<div dir="ltr">Paul,<div><br></div><div>Check out this 8 channel chip with the diodes built in. 50 V, 500 mA.</div><div><br></div><div><a href="http://www.adafruit.com/products/970">http://www.adafruit.com/products/970</a><br></div><div><br></div><div>Shane</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jul 25, 2015 at 8:13 PM, The MacDougals via TriEmbed <span dir="ltr"><<a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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<p dir="LTR"><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">I want to drive 16 solenoids</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri"> (</font></span><span lang="en-us"></span><a href="http://www.sciplus.com/p/12-VDC-SOLENOID-VALVE_49518" target="_blank"><span lang="en-us"></span><span lang="en-us"><u><font color="#0000FF" face="Calibri">http://www.sciplus.com/p/12-VDC-SOLENOID-VALVE_49518</font></u></span><span lang="en-us"></span></a><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">)</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">. They are 12V, 100mA devices. At most 8 will be on at any time. Assume 100% on time for any one device.</font></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">I have been using this N mosfet</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri"> for driving motors for my cat feeder and drip irrigation:</font></span><span lang="en-us"></span><span lang="en-us"></span><span lang="en"> <font color="#333333" face="Helvetica">FQP30N06L</font></span><span lang="en-us"></span><span lang="en-us"></span><span lang="en"></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">It works for driving the solenoids.</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri"> However, being a cheapskate, I am wondering if there is something less expensive</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri"> (</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">FQP30N06L</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri"> is $0.95 at Sparkfun, more at Digikey)</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">?</font></span><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">I will likely be using ATTiny8</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri">4</font></span><span lang="en-us"></span><span lang="en-us"><font color="#1F497D" face="Calibri"> to</font></span><span lang="en-us"></span><span lang="en-us"> <font color="#1F497D" face="Calibri">an I/O expander like:</font></span><span lang="en-us"> </span><a href="http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf" target="_blank"><span lang="en-us"></span><span lang="en-us"><u><font color="#0000FF" face="Calibri">http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf</font></u></span><span lang="en-us"></span></a><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">I know I will need diodes across the solenoids to suppress the back EMF when they turn off.</font></span><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">I was not planning on any opto-isolation.</font></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">I will probably be using a lead acid battery to power the solenoids.</font></span><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">Thanks.</font></span></p>
<p dir="LTR"><span lang="en-us"><font color="#1F497D" face="Calibri">---> Paul</font></span></p>
<p dir="LTR"><span lang="en-us"></span><span lang="en-us"></span></p>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><span style="color:rgb(0,0,0);font-family:HelveticaNeue-Light,'Helvetica Neue Light','Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;font-size:16px">A blog about some of my projects. <a href="http://fettricks.blogspot.com/" target="_blank">http://fettricks.blogspot.com/</a></span><br></div></div>
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