I'm not sure if the Surge is supposed to report acceleration in g or mg, but the accelerometers on MTS310s are not individually calibrated. In order to get more accurate acceleration reading, you will need to estimate the bias and sensitivity by orienting each accelerometer axis towards the gravity axis (+1g and -1g) and then use those calibration constants in the xlisten parser/converter. Regards, Giri
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of sougata sen Sent: Thursday, April 05, 2007 12:03 AM To: tinyos help Subject: [Tinyos-help] Usual readings for Accelerometer Hi We aee using crossbow micaz motes (with sensor board MTS 310). We are using unmodified Surge and xlisten to view the sensor readings. A sample output is: SURGE [sensor data converted to engineering units]: health: node id=5 parent=65535 seq_no=525 battery = 2878 mv temperature = 25.35 degC light: = 663 ADC mv AccelX: = 1160.000000 g, AccelY: = 1000.000000 g MagX: = 12.69 mgauss, MagY: = 15.26 mgauss The accelaration given by sensor is 1160g. Is it 1160 times gravity? -- Sougata Sen Bangalore
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