Let's Make Robots!

The Climber - Third ride - It works!!!!!

Climb stairs

Hi guys !

I'm working on a robot from plywood. He should the stairs up and down ride.

He receives four strong (12kg/cm) servos modiefied for continuos rotation and one Sharp IR and probably two bumper switches.

My first Climber was finished, but he had two problems:

- first and last stair, so I had to change the design.

I hope that now everything is good.


 24 June 2009 - First ride

Without sensors.


 25 June 2009 - Second ride

 

He is too heavy!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 


 26 June 2009 - Third ride

 It works!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

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I think this is a very nice design but your problem is not weight or power but traction, you need more wheels.

here is a video of a similar robot that has overcome the problem with more wheels:
http://www.youtube.com/watch?v=mW4LJW6j05E&feature=channel_page

For the first couple of seconds just make the back wheels a little bit faster than the front.

(or the other way not quite sure of my logic)

The wheels appear to have enough traction - maybe it just needs more "Push behind" than "Pull infront" for the first part or visaversa.

once its underway (maybe by tilt switch) it can revert to same speed back and front.........

This is good but how can I do that? I can not change the speed. These are digit servos. I can only servo position change.
 
init:
servo 4,75 ‘ initialise servo
main:
servopos 4,75 ‘ move servo to one end
pause 2000 ‘ wait 2 seconds
servopos 4,225 ‘ move servo to other end
pause 2000 ‘ wait 2 seconds
goto main ‘ loop back to start

You should set more weight on the backend.... i think.

 

Then the front end should be leighter than the front end and the will push it up at the first step :)

Hope it helps...

no, that would totally stop it at the last step!

it need more weight on the middle!

AND as you said, the wheel need to be lighter!

you 're right. I have to invent something else.
get motors with more torque that way you have more power to deal the the whole gravity thing
The servos are already strongly 12kg/cm.
Add another servo in the middle that has a weight on the end of a stick The servo shifts the weight back and forth according to the orientation of the robot, need an accel or tilt sensor to read orientation.
you 're right. I have to invent something else.