Consider a small piece of solder epoxied to the needle of a phono pickup for high audio frequency accelerations.
Consider a speaker with a lead weight glued in center and lots of holes punched for lower frequencies.
Make an (RF) tuned circuit tuned by a small coil with a sliding slug. Suspend slug on small brass coil. Read oscillation frequency off into comparator, divider, and into pic.
Now, a 3D version: Get a hollow cylinder and fill with alcohol (water will get bacterial growth), put a pressure sensor on each side of each axis (one at each pole and 4 on equator). Pressure on sensor is proportional to the acceleration in that direction. eliminate sensors in uninteresting directions. If you only want 1 direction, just use a length of plastic tubing, if you know the direction of acceleration.
For a "one bit" maximum value test - suspend a ball bearing in a cage of rubber bands. If the ball falls out, you've exceeded the limit.
http://www.measurementspecialties.com/vibration_dynamic_sensors.htm Measurement Specialties (formerly AMP) makes a piezo polymer vibration sensor (LDTM-028K) with an attached proof mass that functions as a cheap accelerometer: These are $.86 at Digi-Key. They put out several volts of reversing polarity as you wave them back and forth. This may be adapable as a sensor for this application. They are 1" long by .5" wide, and need some wiggle room, so they are a bit larger than an SOIC or DIP.
|file: /Techref/io/sensor/posdd.htm, 2KB, , updated: 2008/8/29 07:59, local time: 2017/11/23 10:44,
|©2017 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://www.piclist.com/techref/io/sensor/posdd.htm"> Accelleration Sensors</A>
|Did you find what you needed?|
PICList 2017 contributors:
o List host: MIT, Site host massmind.org, Top posters @20171123 RussellMc, Van Horn, David, James Cameron, Sean Breheny, alan.b.pearce, IVP, Neil, David C Brown, Bob Blick, Denny Esterline,
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
Welcome to www.piclist.com!