Science Buddies: "Ask an Expert"

[Posted on behalf of students working on this project: How Fast is Automatic Braking? https://www.sciencebuddies.org/science- ... ic-braking]


We have download the Adruino program and have uploaded the automatic braking code and the ping code from examples. When we unplug from the Chrome the car spin in circles. It stops if you put your hand in front of it.

Also,
Does it matter if the bread board has a 3 battery pack vs a 4?

Hi:

1) If your car is spinning in circles instead of driving forward, that just means one of the motors is spinning backwards. You can fix this by simply reversing the red and black wires for that motor. Then your car should drive forward.
2) It's OK to use a 3xAA battery pack instead of 4xAA. That will make the car drive a little slower.

Thanks,

Ben

Thank you!