Let's Make Robots!

Reversing Robot

I was tempted to post this as a challenge, but I can't offer a prize. The deal is, you build a robot which can reverse a trailer round a 90 degree corner and then in a straight line.

I mean trailer (British) I have no idea what Americans call an articulated trailer, but I believe some of you may now be thinking I'm talking about mobile homes. No. Not an aluminium house on wheels.

Isn't that just a pot? You are forgiven for thinking you are looking at a photo of a potentiometer AKA variable resistor. That's what this looks like. However, if … Read more
Computer mice with balls contain two (or sometimes three, if the have a scroll wheel) rotary position sensors. These are not mechanical switches, but optical ones. … Read more

TCP/IP Idiot's Guide Required

OKay, who understands IP? I want a simple explaination as to why I can log into LMR with two different usernames from two different PCs in my house, when they're both attached to the same router. The router assigns them both unique non-routable IP addresses on the LAN side of my network.

If I log into two sessions on LMR using two usernames, the more recent of teh two connections takes over the older one and that session becomes the same as the new one.

Once the traffic passes through my router, it's almost as if my two PCs have two different IPs.

Follow me carrying a 30kg child.
Using a
    2008-05-18 The deal is, this 'bot will (hopefully) follow me around. For me the challenge is to do something bigger than Lego scale.   So far, I have … Read more
Learn from first principles how to select and program virgin PICs in RISC assembly.
Using a
What's one of those? A Microchip PIC is an example of a microcontroller. Basically, a tiny but very complete computer in a single chip. The PICs have their own … Read more

Microchip (PIC) RISC Assembler

For anyone who wants to try assembler instead of that girly BASIC stuff some folk are always raving about, this is the place.

RISC assembler programmed into PICs by In-Circuit Serial Programming using home-built programmers for under $20 is my thing.

Ask me questions.

Now, this maybe belongs under the 4 elements. Does it go under programming or electronics? Naw. I'd say it's another "system". Is anyone able or inclined to move it to that container?

What do you need?

Where do I get it?

It's a free download from Microchip. That's the nice people who will also send you the free engineering samples.

Quasar 2.4GHz Transceiver

Has anyone ever seen or used this Quasar 2.4GHz Transceiver Module (QFM-TRX1-24G) or anything similar?

I like the price. I'm considering ordering a couple as an inexpensive alternative for controlling my I2C bus.

Looks like it's based on this TI chip whose data sheet gives better info than the Quasar data sheet.