Humidity Logger
Moderators: adafruit_support_bill, adafruit

Humidity Logger

by exp0sure on Wed Nov 14, 2012 6:20 am

Hi,
I want too hook up 2x humidity sensors to an Arduino and log the data to an SD card. 1 sensor should be in the attic so I would want a wireless connection here. Would it work with the following components?

Arduino
2x Sensiron Temperature/Humidity Sensor - SHT11 (ID: 246)
2x XBee Module - Series 1 (ID: 128)
1x Adafruit Data logging shield (ID: 243)

I haven't used an XBEE yet but do I understand it correctly that I can just hook up a XBEE to the Arduino and one to the Humidity sensor and then simply read/send values to the humidity sensor (those 2 XBEEs create a wireless serial connection)?

To hook up the second serial humidity sensor I'd probably need a second serial port? (either soft port via library or multiplexer to switch between sensors?)

Also can I assume that I can access the RTC in the logging shield to use it as a timer?

Cheers!
exp0sure
 
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Re: Humidity Logger

by adafruit_support_bill on Wed Nov 14, 2012 6:39 am

Yes, this can be done, but I think you need the Series 2 XBee. Here is a nice writeup on how to interface the sensor to the XBee: http://jdesbonnet.blogspot.com/2012/01/ ... ature.html

Since Arduinos are 5v devices and the XBees are 3.3v devices you need something like the XBee adapter to shift the logic levels. https://www.adafruit.com/products/126
You can interface more other remote sensors via the same XBee. A local sensor would require just 2 pins. You can use the RTC on the logger shield for timing.

For a great reference on remote sensing with XBees, I highly recommend Rob Faludi's book:
https://www.adafruit.com/products/963
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Re: Humidity Logger

by exp0sure on Wed Nov 14, 2012 3:39 pm

Thanks! I'll have a read...
exp0sure
 
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