Relay contact ratings.

So you don't have a point.

Of course not. The government won't allow that to happen.

Horseshit. Price isn't everything. Only one component of value is price.

Volume has nothing to do with it.

It already has. Government will see that it continues.

No, the government specifically won't allow it.

Complete bullshit.

--- Why would you hate BASIC and what do you mean by "dialect of English"?

Run through a good compiler, the object code of any programming language should be the same.

---

--- More's the pity.

-- JF

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reg &=3D ~BIT5; reg |=3D BIT7 | BIT 4 | BIT 2; reg >>=3D 4;

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Ah. Got you. And (IIRC) you are correct that a PICKIT 2 won't do PIC24.

My response was in regard to SE's aims for a fridge controller. I don't know what your requirement was.

SE said in a post that she can program in assembler. I make the assumption that she is talking about a micro-controller because that is the context of the thread.

Un-needed for SE if she use's a PICAXE

For a bang-bang controller of a domestic refrigerator (SE's case)? PICAXE is in BASIC. What the user can access is for their exclusive use. The system manges it own stack from separate RAM.

Ah - You can't use PICAXE-08M2. Yo might be able to use PICAXE-20M2. You could use PICAXE-28X2, PICAXE-40X2. They are starting to be expensive, but for a one off, if you don't have a set of tools and a programmer already at hand, still worth a look

You could use PICAXE-28X2, PICAXE-40X2.

The PICAXE also implements plain vanilla 10-bit ADC's. If you want to use a thermistor or just about anything else you can interface to a micro-controller you can. If your an absolute Scrooge and don't care about absolute accuracy you could even use the readinternaltemp command; the hardware for that is free!

Doesn't that make love letters to that special someone difficult to read?

Does it require many #PRAGMA's before you can link up?

-----------------------

One thing that amazes me is that BASIC is often blasted because it is easy to produce unstructured code and has that horrible "GOTO" statement. But C is a great language - you just have to put in lots of effort to produce properly structured code and not use the built in "Goto" command.

Mind you, I do have a bad attitude to C. In uni I mastered Fortran, 8080 (and Z80), 6502, Pascal (I faked my way through Pascal, it just wasn't interesting to me and I couldn't run it at home - thank goodness commenting and analysing the algorithms was important), FORTH and even edlin! - very useful stuff, they didn't even tell us we could type in our name as a command and be amazed and entertained by the resulting chaos. In the last few weeks of the last programming class one of the fellow students asked which language they should specialise in to get a job and they were told "C"!!! (followed by loud expletives from the class)

---------------------------------

This is a useful tool, particularly for one off's with simple requirements. For someone already set up and experienced with another processor maybe not so useful. It did seem that SE didn't have that (since she mentioned buying a programmer)

Cargill

and

No, it is much more of a case of semi open (Wintel) and completely closed (Mac) architectures.

Maybe.

Not at all, Medicare has already seen to that, it has been thoroughly commoditized.

Not by the track record.

?-)

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I am also trying to rebuild my busted fridge, with a more intelligent defrost controller. I don't know if you are following the other discussions. We are trying to measure the compressor efficiency and temperature difference, in order to minimize heating and cooling cycles. To do so, we need to have several thermistors readings and to keep track of past operating cycles. At a minimum, the user would need to be able to set the fridge target temperature, as well as other operating parameters. I don't think the PICAXE is sufficient for this.

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Ah no, I wasn't following it all - you know a PICAXE can also send RS232 to a laptop .. (duck and run)

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So can PIC32, or even WiFi via USB. In fact, we might end up tying all these appliances to a PC. The most efficient defrosting is to pipe hot air or water from natural gas burners. So, we need to control many home appliances altogether. However, installation is more complicated.

Thing is, the compressor isn't going to say to itself "Oh, the incoming gas is closer to ambient temperature, so reducing it by x degrees requires less work.... I can relax for a bit then."

The compressor will run at its design power, and will generate a certain amount of heat within itself, both as a result of the compressed gas being warmer, and as a result of various inherent inefficiences. This will raise its temperature. But if the incoming gas is warm, then that will contribute to an even higher temperature in the compressor. There is presumably a limit to how hot the compressor can run without damage, and hence the question of whether it is safe to run it when the element is warm.

Sylvia.

But when the input to the compressor is at a higher pressure then there is more gas atoms going into the compressor so the compressor has to work harder as it is compressing more gas. Consider the case where the input to the compressor is zero. In that case the compressor is not doing any work.

=20 Dan

t.net ---

Something of an urban myth, I suspect. Certainly there's nothing in my home insurance policy along those lines.

Sylvia.