Technic Lego Programmable Vehicle Prototype #1
For this prototype I just wanted to make sure I could get the card going backwards and forwards indefinitely in a loop, and still remove/place the card easily. The card hits the motor switch which puts the motor into reverse.
The two switches are connected so hitting the one resets the other. One of the switches is under tension with a hair elastic, so the motor just has to push it past its tipping point (this is a real issue because to reverse the switch you have to go via the 'off' position - my fear was the card would nudge the switch to the 'off' position and no further, thus stalling it. The hair elastic pushes the switch further, meaning there is no off position possible.
Next phase is to make it look nicer (not my strong point) add steering, forward/backwards movement, and some kind of crane device on the top. These will all be driven via the card, by other ratchet thingies (as you can see in this video along one edge of the card. The hope is I'll be able to change the movement sequences really easy by taking out the card and rearranging the ratchet thingies.
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