Let's Make Robots!

finding cheap RC ESC (speed controller)

I love RC ESCs. They are electronic speed controllers that you connect to a servo output on a RC receiver or a micro controller, and they give you full step free control over a big motor in both direction. Most of the ones made for RC cars work in the voltage range 6-8.4Volts, but there are several alternatives for people who plan to run up to 24 volt motors in almost constant stall at a gazzilion amps (read robot war contenders).

But I'm the eternal cheapskate, and wants the cheapest there is.. So far I've found this 

Mr. Basic axles

This one goes out to those who participated in the first Mr. Basic Challenge.

The first batch of kits that DAGU Electronics sent out had some bad parts in it, and DAGU was quick to replace those parts, and the problem is fixed on the later releases.

 Now I wondered if anybody got 4 replacement wheel axles (2 fronts, 2 backs) and kept the old ones? You see I need those old ones...

So if anybody is willing to post'em to Norway, I'd be really grateful.

real shops in London

Does anybody know of any interesting robot parts shop in London town, UK?

I'm on my way there tomorrow on a business trip, and have time to kill.

I'd love to go into a shop and touch and feel stuff before I buy...

 

TallyHoe! Man Euver

ROV submarine

I playing with the idea of building a ROV.

A ROV is a Remotely Operated underwater Vehicle.

I plan to start simple, with a webcam connected to a computer, and 3 motors with propellers controlled by switches, all of it strapped to a frame of sealed plastic tubes. Something close to this instructable

But the robot geek in me wont stop there! I want to build:

A moisture sensor (to warn if the electronics compartment has sprung a leak) 

very fast grippers

This has to be the fastest robot hands I've seen...

http://www.break.com/index/ultra-high-speed-robot-reflexes.html

 

5v voltage regulation.

Is there a simple thingy that I can hook up to any voltage higher than 5V (within reasonable range) and always get 5volt out?

LMR DAGU Contest rules anyone?

Oddbot mentioned in another post that some rules would/should be announced regarding the LMR DAGU Contest.

I thought the rules were vaguely outlined as something like:

1 Use the Mr.Basic kit.

2 make sure your robot is way cooler than the other contestants.

3 good luck.

-So, do we need any more rules? Do everybody have to use all the parts from the kit? Which partscannot me excluded? Is there an upper price limit?

PWMOUT only on two output, that are really inputs?

Am I reading the manual (section 2, page 128) correctly? Can I only use the PWMOUT on 2 specific ports on my 28X1?

This would mean that I can't run more than two outputs with pwm, and that has to be the digital in/outs 1 and 2, so there's no hope of running it through the onboard L293D??

I must have missed something, surely there is a way around this. Pulsout maybe? I'm R'ing T. F'ing M. now, but if somebody already knows the answer, that would be helpful..

 

 


EDIT:

 

'Axe as RC speed controller

Would it be possible to connect the output from a RC reciever to the digital input of a pcaxe 28x1 board and controll the motor outputs?

Of course it's doable, that's not really the question. But does anybody have any thought regarding it? Has anybody done it? I presume the signal out from the RC reciever is a standard Servo-signal. I know CtCpassed a signal from a RC reciever through his 28x1, but I don't wanna controll servos,I wanna controll a couple of DC motors.

 

messing with the motor outs (A and B)

Just a thought:

(lets call the four motor outputs A1, A2, B1 and B2)

What would happened if I connected a GM10 (with the original spring still attached) between B2 and A2? Like in the illustration below

motorhead.jpg

I was hoping to achieve the following: