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Picture of NXT Dynamo Car! NO BATTERIES!
I will show you how to make an Lego Mindstorms Car without using any batteries to make it move!

See? I wasnt joking:)
 
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Step 1: You will need:

Picture of You will need:
NXT Mindstorms 2.0 Kit:
2 Electric Mindstorms NXT Motor
2 Technic Axle 9
1 Technic Axle 5
4 Technic Bush 1/2 Smooth
1 Technic Bush
4 Wheel 43.2 x 22 without Pinholes, with External Ribs
4 Tyre 43.2 x 22 ZR
2 Technic Gear 36 Tooth Double Bevel
1 Electric Cable NXT 50cm
If you are not sure what parts you have, visit this website
http://static.robotclub.ab.ca/pages/nxt/InventoryComparison/nxt_1_vs_2_vs_edu.html

Step 2: Step 1

Picture of Step 1
Put the 4 Tyre 43.2 x 22 ZR onto the Wheel 43.2 x 22 without Pinholes, with External Ribs.

Step 3: Step 2

Picture of Step 2
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Put the 2 Technic Gear 36 Tooth Double Bevel onto the Technic Axle 5, then insert that into the Electric Mindstorms NXT Motor.
Lock it with the 

Step 4: Step 3

Picture of Step 3
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Insert the Technic Axle 9 into the motor, pop the wheels on, and then lock it with 2 Technic Bush 1/2 Smooth

Step 5: Step 4

Picture of Step 4
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Insert the other Technic Axle 9 into the two beams of the motor, locking it with the Technic Bush in the middle.
Again pop the wheels in, and lock it with 2 Technic Bush 1/2 Smooth
The car should take shape

Step 6: Step 5

Picture of Step 5
Connect the Electric Cable NXT 50cm into both motors.

Step 7: Finished!

Picture of Finished!
Now turn the 2 Technic Gear 36 Tooth Double Bevels, the car should also move. Turn clockwise to move forward, anticlockwise to reverse! Simple and fun:)
There's a cable sticking out of the motor, it's hooked to the nxt which is off camera.

Actually, your wrong. It is NOT hooked onto the NXT, and the NXT is not off-camera either. In fact, I even tried this, and it turns out energy can be transferred between 2 motors. But he didn't really mention that the car can't steer.

Oh wait i see what you did nevermibf
Good idea! I've done this many times with model motors. Why didn't I ever think to do it with Mindstorms? :)
samando2 years ago
Nice Instructable, I found that this technique makes for very good proportional steering on wire-control models.
NXTHacker (author)  samando2 years ago
yep:)