kasser

hello:
i want to design a circuit using microcontroller for watching a disel engine parameters as (temperature,presure and its generator) .
what is the better choise:PIC or AVR for working near an engine

mcs51mc

(portable) PC and DAQ aquisition card from NI

Nigel Goodwin

I would have thought either would be suitable?.

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Gayan Soyza

They both will get damage due to excess heat unless you have a proper enclosure.

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HarveyH42

Go to the Atmel website. Theu have a whole series of AVR chips, specifically for automorive applications. I never read anything on them, as have no need at this time.
I just started last December, done a few abusive things in the learning process, and yet to destroy my first MCU. AVR chips are pretty tough.

Like it's stated above, you need to protect any circuit placed in the engine compartment from heat, elements, and vibration. All the components, not just the MCU have an operating temperature range.

mneary

Neither.

For good reason, you'll find that manufacturers put as much of the electronics as they can, inside the passenger compartment.

Vibration, temperature, electrical noise, and moisture are much more moderate.

3v0

The OP did not say he wanted to put the processor on the engine. Just near it. A computer on the passenger side of a firewall is near the engine.

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mneary

True.

Sceadwian

The fundamental technology used to great both PIC's and AVR's are the same, neither one is going to have an inherant advantage.

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mramos1

There should be sending units that are terminated under the dash (assuming this engine is in a vehicle) for all the things you are after.

Can you provide more details?

You can pick them up there and use either micro-controller to do the job.

Search the forums, there is a fellow doing a speedometer with a PIC chip.

kchriste

For heat, get a MCU with an extended temperature range. The PIC16F628 extended temperature range device works up to 125C whereas the industrial temp range ones only are spec'd to 85C. The support components also have to be spec'd to the max temp you'll expect as it is always the weakest link that fails.

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mcs51mc

If you don't have the $ or £ or € for NI material, check this one: http://www.picotech.com/auto/index.html

Please consider scan rate, accuracy, resolution and so on before starting any ADC stuff.

Danny_fishhead

I think the key is not the selection of MCU, BUT your design method. either of them work if you have a good deign.

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