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cbanta



Joined: 06/12/2015 14:03:03
Messages: 2
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Hello All,
I understand that this is a very simple question, and I think I've figured it out, but want to be sure I'm not missing something. I'm working on a project for a programming class and need to monitor temperature in a sealed environment. This will be battery operated so the low power features of the Anarduino chips are what drew me here. It looks like the CW-915 matches my needs and then some, there's also the example which appears to do exactly what I'm looking for, but I wanted to ask, being that I only need temperature and no other inputs, is there a better chip for my application that I'm missing?
Thank you,
cbanta

This message was edited 1 time. Last update was at 06/12/2015 14:12:05

Rick



Joined: 30/05/2014 22:08:56
Messages: 93
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Hi Cbanta,

Thanks for your message, but I need to ask about requirements.
I've used several different temperature sensors in various projects. Both analog and digital, and there are many types available.
It really depends on what you need.
- what temperature range do you need to support?
- temperature accuracy?
- sample rate?
- data collection and retrieval: wired or wireless, real time? buffered, or just stored data?
- battery life requirements?
- if wireless, what range? what transmission protocol? wifi, fsk, ask, etc..?

I assume since you mentioned monitor, that you'd like real time results.
It's possible to set something up that will run for years off a battery(or certainly through a class duration), but need to consider the factors to properly configure.

Cheers,
-Rick

This message was edited 3 times. Last update was at 11/12/2015 06:56:22

cbanta



Joined: 06/12/2015 14:03:03
Messages: 2
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Hey Rick
- what temperature range do you need to support?

normal outdoor temperatures, from -15 through 110F would be about right.

- temperature accuracy?
Within a couple of degrees would work

- sample rate?
every 5 minutes at the least, but once a minute would be great.

- data collection and retrieval: wired or wireless, real time? buffered, or just stored data?
Wireless upload to an Arduino, that's going to a Raspberry Pi that's remote uploading.

- battery life requirements?
for this part, I'd like at least 6 months, but a year is preferable.

- if wireless, what range? what transmission protocol? wifi, fsk, ask, etc..?
~10 feet, for protocol i'm a bit more flexible.

I would also like to measure frequency (50-400hz) as well, I'm still working that bit out, size is another bigger factor I'm planning on putting this inside a wooden bee hive, so it will be sealed and I'm hoping to make it fairly discrete to the bees.

any thoughts/suggestions you have are greatly appreciated.

Rick



Joined: 30/05/2014 22:08:56
Messages: 93
Offline

Hi Cbanta,

Temp is fine, supported temperature is -40'F to +185'F

Within a couple degrees is very easy to achieve, and lots of available sensor choices.

It's easy to achieve a year operation at 5min temp read/message interval.

Since your distance and protocol requirements are simple, I'd suggest using a low cost radio, such as the RFM69CW.
There is plenty of test example code available as well, which you can leverage for your application.

I'd like to hear more about your frequency measurement.

BR/-Rick

 
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