DIY PAR meter, Yeah you heard me - Page 22
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Old 05-23-2012, 12:13 PM   #316
Jeff52478
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I'm going to run out of the 1/4" ethernet cord soon. Home depot stopped selling them by the roll. Do you know of a better solution? It'll be cheaper by the roll.[/QUOTE]


I have a few thousand feet in my garage, it would be kinda costly to send a hole box thru the mail. But I could probably get 1 or 2 hundred feet into a flatrate box if you want.
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Old 05-23-2012, 01:09 PM   #317
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Digikey wire is silly money, try monoprice - http://www.monoprice.com/products/pr...seq=1&format=2 100ft, $10. I use the 4 conductor version for LED fixtures.
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Old 05-23-2012, 02:27 PM   #318
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Hey, those are pretty good prices. Worth the shipping.
The bigger the AWG, the thinner the wire right? It's probably best to have least resistance.
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Old 05-23-2012, 06:00 PM   #319
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Quote:
Originally Posted by mistergreen View Post
Hey, those are pretty good prices. Worth the shipping.
The bigger the AWG, the thinner the wire right? It's probably best to have least resistance.
Yes the "higher" the number the thinner the wire is. 24 awg is thinner than 18 awg. Cat 5 is normally 24 awg. The thinner the wire the more resistance u will have, and stranded wire will also have more resistance than solid.
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Old 05-23-2012, 06:27 PM   #320
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Your volt drop over the wire is the current through the wire multiplied by the wire's resistance. So keep in mine that if those photo diodes don't put out much current than you won't need very large wire. A guess would be that the smallest diameter wire you can find will be much bigger than needed.

I used #18 for my led fixture and I'll be pumping 1.5+ amps through it. I can't see those diodes pushin more than a few hundred milliamperes. Got the data sheet for them?
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Old 05-23-2012, 09:29 PM   #321
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Let me know your current draw (and acceptable voltage drop) along with length and I can spec a wire gauge needed. I know I have a bunch of twisted pair phone wire around, but I might have a lead on some free 'scraps' (less than 50 feet) of Cat5. I'll check in to that tonight and should know by the end of the week. Often places that wire buildings throw away the 'short' leftovers.
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Old 05-24-2012, 01:53 AM   #322
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I'm getting free cat5 cable from jeff52478. You can't ask for a better deal than that.
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Old 05-24-2012, 02:10 AM   #323
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That does sound like a pretty good deal, cool.
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Old 05-24-2012, 01:34 PM   #324
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My new PAR Meter PCB's arrived yesterday along with more parts from DigiKey, so needless to say- I'm ready to build another batch. One of the PCB's that came in is an Arduino shield that I designed to allow me to burn boot loaders and program blank Atmega 328P-au micro-controllers directly from my Duemilanove. The burning process is fully automatic and doesn't ever require a computer. I managed to assemble one and burn 25 chips last night!The shield is set up to accept chips in the DIP28 and DIP32 package and has a FIT1 input for burning the main sketch. I have a few of these shields left over and will share them with anyone interested in having one.
Here's a photo of the Programming shield/TQFP adapter on top of my Duemilanove.


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Old 05-24-2012, 01:45 PM   #325
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That's very cool. Send me a shield with the next shipment.
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Old 05-24-2012, 02:05 PM   #326
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Quote:
Originally Posted by mistergreen View Post
That's very cool. Send me a shield with the next shipment.
Hey Thanks! I'll send you an assembled one with the next batch. All you'll have to add is a ZIF adapter or a TQFP adapter like mine- and you'll be ready to go.
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Old 05-24-2012, 04:13 PM   #327
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I'm not above bribery
Are there any other components that are in short supply I could provide in exchange for a spot on the waiting list? I was going to throw in some cat5 but you've got that covered. I'm not arduino-gifted but I bake a mean oatmeal cookie and my brownies are pretty good.
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Old 05-24-2012, 06:31 PM   #328
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Quote:
Originally Posted by Ryi View Post
I'm not above bribery
Are there any other components that are in short supply I could provide in exchange for a spot on the waiting list? I was going to throw in some cat5 but you've got that covered. I'm not arduino-gifted but I bake a mean oatmeal cookie and my brownies are pretty good.
Bribe away but there's no waiting list We all enjoy cookies & brownies.
First one to buy off the swap & shop. That's all.
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Old 05-24-2012, 08:16 PM   #329
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I used these when I was still a test tech at an assembly house programing embedded firmware in various products for customers.
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Old 05-25-2012, 12:26 AM   #330
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Hey, what do you guys think of this new sensor design; less parts, cheaper, faster to make.
I don't think it's as durable as the one with the cup housing but 'good enough'?
The shrink tube is holding the diffuser in place.
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