Let's Make Robots!

Gareth's new dinner table?

For some reason, it made me think of Gareth and his "Theo legs"...

"Excuse me, waiter, can I get this to go?" ;^>


Scaling down a boat to make USV

I have been dealing with asects of theis for a while and this is my latest idea. Build a small plywood boat downsized to be a platform for robotics testing. I bought a "partially built kit" on eBay that turned out to be an abandoned upgrade of a hobby grade boat. It's a 15" V narrow plastic V-Hull and I am concerned about it being to close to max with a decent battery and gear in it. But the upgrade in process inculded a good servo steered rudder and through hull prop hardware. The supplied motor is marginal but workable. I have a brushed ESC with 5v BEC.

TED talk invitation to Frits

He announced this in the Shout box:

fritsl: I was just invited to do a TED talk. Not sure, any input from you guys appreciated :)

and I hope I am not being too presumptious by opening a topic so this doesn't get lost in the shout box.

I absolutely think he should do it. Some shouts:


uses data radios to transmit and receive joystick and button info
This will get used for a small boat project (not the big boat project I work on; something to help with testing things for it).  Out in the street this is testing … Read more

super cheap video recorder


Anyone tried one of these (or similar):


I am tempted to get one. Around $8 to the US. I would just about double my investment putting a micro SD card in it. I would really like to find it as a component that cheap, but I haven't seen one. I guess I could rig a servo to press the power button and then the record button.

Trying to regulate 5v from 7.4v

I have a LM2930S-5.0:


in this mess:

I have a cap across the input and a resistor in line on the output (it was 6.8 before I added the resistor).

Yes, it is a cheap meter, but measuring VCC on a Mega I get 5v and on a Fio 3.3v. It is reasonably accurate.

What am I doing wrong? I don't want to smoke my 5v uC. The VR should be putting out 5v (datasheet says 5.5v max).

Can I recharge a shared battery?

I just started messing around with a little RC boat (yet another way to emulate and test things for the bigger boat project I am part of) and it is getting the Fio that had been the brain in my AGV before I upgraded it. Anyway, the boat is small enough that to limit size and weight, I am going with one of those scary ol' LiPo batteries. One nice feature of the Fio is that it has an on board LiPo charger that will charge a 7.4v.