravenous
Mon Feb 23, 2015 10:05 am
Forum: Off topic discussion
Topic: Soldering with kids
Replies: 16
Views: 1862

Re: Soldering with kids

Goggles, good stout stands and the cables should be well away from any possible snag hazards. I was a bit surprised when someone disagreed with this, because in my experience all of these things have caused mishaps. I've had solder flux "spit" and throw stuff into the corner of my eye. Only happene...
by Ravenous
Mon Feb 23, 2015 9:48 am
Forum: Off topic discussion
Topic: Locked threads
Replies: 24
Views: 2752

Re: Locked threads

Yeah, what if the original builder of a project wants to come back a year later with an update of how it went, and any revisions? I'm sure there have been a few threads like that.

(Admittedly most ancient thread resurrections aren't so useful, but a few are.)
by Ravenous
Fri Feb 20, 2015 12:37 pm
Forum: Graphics, sound and multimedia
Topic: 8bit computer simulation project
Replies: 5
Views: 1292

Re: 8bit computer simulation project

That looks like a good piece of work!
by Ravenous
Fri Feb 20, 2015 12:27 pm
Forum: General discussion
Topic: How much does actually Pi 2 cost?
Replies: 33
Views: 4822

Re: How much does actually Pi 2 cost?

I think you can be assured that they have reserves and are spending the money wisely. :D EDIT: If you go to their blog page and spend some time reading up on their various educational and business activities, I'm pretty sure you'll find they are a fair-sized organisation and have bee operatign for s...
by Ravenous
Fri Feb 20, 2015 11:31 am
Forum: General discussion
Topic: How much does actually Pi 2 cost?
Replies: 33
Views: 4822

Re: How much does actually Pi 2 cost?

Let's not start that again :D

Please :lol:
by Ravenous
Fri Feb 20, 2015 11:16 am
Forum: Off topic discussion
Topic: Mounting and Organization
Replies: 6
Views: 1101

Re: Mounting and Organization

For all of my old Model As, I just mounted them on old "6BA" sized bolts, with spacers. (They're a bit narrower than M3 bolts and fit fine.) For the newer raspberries the mounting hole size might be different...? (I don't know if anyone knows of any PCB standoffs that fit nicely?) Whatever you use, ...
by Ravenous
Fri Feb 20, 2015 10:40 am
Forum: General discussion
Topic: How much does actually Pi 2 cost?
Replies: 33
Views: 4822

Re: How much does actually Pi 2 cost?

I'm also curious about how much is the parts of Pi 2, like CPU, RAM, USB port and sort, and how does the Pi Foundation profits from the tiny computers? We'll never know exactly. You might be able to use the Charity Commission figures Rattus linked, to estimate the profit they make per board. But th...
by Ravenous
Thu Feb 19, 2015 3:04 pm
Forum: General discussion
Topic: Windows 10 commercial usage license
Replies: 15
Views: 3573

Re: Windows 10 commercial usage license

2) Someone has already used Raspberry for industrial purposes? Pros and cons? Sorry, in all the excitement I forgot to mention this. Some people have used it. The foundation have said before they don't mind you building RPis into hardware which you then sell, as long as you don't actually try to tr...
by Ravenous
Thu Feb 19, 2015 2:18 pm
Forum: General discussion
Topic: Windows 10 commercial usage license
Replies: 15
Views: 3573

Re: Windows 10 commercial usage license

For all practical purposes, there is no Windows for the Pi. And there won't be for the foreseeable future. You are wrong: https://dev.windows.com/en-us/featured/raspberrypi2support Didi, be aware that that page you are pointing to is not talking about Windows 10 Desktop. It may be talking about Win...
by Ravenous
Thu Feb 19, 2015 1:37 pm
Forum: Automation, sensing and robotics
Topic: Motor control code
Replies: 10
Views: 1506

Re: Motor control code

Thanks, good to know the simple resistors work without affecting things.

Another thing I forgot to suggest (very forgetful today) is you can always test the motor + driver separate from the raspi - disconnect the raspi completely and use wires to put +V and 0V to each input as necessary.
by Ravenous
Thu Feb 19, 2015 12:15 pm
Forum: Automation, sensing and robotics
Topic: Motor control code
Replies: 10
Views: 1506

Re: Motor control code

D'oh, yes 2 seconds then. :oops: For the OP, another way to test the logic levels at the inputs, maybe wire an LED and resistor (500 ohms-1K?) and connect that between each input and ground. Would this work, or would it just pull down the inputs? (I use a cheapo Logic Probe for this, but that's no u...
by Ravenous
Thu Feb 19, 2015 11:21 am
Forum: Off topic discussion
Topic: Raspberry Pi PCB supplier
Replies: 9
Views: 1225

Re: Raspberry Pi PCB supplier

PCB In other words, you want the board itself, and NOT the entire Raspberry Pi. (Pretty sure one person misread this.) That's presumably down to the manufacturer, whether they get the bare boards from a contractor or in-house I have no idea. We have seen pics of them on the "factory tour" news bits...
by Ravenous
Thu Feb 19, 2015 11:08 am
Forum: Automation, sensing and robotics
Topic: Motor control code
Replies: 10
Views: 1506

Re: Motor control code

Possibly stupid question as my head is a little fragile today - does sleep(2) mean 2 seconds, or 2 milliseconds?

(If so, that's the problem - if not, ignore me and I'll go back to sleep :lol: )
by Ravenous
Fri Feb 13, 2015 5:57 pm
Forum: Troubleshooting
Topic: A+ killed by a L298N
Replies: 42
Views: 4405

Re: A+ killed by a L298N

Maybe you could try Ni-Mh cells instead... They're only 1.2V each but they seem to deliver higher currents. (Beware of short circuits, you can burn the insulation off the cable.) And keep the weight down as much as possible. I should point out mine is very different to yours, mechanically. (I origin...
by Ravenous
Fri Feb 13, 2015 5:12 pm
Forum: Troubleshooting
Topic: A+ killed by a L298N
Replies: 42
Views: 4405

Re: A+ killed by a L298N

Oh, also as Joan says, more voltage on the battery will help turning too. I've never used the L298, only the much smaller L293D (though with both sides wired in parallel), and they are enough for quite a heavy robot at 12V! I really think your L298 is good enough. Also - your diagram shows 6 alkalin...
by Ravenous
Fri Feb 13, 2015 4:51 pm
Forum: Troubleshooting
Topic: A+ killed by a L298N
Replies: 42
Views: 4405

Re: A+ killed by a L298N

Actually, I have the ENA and ENB jumped and my robot tank doesn't even have power to change direction. It can only goes straight or reverse. With tank tracks, they sometimes "dig" into a carpeted surface and you need a lot of torque to turn. Two wheels is far better sometimes! As you say it might b...
by Ravenous
Fri Feb 13, 2015 3:19 pm
Forum: Other projects
Topic: Heatsink
Replies: 12
Views: 1494

Re: Heatsink

Have you considered the effect of expansion and contraction of that paraffin? (Especially if the paraffin starts to solidify at lower temperatures... don't use it if it does.) There is a chance of random (and permanent) failures caused by fatigue of the solder joints. I suggest you run a few hundred...

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