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by exartemarte
Sat Jan 04, 2014 5:45 pm
Forum: Camera board
Topic: Raspberry Pi Camera Board with CS mount Lens
Replies: 61
Views: 35802

Re: Raspberry Pi Camera Board with CS mount Lens

DougieLawson wrote:What happens when the folks you write to reply with a reference to the reply from Pressdram in the case of Arkell vs Pressdram, 1971?

I'll let you look it up.
Thanks for that - I needed a chuckle!
by exartemarte
Tue Dec 31, 2013 12:40 am
Forum: Beginners
Topic: ir gpio need help
Replies: 6
Views: 940

Re: ir gpio need help

If it was used with a PC serial port you could try a USB/serial converter like this. They are very cheap on eBay. I have a couple of them, and although I haven't tried them on a Pi I have used them successfully with Debian Linux on PC and laptops - didn't even have to install a driver.
by exartemarte
Mon Dec 30, 2013 1:47 pm
Forum: General discussion
Topic: Cheap base for RaspberryPi
Replies: 25
Views: 3933

Re: Cheap base for RaspberryPi

I have used several of the bottom-half-of-a-case solutions. My preference is the SB Components case - it's small and neat, the walls are quite low and the Pi clips securely into the base. And if you do use the top half, it's got apertures for just about everything including a nice wide one for the G...
by exartemarte
Sat Dec 21, 2013 11:20 pm
Forum: HATs and other add-ons
Topic: SD card sticking out ? Use RSMMC
Replies: 56
Views: 33110

Re: SD card sticking out ? Use RSMMC

IseMan wrote:Not sure if anyone is still interested or if I missed this being posted (reading on an iPhone) but I found this and am rather tempted to try it...
http://www.amazon.com/gp/aw/d/B00AKO3EVS
Looks like the Adafruit one - on the Adafruit website it's only $5.95.
by exartemarte
Sat Dec 21, 2013 8:20 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Driving 2 DC motors using L293D
Replies: 35
Views: 37062

Re: Driving 2 DC motors using L293D

mikronauts wrote:WiringPi also has a soft PWM that can control multiple pins; I used it last week with a L293D - it would also work with the L298
Good point - we're spoiled for choice. I'm using wiringPi for the Pi end of my Pi/Arduino/SPI setup.
by exartemarte
Sat Dec 21, 2013 9:46 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Driving 2 DC motors using L293D
Replies: 35
Views: 37062

Re: Driving 2 DC motors using L293D

LaWFuLEviL wrote:I came across this post which shows L293D with two motors and one PWM : http://roverpi.blogspot.com/2013/07/con ... -with.html
Yes, that's the sort of thing I was suggesting.
by exartemarte
Fri Dec 20, 2013 11:43 pm
Forum: Automation, sensing and robotics
Topic: Reading TCRT5000 ir sensor
Replies: 5
Views: 7851

Re: Reading TCRT500 ir sensor

Hi. I have some ir sensors that I'm trying to read, for use in a line-following robot. I have tried a few configurations and am using a thick black line on a piece of paper as a test sample. I have the ir led connected to GND & 5V (via 470R resistor), the emitter to GND, and the collector to 3v3 vi...
by exartemarte
Fri Dec 20, 2013 2:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Driving 2 DC motors using L293D
Replies: 35
Views: 37062

Re: Driving 2 DC motors using L293D

How do you use the L298N H-Bridge to control two motors from one PWM pin on RPi ???? I probably wouldn't - see below. The little buggy in the picture is using an Arduino Nano, with multiple pwm's, and an L293D. What I had in mind when I answered the question above was just to combine the enable inp...
by exartemarte
Wed Dec 04, 2013 11:43 am
Forum: Automation, sensing and robotics
Topic: Arduino/Pi Robot
Replies: 29
Views: 30994

Re: Arduino/Pi Robot

I'm also looking to build a R-Pi / Arduino robot. [...] Anyone have this up and running already? Not yet, but I'm currently struggling with a Pi/Arduino combo using SPI which, if I get it doing what I want, should suit all of my robotics projects even though it would be a bit OTT for some of them. ...
by exartemarte
Mon Nov 25, 2013 5:55 pm
Forum: C/C++
Topic: Geany - accessing samba shares on a Pi
Replies: 2
Views: 1636

Re: Geany - accessing samba shares on a Pi

Thank you for the reply - I'll try that and let you know how I get on.
by exartemarte
Sat Nov 23, 2013 1:04 am
Forum: C/C++
Topic: Geany - accessing samba shares on a Pi
Replies: 2
Views: 1636

Geany - accessing samba shares on a Pi

Hi Has anyone managed to get Geany, running on a PC or laptop, to access files stored in Samba shares on a Pi? What I want to do is use a straightforward editor on a laptop to edit program files on a headless Pi via Samba. I've been doing this ever since I first had a Pi using my preferred editor, P...
by exartemarte
Sun Nov 10, 2013 10:28 am
Forum: Raspberry Pi OS
Topic: Scripting help
Replies: 30
Views: 5806

Re: Scripting help

Unless I've missed something, this does seem to be an over complicated solution to a simple problem. Why use an external device to switch a Pi on and off when the Pi can run 24/7, using very little power, and do what you want whenever you want it done? (If you needed a device to switch something on ...
by exartemarte
Thu Nov 07, 2013 12:52 pm
Forum: General discussion
Topic: Additional USB, LAN, Serial ports
Replies: 30
Views: 8251

