Doug's Blog
Random thoughts on IT, Radio, Scouting and other topics....
All Electronics Software Security Personal Scouting

Tue, 02 May 2006

Pic 16F84 Based Temperature Logger

I have also updated the temperature datalogger.

The circuit diagram is now there.

http://www.drj-electronics.com/projects/articles/templog/index.html

[/Electronics] permanent link

Pic 16F84 Dual LED Dice Project

I have updated the project page for my PIC based LED Dice project.

It can be found here. No more dead links.

http://www.drj-electronics.com/projects/articles/leddice/index.html

[/Electronics] permanent link

Google searches are a mystery

I have discovered something interesting..

1) Google are sweeping my site.

2) My site has a set of project pages, one of which is a simple PIC based temperature logger.

If I do a search on Google for 'extremely simple temperature data logger' 'PIC16F84 and a DS1820' which are 2 valid terms on the temperature logger page, I don't get any response.

Does this mean that Google don't bother traversing into a site, and that they only look at front pages????

Possibly Mikal will be able to shed some light onto this.

<< Update - I have moved my Blog to Blosxom and are now using static generation - That may help >>

[/General] permanent link

The Mythical Man Month

I re-read this old favourite the other day (The Mythical Man Month - Brooks - ISBN 0-201-83595-9)

While it is basically a software project management book, it can be applied in most other disciplines. The simple rule that doubling the staff does not mean that the project will be delivered in half the time is so true.

Much of its contents is also touched on in a different and quite funny manner in - Down the Programmed Rabit-Hole [Anthony haden-Guest] The surprising revalation I saw was that books written in the mid to late 60's about systems engineering STILL APPLY - even now. Oh, how our discipline needs to grow up. Another interesting question, is how does this apply to civil engineering, and why do they get it right most of the time? This is an area that operates in a similar manner to software engineering, except that the bugs are deadlier. Is it simply that the typical civil engineers management knows that they can't build a bridge, and therefore they don't try? I suspect that this may be the case.

It was refreshing to see my old friends at a previous employer fall into all of the well documented traps - They were just too busy to get out of them.

[/Software] permanent link

Bernina Sewing Machine - Embroidery - External USB Hard Disk

I have sorted out how to add an external hard disk to a high end Bernina sewing / embroidery machine. It runs windows CE (an *old* version), and the USB support is a little suspect unless you have paid Bernina some cash for an upgrade (what an interesting, mainframe based, business model.)

Just buy an external USB hard disk enclosure, and a suitable drive (we used a 6gb one I had lying around), plug it into the bernina and power on (hot swapping would have been too simple for them) and let the Bernina format the disk - should take about 20 - 30 minutes. At this stage, your job is not done, as the Bernina machine fails to set up a suitable partition on the drive...

Once that is finished, plug the drive into your laptop or desktop windoze system, and use computer manager to create a FAT32 partition. Format that and Bob's your auntie... It will all fly.

Do not use NTFS... The version of windows CE that Bernina uses does not recognise NT partitions, so that will surely fail. It wont be recognised by the Bernina, and it will offer to re-format the drive. If that happens, just let it do it's thing, unplug it and set up a FAT32 partition.

Have fun, and remember that you don't need to pay the stupid amount of money to Bernina for their overpriced hard disk.

Doug. - Who's Mum owns a Bernina machine that in spite of its design flaws (it overheats..) still loves it.

[/General] permanent link

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