Recent content by Dave Casazza


 
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    4.1 in SMD - It can be done!

    I would have agreed with you Ralph about 2 years ago, but Matt M. showed me the error of my ways :). Take a look at the SMD tech available - http://en.wikipedia.org/wiki/Surface-mount_technology 2512 is as big as a normal PTH. Once you place your components, 5 minutes in a cheap toaster oven...
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    4.1 in SMD - It can be done!

    Not yet. circuit building tends to be a winter activity. Too much fun to have in the summer! Also, it depends on the features. I tend to drop the features that really aren't well used. Frankly, I screw up more PTH than SMD boards when soldering. Not sure why we haven't moved to SMD yet...
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    HeaterMeter 4.2 giveaway

    I'm in! Thanks
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    All about thermocouples!

    I haven't been on in a few months, but I was researching how to calculate cumulative temps for pasteurization in my sous vide system, and I found the mother load of info regarding thermocouple design. I'd start with this excellent video...
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    The Development Log

    Ok, so if the ADC permits the input of 0-1023 to measure 0-5V, what do the Y axis values mean in this graph? I assume I'm seeing the voltage measured in ADC values? And the Mavericks are positive temperature coefficient thermoresistors? Nevermind - I figured it out. On a related note, I was...
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    The Development Log

    Ok, here is the debug output.... how do I interpret it? It does look a heck of a lot smoother than your graph, just from my uninformed review. [ED: Added new graph later] Later, I've recorded a busier graph:
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    The Development Log

    I'm seeing a graph that is very smooth, measuring ambient air temp. The house heater was turned off. What do you have radiating at your place? 200 Watts of Transmitter? (ed: sorry for the snark) Does it make sense for you to test an alternate design at your place?
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    The Development Log

    Can you point me to the post where you show how do load/run your debug mode? I'd like to do the test with my SMD design and see if i can replicate it. I'm guessing that designing the AVR chip so that the temp analog traces are as close as possible to the thermoresister plugs would be helpful.
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    The Development Log

    Hey Brian, If I can recommend this - definitely go digital and avoid the issues (as you are currently experiencing) with analog. You do away with many hardware complexities. If you do a search on the net, you can see that most thermocouple implementations don't select the analog route...
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    4.1 in SMD - It can be done!

    I'm debating adding a capacitance set of switches to drive the HM inputs. Would mount the capacitance sensors on the inside of the case. This looks interesting: http://www.atmel.com/Images/Atmel-9524-AT42-QTouch-BSW-AT42QT1040_Datasheet.pdf
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    4.1 in SMD - It can be done!

    I don't see how you can't try your hand at footprint minimization. ITead will permit you to spend $20 to fab your board for 10 copies, although you have to wait for the boat to come in from HK.
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    4.1 in SMD - It can be done!

    I'd soooo much rather do SMD than PTH. PTH is a PITA. The 3.3 was the MCP1700T-3302E. Thanks for the critique! Kester EZ Profile 256: http://www.amazon.com/exec/obidos/ASIN/B006UTCYM2/tvwb-20
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    4.1 in SMD - It can be done!

    Sure: http://i.imgur.com/uexsiGq.jpg?2 and http://i.imgur.com/eMvn8yw.jpg?2
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    4.1 in SMD - It can be done!

    Enjoy! Tools: Toaster Oven Solder Iron Wick EZ Profile Uses: ATMEGA328P-AU One flub: I need to get an SMD crystal! Breaks out probes to RJ45: *** 22.5" One Touch Silver // UDS with HM4 // Mak 2 Star
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    Thermocouple Board Success (sort of)

    Hi Frank, I would love to see your designs as well, if you want to PM me with your files. Thanks (in advance), Dave

 

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