Probably not much with all the clutter in an elevator shaft.The accelerometer, like the one is just about every smartphone, would be the preferred method. Lots of software and display options to go along with it. You can probably find one for free if it's a couple years old.
Not long ago, a barometer would have been the leading choice, so maybe that's second now.
An ultrasonic rangefinder in the top of the elevator shaft would probably work well for a few floors. Not sure what range is possible.
Do you need to measure anything, or just detect stops and starts on the way up and on the way down?Hi Every one.
I am doing one project in that i need to sense the motion in the lift when it starts. I tried the accelerometer but it didn't worked. Any suggetions will be helpfull to me.
Thanks
If it is the old cable style, now many are hydraulic cylinder.Whats wrong with an encoder on the cable drum shaft?. If the drum moves the lift moves(unless cable is broken, but thats another story)
Thanks DickCappels, for ur suggestions. I will go through it & see which matches best to my application....Just guessing, but maybe your best bet is to get a more sensitive accelerometer.
Other ideas, probably not as good as the accelerometer
• A fluxgate magnetometer could probably sense the changing ambient magnetic field as the elevator moves, particularly if there is plenty of structural steel in the building or elevator shaft.
• A sensitive barometer might be able to tell you when the elevator's altitude changes (and probably when lots of other things happen too).
• Use a GPS receiver and watch for changes altitude.
• Tie a string to the ceiling of the lift shaft and watch a reel wind it in and unwind as the elevator goes up or down.
• Use an ultrasound distance measuring setup to measure the distance to the ceiling or floor of the elevator shaft.
• If the door does not seal tightly, the amount of light entering the elevator will change minutely when it starts to move and that can be detected.
Hey thanks Max. all I need it inside the elevator. & lifts are 90% are cable lift......What type of elevator is it, Cable lift or hydraulic cylinder?
You can get encoders with rubber tyres that could travel on the elevator shaft slide, also easy to make a similar Hall effect or slot opto type of sensor set up.
I assume you want it external to the elevator cage?
Max.
Ya you guessed it right. I need to sense the smallest motion in the lift. for example if lift moves , my circuit gives some text or voice messages to the passengers depending on the lift movement.The OP says he want to detect motion in the lift when it starts, this could mean 'has it started' or 'what degree of motion is it' until known it is up in the air what what is needed, what would work?
Max.
Do you need to measure anything, or just detect stops and starts on the way up and on the way down?
... I need it inside the elevator....
Yet the elevator arrives at some velocity after not moving, therefore it must experience acceleration in addition to the static acceleration of the of the earth's gravity.I am not measuring anything here. today's lifts are more reliable that when they starts, we couldn't feel any force or any motion.
by Duane Benson
by Duane Benson
by Aaron Carman