Hello I'm building a small robot and was planning to build a tilt sensor that should measure acceleration to. I only have the idea I haven't done any testing yet. The idea is to make a small pendulum with a ferrite bead as the weight. Near this will be a coil that is part of a tank circuit of an oscillator as the ferrite bead swings near or farther from the coil the frequency will change and I will keep track of it with one of the timer inputs on a PIC. The pendulum may need to be dampend. I once saw a small scale that had it's beam dampend by having a small copper plate attached to the beam swing near 2 small magnets this would cause eddy currents in the copper and dampen the beam movment. Regards Jim -----Original Message----- From: Pang accelerationacceleration To: PICLIST@MITVMA.MIT.EDU Date: Wednesday, July 10, 2002 12:47 AM Subject: Re: [PIC]:how to use acceleration sensor for motion control? >Hi, > >I have posted some questions on the area of acceleration sensor some months >ago and gain a lot of knowledge from other piclisters. For searching >purpose, the subject of the thread is [EE]:Tilt Sensor. A two axis >accelerometer are basically used to detect both dynamic acceleration >(vibration) and static acceleration (gravity). As such, a dual axis >acceleration can be use to detect vibration, tilting, and acceleration. > >I have given up on searching for a tilt sensor solution because accelerators >are very expensive. ADXL202 is expensive and fragile. You can check also the >accelerators from Memsic, but they are also very expensive (USD14.50). > >As for the rotational sensor, piclisters has suggested on using a optical >encoder or ball bearing potentionmeter or electrolytic tilt sensor. Have yet >to get some samples on that. Perhaps you can consider these for rotational >sensor. > >There could be others which I do not know. > >Rgds, >Pang > > > >Subject: [PIC]:how to use acceleration sensor for motion control? > > >need to control two dimension movement, speed and distance. or may be even >rotation movement. > >how good sensor is needed? 0.01 mg , from analog device, enough? > >acceleration sensor should works, theorically. any example? site? > >BR, > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu