How to build the one motor walker!

Step 2 How to build the one motor walker!

This is main mechanical part you will need to make the robot.

You can find this sort of gear in VCR. Search garage sale or ask familly and friends.
The DVD is already obsolete thank to the BluRay, imagine how obsolete is the VCR! :P

The gear in the picture is from a VCR.

If you are really lazy, you can buy it from there
http://www.allelectronics.com/make-a-store/item/GR-5/SET-OF-5-GEARS-AND-BUSHINGS/-/1.html

Comments

[robomaniac]

Hello,

I got that gear from a VCR. You could check all electronics to get a gear like that

http://www.allelectronics.com/make-a-store/item/GR-5/SET-OF-5-GEARS-AND-BUSHINGS/-/1.html

[fa6oomi]

from where can I find the material for robot pllz :)

[psp3601]

You can get them at the store Addison of radio shack.

[robomaniac]

here

http://www.solarbotics.com/products/abgchw/

[sid_bet]

Hello Jerome , Can i use the h-bridge using the 2n3904 and 2n3906 from beam online instead of the bicore ? Also do i have to insert a nail as in the last step . because the gear motor does not have a stop tab . Thanks.

[robomaniac]

hello, You need the bicore circuit because this his the brain, it make the motor oscillate from left to right. You can have the bicore + h-bridge to give more power to the motor. But you need the bicore. The h-bridge is a power circuit with no brain. You give it a logical 1 to the input and it will give you a logic 1 at the output with more current. You can also call this a "buffer gate". The nail was just a solution to prevent the motor from over turning. It is a mechanical stop. You can try without a nail and see what it does. Instead of a nail you can use a elastic or a sping. Good luck! Jerome

[sid_bet]

hello jerome, I have a 74hct240 . so can i connect the outputs of the bicore to the inputs of the h-bridge for more power ? Or will it work without the h-bridge ? Thanks

[robomaniac]

YES! connect the output of the bicore to the input of the h-bridge. Your 74HCT240 does not give a lot of current. The HCT are like that. The AC are better for current. You could try directly with the HCT240, it might work depending of the motor you use. To test the h-bridge, tie one input to ground and the other input to 5V, the motor should turn one way. If you swap the input so that the ground is now 5V and the 5V is now ground the motor will turn the opposite direction. Jerome

[sid_bet]

hello jerome , I think i am a little confused about the wiring . while testing should i only attach power to the inputs or to the +ve and -ve in the diagram also .

[robomaniac]

tight the input to the power and the other input to ground Let's say you power the circuit with 5V, then one input is tie to 5V and the other one is tie to 0V hope that helps Jerome

[sid_bet]

HELLO JEROME , I GOT THE BI CORE WORKING BUT IT TURNS MORE TOWARDS ONE SIDE THAN THE OTHER WILL THE NAIL SOLUTION WORK ? ALSO THE STRESS ON THE IDLER SHAFT IS CAUSING THE PIVOT TO BREAK OFF. THANKS

[sid_bet]

hello jerome , i breadboarded the h-bridge circuit and it didn't work . then i realised that i had made a mistake in the connection of the transistors. i put the all emitters in place of collectors . i have read that connecting transistors wrong way cause them to destroy. will i have to buy new ones ? pls help. Thanks

[sid_bet]

hello jerome, Okay so i connect power only to the inputs. got it Thanks