Re: Additional USB, LAN, Serial ports

Mine was a Nascom. I liked Z80 - although at the time it was all I knew. Got to know 6502 later, through the Beeb.
by exartemarte
Thu Nov 07, 2013 12:27 pm
Forum: General discussion
Topic: Additional USB, LAN, Serial ports
Replies: 30
Views: 8251

Re: Additional USB, LAN, Serial ports

bob.green wrote:My first computer actually had to be assembled and every component soldered in place.
Might that have been a Nascom by any chance?
by exartemarte
Wed Nov 06, 2013 1:21 pm
Forum: Networking and servers
Topic: Using the Belkin N150 as a Wifi adapter
Replies: 2
Views: 2105

Re: Using the Belkin N150 as a Wifi adapter

Plug it in. There's a program for configuring wifi on the Pi LXDE desktop, called wpa_config or something like that, which will scan for wireless networks, let you configure the security, and connect. You will need to know the SSID (name) and encryption password for your router. I have done this suc...
by exartemarte
Fri Nov 01, 2013 5:08 pm
Forum: General discussion
Topic: Additional USB, LAN, Serial ports
Replies: 30
Views: 8251

Re: Additional USB, LAN, Serial ports

I like it. It's on the bulky side - you probably wouldn't want it permanently connected to your Pi - but I just used the LAN port, which worked out of the box, to ssh into a new model A and install wifi without benefit of a monitor. Quick, easy and convenient.
by exartemarte
Wed Oct 23, 2013 1:26 pm
Forum: General discussion
Topic: Additional USB, LAN, Serial ports
Replies: 30
Views: 8251

Re: Additional USB, LAN, Serial ports

Scan still have these as at today (23 October). I ordered a couple at 10:55 and they were marked as despatched at 12:50. I haven't bought from Scan before, but so far I'm impressed.
by exartemarte
Sun Oct 20, 2013 1:36 pm
Forum: Automation, sensing and robotics
Topic: One wheel quicker/more powerful than the other
Replies: 46
Views: 9574

Re: One wheel quicker/more powerful than the other

There is a circuit here that will do what you want, with an explanation of how to use it. You could build the circuit yourself using the components I suggested (from ESR) or buy the buy the Pololu unit ready built (from HobbyTronics in the UK). That pretty much exhausts the advice I have to offer. W...
by exartemarte
Sun Oct 20, 2013 12:08 pm
Forum: Automation, sensing and robotics
Topic: One wheel quicker/more powerful than the other
Replies: 46
Views: 9574

Re: One wheel quicker/more powerful than the other

I see! So I could do it how you do, and keep switching resistor until the sensetivety is right, or I could put an infra-red LED where my white led it and the phototransistor where my LDR is. This would be the setup: 3V3 -> 330 ohm resistor -> Infra-red LED -> GND 3V3 -> 680 ohm resistor -> phototra...
by exartemarte
Sat Oct 19, 2013 11:24 pm
Forum: Automation, sensing and robotics
Topic: One wheel quicker/more powerful than the other
Replies: 46
Views: 9574

Re: One wheel quicker/more powerful than the other

Which phototransistor did you use? It has to be a phototransistor that is 0 when it's over black paper lit up by a white LED and 1 when it's over white paper lit up by a white LED. I think you have misunderstood how a phototransistor works. For what it's worth, I use the 3mm standard phototransisto...
by exartemarte
Sat Oct 19, 2013 2:51 pm
Forum: Automation, sensing and robotics
Topic: One wheel quicker/more powerful than the other
Replies: 46
Views: 9574

Re: One wheel quicker/more powerful than the other

But I don't know how sensitive the phototransistor should be. It might conduct even with he black line under it because the black line reflects a bit of light, or maybe the white isn't bright enough to trigger it. Also, what if two of the transistor are off (meaning they both have the black line un...
by exartemarte
Sat Oct 19, 2013 1:23 pm
Forum: Automation, sensing and robotics
Topic: One wheel quicker/more powerful than the other
Replies: 46
Views: 9574

Re: One wheel quicker/more powerful than the other

Line sensing is not a demanding application and can be accomplished with quite cheap, simple hardware. The level of control and precision provided by Schmitt triggers with adjustable thresholds is very nice but is not, in my opinion, strictly necessary. A project using very simple, home-brew infra-r...
by exartemarte
Wed Aug 28, 2013 10:55 am
Forum: General discussion
Topic: CPC = Epic
Replies: 3
Views: 902

Re: CPC = Epic

I have a good experience of buying from CPC; the only downside is that once you're on their books they send you an endless stream of catalogues which, eventually, just become irritating junk mail.
by exartemarte
Fri Aug 09, 2013 3:14 pm
Forum: General discussion
Topic: Micro USB power lead to open wires?
Replies: 13
Views: 5772

Re: Micro USB power lead to open wires?

I think I would just cut a micro-usb cable in half rather than spend time searching for one. Even if you find a source I doubt if you'd save any money by the time you'd paid the postage and packing. Yes, you can power the Pi via the 0v and 5v pins in the GPIO connector - with 5v, obviously - but don...
by exartemarte
Wed Jul 10, 2013 7:28 pm
Forum: Troubleshooting
Topic: broken sd slot
Replies: 13
Views: 3724

Re: broken sd slot

You can also get the exact replacement SD card slot part on eBay too - do a search for 'raspberry pi sd card slot'. Thank you for that link - I've bought some. I'm not keen on these sockets because they break so easily, but they have the advantage of being able to accommodate the micro-sd adapter b...

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