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<title>Wheaton Fab Lab: Resources</title>
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we needed to get the water from jugs in a freezer to a faucet
We had brainstormed a lot of different ways of doing this but
once we started getting the parts a lot of the ideas started
to not really work. We ended up realizing that we needed to
use gravity to get the liquids to the pumps because they didn't
work under vacuum, and wouldn’t pump air. We then thought of a
cool way to clear the pipes after dispensing the drink. We then
got the fridge and decided that it wasn’t safe to drill a hole in
the side of the fridge, due to us not being able to locate the pipes
in the walls. So we had to fit all the plumping into the fridge.
<br><br>
The first thing that we needed to get done was to take inventory of supplies
we were going to need in order to get the task of plumbing done. Through
discussions with the other groups, our assignment through these two weeks was
to create a plumbing system that would offer four different kinds of beverages to the user.
<br><br>
Supplies:
<ul>
<li>Pump (DC 12V, Flow: 7.5LPM)</li>
<li>Pipes (OD = ¼in ID = 3/8in)</li>
<li>Valves</li>
<li>4 Tanks</li>
<li>4 Bulkhead unions</li>
<li>3 1/4in splitters</li>
<li>4 Adapter 1/4 in ID x 3/8 in MIP</li>
<li>3 Tee 3/8 in ID</li>
<li>5 Solenoids</li>
<li>4 N-Channel Mosfets</li>
<li>Orange and Brown Wires</li>
</ul>
<br><br>
The first thing we needed to do was to test the pumps that came in with our Mosfets.
Below you can see the setup we used worked out onto a breadboard.
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<br><br>
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<img class="image" src="images/mosfet_breadboard.jpg">
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We needed this setup in order to convert 5V to 12V. The board consists of 4 transistors
each accompanied by a 5k ohm resistor. Below you can see a video of us finally getting the pump to work.
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<br><br>
<video>
<source src="images/mosfet_testing.mp4" type="video/mp4">
</video>
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The Mosfets have terminals labeled gate, drain, and source. A Mosfet is similar to variable resistors but
where the gate-source voltage difference controls the drain-source resistance. We used a resistor to drain
the gate so that you can easily turn the Mosfet on and off.
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<br><br>
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<img class="image" src="images/mosfets_pinouts.jpg">
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The images below are of the solenoid valves that we used. We then got them functioning using the mosfets.
The solenoid valves work by converting the current that is supplied into an electromagnetic field which
applies mechanical energy to move the valve to a desired position. This allows us to regulate the flow of our beverages.
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<br><br>
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<img class="image" src="images/solenoid.jpg">
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We originally had some larger jugs that we were going to store our beverages but we had to make some changes due to some
sizing issues. Below you can see the jugs that we used, we installed some bulkhead unions using teflon tape to secure a
good connection so as to not cause leaks.
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<br><br>
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<img class="image" src="images/bulkhead.jpg">
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We made a stand for the jugs in the fridge so that we could fit our plumbing underneath it. It also had the extra benefit of
making the pumps closer to the jugs. We used the 3 axis mill to make the bed of the support
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<br><br>
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<img class="image" src="images/Jugs.jpg">
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We made a stand for the jugs in the fridge so that we could fit our plumbing underneath it. It also had the extra benefit of
making the pumps closer to the jugs. We used the 3 axis mill to make the bed of the support. Below you can see the CAD model we made
in Fusion 360. We set this up in the manufacturing tab in order to mill it out the the 3 axis CNC.
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<br><br>
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<iframe src="https://a360.co/3mp1aVu" width="800" height="600"></iframe>
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Below you can see the process of the board being milled out on our machine. We ran into some problems as fusion
really didn't like milling out the letters we had set to be cut out. But over all this stand was not going to be seen
by the people using the machine so we just needed the holes to works as intended.
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<br><br>
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<img class="image" src="images/axiom1.jpg">
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Below you can see the end procces after the Axiom finished its operation.
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<br><br>
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<img class="image" src="images/FridgeSupport.jpg">
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Using the stand we created with the 3 axis mill, our jugs fit perfectly into the fridge with room below for the solenoids
and pumps (the pumps and solenoids can withstand the temperature we are subjecting them to). This is a picture of the fridge
with the jugs on the supports
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<br><br>
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<img class="image" src="images/JugsInFridge.jpg">
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We attached the solenoids to the bottom of our stand as they had slots for screws of the top for exactly this reason. The jugs then
slot into their stand then with tubing connected with the solenoid with fittings and fasteners in order to not have any leaks.
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<br><br>
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<img class="image" src="images/solenoid2.jpg">
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After predrilling hole we secured the solenoids by screwing them on through the front of the board.
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<br><br>
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<img class="image" src="images/solenoid3.jpg">
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We slowly worked away at connecting pipes and valves until we got everything attached below is the end result, we have connected our four
solenoids connected to our flour jugs. We attached the valves to the bottom of the support board and then connected the valves with T joints which are then sent to a pipe that will eventually reach the faucet.
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<br><br>
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<img class="image" src="images/solenoid5.jpg">
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We had mutliple wires that needed to be spliced together as the pump had wires that needed to go to ground and powers, as well
as the solenoids. This single picture doesn't show the extent of the amount of wires we connected.
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<br><br>
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<img class="image" src="images/solenoid7.jpg">
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Next we needed to make a board that will be used with our mosfets that will be integrated with the electronics group. you can see our
initial schematic and pathing we made below, but we ended up getting confused with the drain, source, and gate of the transistors
and ended up routing the board incorectly. In this case we mixed up our gate and drain.
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<br><br>
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<img class="image" src="images/AnotherBoardPhoto.jpg">
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<br><br>
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<img class="image" src="images/BasicSchematicMissingPS.jpg">
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We milled out the board that ended up not working with the roland
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<br><br>
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<img class="image" src="images/roland1.jpg">
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Below is a video of how we have to zero our z axis. In a perfect world, since our board is no 100% flat,
we could use a tool that would map a gradient of our copper so that our paths would cut out properly.
Instead we had massive problem cutting our traces as our surface was in no way even. We cut our traces multiple times
all the while adjucting the zero of the z axis. When we first set it up, we tried zeroing our z in the middle of our cut,
but we had to set it more to the right in succesive cuts (we had to do traces multiple times).
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<br><br>
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<img class="image" src="images/zeroz.mp4">
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Below is the full cutout of the board that didn't end up working.
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<br><br>
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<img class="image" src="images/transistor_board.jpg">
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Below is the new schematics and pathing done where we have drain, gate, and source correctly pathed
this time around. Another added thing is the lines that were connecting to our power source were made thicker. We needed to
make the lines bigger not because of the voltage but because of power.
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<br><br>
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<img class="image" src="images/newschematic.jpg">
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<br><br>
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<img class="image" src="images/newpaths.jpg">
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Below is our board fully milled out, as you can see we were in a rush and part of the board we were using had a
failed cut on it so we used a hacksaw to get our board instead of waiting over thirty minutes for our outline cut
to be done.
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<br><br>
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<img class="image" src="images/tranhacksaw.jpg">
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We collaborated with the electronics group in order to get out trasistor set up with the electronics they need in order
for it to control 12V with a 5V logic system.
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<br><br>
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<img class="image" src="images/tranconnected.jpg">
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We got everything set up in the feezer and everything was working as planned.
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<br><br>
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<img class="image" src="images/pump_working.mp4">
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<br><br>
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<img class="image" src="images/plumbing_installed.jpg">
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