highaltitude.log.20090902

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[09:44] <rjharrison> Speedevil one for you if you awake yet
[09:45] <rjharrison> I want to monitor the electric match to make sure the circuit is fine before firing
[09:46] <rjharrison> I can send a small current through the circuit and it shouldn't trigger the pyro
[09:46] <rjharrison> I then feed this into the uC ADC I guess to monitor the circuit is not broken
[09:47] <rjharrison> I may not need the ADC I guess
[09:51] <rjharrison> When i trigger the device I want to make sure that the trigger charge flowing through the circit is not going to upset the uC as it is connected to gnd side of the firing circuit. The firing chrge is triggered by mosfet
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[09:56] <rjharrison> http://www.robertharrison.org/svn/filedetails.php?repname=the-icarus-project&path=%2FIcarus+III%2Feagle%2FIcarus+III%2FIcarus.pdf
[09:57] <rjharrison> For the circuit just above the notes section with the 2x 100uF Caps
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[11:20] <rjharrison> hey edmoore 2 secs
[11:20] <edmoore> h'ok
[11:20] <rjharrison> I want to test the continuity of the pyro
[11:21] <rjharrison> so I put in a big R on the Vcc side and then on the ground side take off a connection to an ADC pin
[11:21] <rjharrison> Now I'm thinking when I fire the pyro I may need to protect the uC pin
[11:21] <rjharrison> So perhaps another hefty R on the GND side
[11:22] <rjharrison> Does that make sense ish
[11:22] <rjharrison> http://www.robertharrison.org/svn/filedetails.php?repname=the-icarus-project&path=%2FIcarus+III%2Feagle%2FIcarus+III%2FIcarus.pdf
[11:23] <rjharrison> There is a bit of a circuit there above the notes section
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[11:33] <rjharrison> moring natrium
[11:33] <rjharrison> morning even :)
[11:40] <edmoore> rjharrison: sorry - lack of ping made me forget
[11:42] <edmoore> i'm not sure that will work
[11:43] <rjharrison> Me neither
[11:44] <rjharrison> I thought I could get the scope out on it :)
[11:44] <rjharrison> edmoore I assume that this is a relatively easy task
[11:46] <edmoore> well right now you're feeding the pyro thorugh r11
[11:46] <edmoore> which is a 1k resistor
[11:47] <edmoore> which isn't much use to a pyro! needs about 100 times the current that will give it
[11:51] <rjharrison> edmoore Yep that is not the trigger but a trickle current to test continuity
[11:51] <rjharrison> The mosfet will kick in the bulk of the power
[11:52] <edmoore> there's no mosfet that i can see on your schematic...
[11:52] <rjharrison> Yep thats the gap
[11:52] <rjharrison> Need to put that in
[11:53] <rjharrison> My electronics is bad but not that bad that I would use a 1K inte trigger line
[11:54] <rjharrison> inte in the
[11:55] <edmoore> ok. can't really postulate on if it'll work before seeing the actual circuit
[11:55] <rjharrison> Ok np
[11:55] <edmoore> but basically the mosfet needs to be below the pyro on the circuit
[11:56] <rjharrison> Yep
[11:56] <edmoore> and the continuity reading line wants to be between mosfet and pryo
[11:56] <rjharrison> Ok cool
[11:56] <rjharrison> I'll work on that
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[12:11] <rjharrison> edmoore BTW I'm going to have a go at the reflow skillet
[12:11] <rjharrison> http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=59#Skillet
[12:11] <SpeedEvil> awkae now
[12:12] Action: SpeedEvil was moving rock yesterday
[12:12] <edmoore> good luck
[12:13] <rjharrison> Hi SpeedEvil bit stiff this morning! In the done lots of hard work sense!
[12:13] <SpeedEvil> yeah
[12:16] <SpeedEvil> The pyro is connected to what - +7v?
[12:16] <SpeedEvil> the battery +
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[13:12] <SpeedEvil> Oh wow! I tell anglia windows to take me off their phone-spam list - and purely by coincidence a couple of days later they are urgently looking for a limited number of properties in my area to install stuff at a fraction of the normal cost. What are the odds?
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[00:00] --- Thu Sep 3 2009