16F88 and temperature sensor

[DynamoBen]

I've been pouring through the LM335 datasheet. Its starting to look like a really good option. Price looks good...range looks good.

Any gotchas with this one? Disadvantages?

[Acetronics2]

Hi, Ben

The Only disadvantage WAS in Analog meters : needed to have a precise 2.7315 ref voltage to calibrate ( TL 431, generally ...).

nothing to add, except it's analog ... take care with long cables, if so ...

Alain

[DynamoBen]

I'm looking to do time and temp on a motorcycle. Originally I was looking at the I2C temp ICs. This was due to the fact that they are easy to interface to and are fairly accurate. However my concern is protecting the electronics from the environment and getting fairly accurate outside air temp. (within a degree) However if there is a way to use these ICs and keep the rest of the electronics out of harms way I'm all for it.

This is what started my thread. My hope is that if you know my application that will give you insight into what I'm trying to do.

[CocaColaKid]

I run the DS18B20 using the parasite power option and a 22 AWG twisted pair cable with adhesive lines heatshrink over it. The heatshrink seals the sensor making it perfect for harsh environments. Yes they are expensive but I found they work perfect and you don't need to calibrate anything

[picnaut]

Hi,

Analog Devices make a current-based temperature probe called the AD590.
It takes a bit of signal conditioning at the processor side, but you can run the sensor for a hundred feet on a twisted pair. It comes in a small 3-pin package (ideal for heat-shrinking) and is highly resistant to noise.

Here are some links:

http://www.picbasic.org/forum/showth...ighlight=AD590

http://www.picbasic.co.uk/forum/show...ighlight=AD590

http://list.picbasic.com/forum/messages/5820/6521.html?


Good luck!

[DynamoBen]

"22 AWG twisted pair cable with adhesive lines heatshrink over it"

What do you mean by adhesive lines?

[CocaColaKid]

Oops, that should have been lined, not lines.

[Acetronics2]

I'm looking to do time and temp on a motorcycle. Originally I was looking at the I2C temp ICs. This was due to the fact that they are easy to interface to and are fairly accurate. However my concern is protecting the electronics from the environment and getting fairly accurate outside air temp. (within a degree) However if there is a way to use these ICs and keep the rest of the electronics out of harms way I'm all for it.

This is what started my thread. My hope is that if you know my application that will give you insight into what I'm trying to do.

Hi, Ben,

There's no problem on a bike ...I have such a thermometer home for outside temp, a silicone seal and therm schrinkable protects the LM from snow and rain for now 15 years !!!
I think it would be convenient to use shielded cable ( for Alarm wiring i.e. ) not to be disturbed by the ignition system ( ? )

If I understand you well , you're looking for a freeze alert smart device ... isn't it ???

read you soon
Alain

[DynamoBen]

I don't really care about the freez alarm.

Just looking for an outdoor ambient temp when riding. Because everything is going to be in a water tight project box I will need to somehow get the sensor into the air outside the box. (inches at best)

[webstern]

SMT160-30 only need power, ground and signal.

[Dave]

Why not look at the Analog Devices TMP-03. It outputs a ratiometric pulse which can be measured with PULSIN. They make real nice remote sensors and only use 1 pin. I ues them in an weather station I designed and also in my house to control the zone temperature of my hot water heating system.

Dave Purola,