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Step 5Water Pump
The water pump was pulled out of a battery operated squirt gun. The pump is attached inside the bottom and vinyl tubing was run from the water reservoir to the pump and up through the frame to the mouth area.
I used copper tubing velcroed to the frame to try and control the placement of the exit end of the tubing. There is probably a better way to do it. The water reservoir is just a sports water bottle. I cut a hole in the top and attached the top of a soda bottle with cap to provide a water refill hole. This passes through the top of the box so I don't have to turn it over to refill. I used the nozzle end of the squirt gun where the water comes out and attached it to the end of the copper tubing in the mouth area with a short piece of vinyl tubing so it's flexible. This will shoot water just like the squirt gun did. You can use any cap\plug type thing with a pinhole in it to the same effect.
The pump is activated with a 3rd servo mounted to a piece of wood. I cut the servo disc into a cam shape to activate the micro switch which feeds 6 volts to the pump motor and at the same time lights up the red led eyes. This setup allows me to operate the mouth independent of the water pump so I can open and close the mouth without squirting people. If you want you can eliminate the 3rd servo and activate the pump using the servo for the mouth. Just add some linkage to activate a switch at the same time the mouth is all the way open.
I used copper tubing velcroed to the frame to try and control the placement of the exit end of the tubing. There is probably a better way to do it. The water reservoir is just a sports water bottle. I cut a hole in the top and attached the top of a soda bottle with cap to provide a water refill hole. This passes through the top of the box so I don't have to turn it over to refill. I used the nozzle end of the squirt gun where the water comes out and attached it to the end of the copper tubing in the mouth area with a short piece of vinyl tubing so it's flexible. This will shoot water just like the squirt gun did. You can use any cap\plug type thing with a pinhole in it to the same effect.
The pump is activated with a 3rd servo mounted to a piece of wood. I cut the servo disc into a cam shape to activate the micro switch which feeds 6 volts to the pump motor and at the same time lights up the red led eyes. This setup allows me to operate the mouth independent of the water pump so I can open and close the mouth without squirting people. If you want you can eliminate the 3rd servo and activate the pump using the servo for the mouth. Just add some linkage to activate a switch at the same time the mouth is all the way open.
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