low power mode and temp variation

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Comments (1)

    • 24 August 2006 at 9:35 am
      Case Reference #00002054 --------------------------------------------------------------- Type: Wireless Hardware Sub Type: Sensor Boards Case Reason: Calibration and Repair Date Created: 8/23/2006 Last Updated: 8/23/2006 Subject: --------------------------------------------------------------- callibrating temp sensors Question: --------------------------------------------------------------- I have a 19 node network running in the office using Micaz with mts300 and mts310 boards. At the start of the test I sat all the nodes together to see how the different sensor readings varied across motes. I was suprised to see a temp variation of 1.5 deg C - is this normal? I am running xmesh mts310CB in low power mode with reworked sensor boards. Images of the motes sitting together on my desk and the resulting screen shot in Moteworks for the 12 hour duration. http://blogs.driversofchange.com/emtech/ Response: --------------------------------------------------------------- What you are seeing is normal. The low cost thermistors used on MTS300/310 are accurate only up to +/-3 C. The MoteView uses a generalized equation to convert the voltage output from the sensor into deg C. There is a variation from sensor to sensor and for more accurate values, user needs to individually calibrate the sensors (this could improve the accuracy to within 1 deg C). Sincerely, Giri Baleri Crossbow Technology, Inc www.xbow.com

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