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electrical.html
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<!DOCTYPE HTML>
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<title>Electrical</title>
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<h1 id="logo"><a href="index.html">PoE Fall 2016 <span>Section 2</span></a></h1>
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About
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<h2>Behold the <strong>Electricity</strong></h2>
<p>An overview of the electrical system</p>
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<h3>Our Circuit</h3>
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<p>For our project, we decided to use an Arduino to activate solenoid valves, which control the water flow. We decided to use PSMN022-30PL mosfets to control the solenoid valves since they can handle the power draw from the mosfets and were in stock in the electrical stockroom. Since the arduino only has 14 IO pins, we needed a solution to expand the number of outputs we had. We are using SN74HC595N shift registers to expand the number of outputs that are available from the arduino. These shift registers can only output a few milliamps on the output pins so we needed to have a buffer between them and the mosfets that are controlling the solenoid valves. We are using ULN2803 Darlington transistor arrays as a buffer between the mosfets and the shift registers.</p>
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<h3>Solenoid valves and power supply</h3>
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<p>We are using 12v 1/2" solenoid valves to control the flow of the water through each of our nozzles. These solenoids have about a 1.5 amp inrush current so for 32 valves turning on at the same time, there would be about a 48 amp pull from our power supply. To power our valves, we are using a Dell Z750P-00 750 watt server power supply which is able to deal with this large current draw.</p>
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<h3>Flyback Diode</h3>
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<p>The solenoid valves are inductors so they store energy in their magnetic field. When an inductor turns off, there is still energy stored in that magnetic field which needs to be disipated. To do this, we are using a flyback diode which allows current to flow in a loop when the solenoid is turned off.</p>
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