Archive for the The after market Category

Phew!

Posted in The after market on January 20, 2017 by asteriondaedalus

Outbid on server.

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I am in so much trouble …

Posted in Linux, Nostalgia, Parallel Talk, The after market on January 18, 2017 by asteriondaedalus

… wife will kill me!

Look what I bid on!

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So, 4 cpu server with 70plus gig of memory.  Maybe dual cores (so eight all up), may be quad cores (so 16 all up).  Won’t know until I grab it (if I win the auction).

I will have to install a hard drive.

Turns out Debian installs just fine, based upon web searches at least.

Why?

Chapel box.

And cheaper than a Parallella.

Should be able to stuff at least one CUDA board in it – just need find a good second hand one.

Go figure, powers up but that’s all I know.

I am so dead.

Mind you, both the wife and the mother in law are actually addicted now to the auction website.

So I feel vindicated … but very, very afraid.

So why do I want to buy the second one they have?

Spares?

Death wish?

Is Charles Bronson channeling through me?

5dw

Zippity do dah, zippity ZAPPP!

Posted in Hardware, Sensing, The after market on December 25, 2016 by asteriondaedalus

Looking at OpenSprinkler circuit, the use of SCR to control the solenoids appears to require the addition of TVS diodes a plenty.

That would be a design decision.

As OpenSprinklette is using relays to drive the 24VAC solenoids we need not apply protection there.

Nuisance factor though is that trying to source non-SMD bidirectional channeled TVS, for the rain gauge input, not so much fun.

For the prototype at least, without any SMD pads on the prototype shield, we are happier with DO-15 or similar package types for the protoboard’s pad spacings.

Luckily though AliExpress came to the rescue.   I have ordered a packet 100 x 36V 1500W bidirectional TVS for US$11.   Now the original design calls for 48V but the markings on the devices suggested unidirectional and the text supporting them did not mention bidirectional.  So, just in case I have ordered 10 x 39V 1500W for US2.80.  That’s the problem with AliExpress and working with penny market vendors therein.  You take what you can get.

So rain gauge and TVS on the way.  I finally decided the shield I am designing will have an input for a rain gauge for those you want a minimal four sector.  The idea of a rain gauge with an ESP8266 has not gone away though.  Where we are using the mqtt and node-red we can build up as we please – over time.