Battery Buggy B

[Jim_R]

Discussion for Battery Buggy B.

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[wiki]The Best of 2009#Electric_Vehicle[/wiki]
[wiki]The Best of 2009#Scrambler_B[/wiki]
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[SOninja]

Hi everyone. After doing a lot of reading here, I've managed to confuse myself a bit...
I am planning on using the wingnut on a threaded axle to activate a microswitch and stop power.

This is my first time so I wanted to start out simple, using this circuit (but without the connector):



But instead of NO, P, and NC, my microswitch says NO, C, and NC.
I have also looked at this picture on DS's post on microswitches:



and the circuit diagram on this post: http://scioly.org/phpBB3/viewtopic.php?p=23179#p23179 (scroll down a little).

All this confuses me because in the first picture, you have P connecting to the motor, NC to the + side of the battery,
and then in the second picture, you have NC connected to the motor, and P to the battery,
and in the third diagram, you have NC connected to the - side of the battery, and C to the motor.
So what should I connect NC, C, and NO to? And is C the same as P (common and power)?

Thanks!

[Dark Sabre]

I can see how our 3 different diagrams could result in some confusion...

fleet and gh's diagrams are really the same thing. They have an overall power switch, a normally closed circuit powering the motor, and a normally open eddy current brake. When the switch is hit, the motors two terminals are hooked together and you end up with an eddy current brake.

My beautiful diagram assumes that you are using some sort of supplementary braking system...like a motor that lifts the car off the ground or clamps the wheels or something. When the switch is hit, power is taken off of the driving motor and applied to a braking motor.

Yeah, Power and Common could be used interchangeably here.

The diagram you want to use just depends on what braking system you want to try. I'd probably start with the gh/fleet one. If that isn't sufficient for braking, look into a supplementary braking system.

[gh]

Another issue DS didn't clarify on is that current can go through a switch in either direction; if current were water and wires were pipes, a three-terminal switch would be a three-port valve that allows flow in both directions. It doesn't really matter whether the current is flowing from NC to C or C to NC.

Also, Battery Buggy may not allow a braking device to touch the floor, so you may want to look into that.

P.S. Nobody should actually look at DS's diagram; it's only available on the wiki so we can humiliate him.

[RosesAndPandas]

This is my first time on a building event and my partner and I are a bit confused. We finished building the actual vehicle and connected all the wires with the battery pack too. However, when we turn on the switch the engine doesn't run. Any reasons why?

[robotman]

well
A. you wired it wrong
B. you didnt charge your battery pack/dead batteries
C.Bad motor
D.bad switch
E.All of the above

[SOninja]

Maybe it's the wiring.
How does everyone connect their wires?
Can you just twist them and wrap them in electric tape?
What if you didn't have electric tape? Could you use any other type of tape?
or do you have to use a soldering iron?
a crimping tool?
It would be nice to hear some methods that have worked well/ not worked out.
thanks

[robotman]

well till i get it to do exactly what i want i wrap it around and electrical tape it than later i will solder it so that i dont have to worry about it falling off if you really want to get fancy i think that there are connectors that you can by than get crimped to each side and plunged it

[Dark Sabre]

This is my first time on a building event and my partner and I are a bit confused. We finished building the actual vehicle and connected all the wires with the battery pack too. However, when we turn on the switch the engine doesn't run. Any reasons why?

If you can't figure it out after what they suggested, take a picture(s) to show all the wiring and post it.

[RosesAndPandas]

well till i get it to do exactly what i want i wrap it around and electrical tape it than later i will solder it so that i dont have to worry about it falling off if you really want to get fancy i think that there are connectors that you can by than get crimped to each side and plunged it

Do you really have to solder it and crimp it to get the current to go through?