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1  Using Arduino / Project Guidance / Re: Outdoor enclosure recommendations on: September 14, 2013, 10:34:20 pm
Thanks to everyone for their responses

In the past couple of weeks, I have continued to read more few articles/forums about this topic. 


Here is where I am:

- for the small hobbyist like myself, vacuum sealing is not practical. 
- I may try desiccant but am worried it will require fairly frequent changes.  As long as it is at the same frequency as the battery change, this is probably ok (my sensors can currently run for about 1 month on a set of batteries)
- Another option someone suggested was to completely coat all electronics with a spray sealer.  Lot of people do this to RC truck electronics for waterproofing and it works well.  This may be a last resort.  Once you spray the stuff on, you won't be able to re-use the electronics for any other projects.
- I may try to hack up my own vent to start with.  The tyvek suggestion is interesting.  A friend suggested finding an old gortex jacket at a thrift store and slicing it up.
- I did look at NEMA enclosures but they are way too big... my sensors are in fairly small plastic boxes

2  Using Arduino / Project Guidance / Outdoor enclosure recommendations on: September 02, 2013, 07:00:08 pm
All,

I have built some wireless sensors for outdoors and have them in waterproof enclosures.  However, small amounts of moisture are getting in causing condensation as the temperature changes.  After some research, it seems this is a common problem with outdoor waterproof enclosures and that's why companies make breathable membranes for them like:

http://www.sealingdevices.com/gore-vents

I have been trying to get a small set of (goretex or similar) breathable membranes but it seems like you can only get them as a manufacturer, not a hobbyist.

So does anyone have any recommendations for how to proceed? 

thanks
bc-ne


3  Using Arduino / Project Guidance / Re: Advice for wireless connectivity on: March 20, 2013, 09:37:18 pm

By "Arduino + Wireless shield + Xbee module" I mean using an Xbee module with the Wireless SD shield (which just has a space for a xbee or bluetooth module)

http://arduino.cc/en/Main/ArduinoWirelessShield


Wifi isn't an absolute requirement... just getting the sensor data reliably is the critical aspect (on battery power)

4  Using Arduino / Project Guidance / Advice for wireless connectivity on: March 20, 2013, 09:19:22 pm

I am working on a project that can be described as:
- An arduino uno that will take input from several sensors
- I need it to transmit the data back to a computer approx 75 feet away (i.e. the arduino will be a client only)
- The arduino will be battery powered so I plan to put it in deep sleep for long periods (10 mins)
- I will only transmit the sensor data back (a very small amt) approx every 10 minutes
- I do not want to change the batteries or reset the arduino very often (i.e it needs to run on its own for at least weeks at a time)
- The arduino will be in an area covered by wifi

The reason for this post is to get advice for wireless options.  I have been extensively reading about the options and here's my impressions of the options:
- Arduino + Wifi shield: The wifi shield firmware is not stable when running over long periods.  There are also issues with getting it to reliably go into sleep mode.
- Arduino + Ethernet shield + external Wifi bridge: There are several cheap wifi bridges that I have found people using but this combo seems like a bad idea for battery based projects.
- Arduino + Wireless shield + Xbee module: seems like an ok option but I will need to get some good examples because the v2 stuff is tricky to setup.  I couldn't find too many arduino projects using xbee.  This is where I am leaning right now.
- Arduino + Wireless shield + Bluetooth module: didn't see too many people using bluetooth -- it isn't the best for low power either
- Arduino + Raspberry pi + wifi usb dongle for pi: interesting option but I think this will break my power budget
- Arduino + Electric imp : another interesting option but I think this will also break my power budget
- Arduino + some sort of RF board: I don't have time to mess with this

In my ideal world, I would like an extremely reliable wifi interface that could reliably be put into and out of sleep mode for long periods to preserve battery life.

So arduino experts, what are your thoughts?
(reliability and low power are key)

thanks



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