Event sensor board- Vibration and LDR sensors

sofia · **Joined:** Tue Jun 22, 2010 12:50 pm **Posts:** 45

Hello,

We are using the event sensor board with a PZ-08 vibration sensor and a LDR sensor.
In the case of the PZ-08 sensor, we obtain values around 0,2 and 1,5. Which are the typical values?
For the LDR sensor, we have tried with different sockets. With socket 6 we obtain values between 1 and 2.4. The 1 value when the sensor is covered. With sockets 1 and 3 we obtain values between 3,2 and 2,5. The 2,5 value when the sensor is covered. Why do we get these different values depending on the socket? Which are the typical values?

Thank you very much.

Sofia

libelium-dev · **Joined:** Mon Sep 28, 2009 1:06 pm **Posts:** 7467

Hi sofia,

the output of the piezoelectric sensors changes very quickly once you apply or remove a deformation to the sensor, so you may find a high variation in the read values when you receive an interruption. This values may vary along all the range of the Waspmote analog to digital converter, from 0V to 3.3V.

Regarding the LDR, I'd advise you to place it in sockets 3 or 6, since sockets 1 or 2 have higher load resistors (are you sure you didn't mix the measurements you point?). The read values may vary also in all the range of the analog to digital converter, but it will be difficult you can get values below 0.5V or above 3V, since the sensor should be placed in extreme conditions of darkness or light.

Regards.