Reports.SQ-SEN-003PSTiltSensorSummary History

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SQ-SEN-003 PS Tilt Sensor\\
Manufactured by
[[http://www.signalquest.com|SignalQuest]]

http://itp.nyu.edu/~gak217/fall05/sensor/assignment2/tilt1.jpg


[[http://www.signalquest.com/SQ-SEN-003P%20-3PS%20-3PS-XL%20Omnidirectional%20Tilt%20and%20Vibration%20Sensor%20Datasheet%20and%20App%20Notes_2005-01-24.pdf | Get the datasheet here]].

Looking at page six, I noticed a very clear caution to not enable weak pull-ups when connecting to the pic's input port. Yeargh. First, I recognized the term "pull-up" from Tom's class, but had never heard it used in relation to the microcontroller. A bit of time at the search engine showed that all the datasheet meant was that if the tilt sensor were connected to a port B, to make sure that that port is not set to low. Since the sensor operates on such a low current (0.25 mu amps), that setting the pin to low might not allow enough current through to power the sensor.

Also on page six, I found it interesting that there is no lead that connects to power. You solder directly to the gold sensor body.

Here is a graph of the sample output:

http://itp.nyu.edu/~gak217/fall05/sensor/assignment2/tilt2.jpg

An important feature of this tilt sensor is that once motion has stopped and the sensor is at rest (the "reset" part of the graph), it rests in an open OR a closed position. Therefore, the transitions and not the state of the switch are most important.