School Project Help

[saintelvis01]

Hi Everyone,

I am trying to create a battery powered car as in the following link using the same parts described but have one dilema..... I need to be able to reverse the polarity on the car. I have been able to create a system that works using two paper clips and moving between the posts as in the diagram...But I am looking for a better way to do it...Any thoughts?



**broken link removed**

 

[audioguru]

Simply flip one end of the rubber band over to reverse the direction. Have a piece of plastic sheet in between so the rubber band doesn't wear itself out.

 

[steveB]

Hi Everyone,

I am trying to create a battery powered car as in the following link using the same parts described but have one dilema..... I need to be able to reverse the polarity on the car. I have been able to create a system that works using two paper clips and moving between the posts as in the diagram...But I am looking for a better way to do it...Any thoughts?

Actually, you are doing it correctly. The only modification would be to attach the two paperclips together (mechanically, not electrically! ) so that they move as one switch. You will then have the standard double pole, double throw (DPDT) switch.

Or, you can buy a small DPDT switch, mount it and solder in the circuit. But, I like the improvised method better for this type of project.

 

[saintelvis01]

SteveB,

Thanks for confirming this for me.... I did have a couple of tooth picks holding the two paper clips together but need a better solution... The contacts are not staying connected as well as hoped...I am still working on it.

Cheers