As you can see from the video Patrick and I finally got water to pass through the pump, aided by a power drill as the two motors we assigned to turn the pump failed. My trip to three hobby stores yesterday in search of sprockets to connect the step motor and drive shaft sprockets yielded zero results, so we couldn’t use the step motor. We foresaw this problem when we decided to use this specific drive shaft so we saved the 12v electric motor from the remote controlled car to use as a back up. But there was always the question of the smaller motor having enough torque to turn the pump. Turns out it didn’t, even with two 9v batteries and a variable resistor, the motor would simply cut out when we gave it surplus power.
For the final design we would like to use the step motor running via a program so we can accurately measure the water going through the pump. I was recommended a great online store from one of the guys from Hobbyrama http://www.smallparts.com/ where we should be able to find the sprockets we need to do the job.
So for the concept presentation we are going to use the power drill to turn the crank which will pump water via spaghetti tube, from a syringe, into a bottle wrapped in acrylic which shows where the bus stops would be.
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