Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
This measures the change of orientation of some object or place. In oil well work, the pump high pressure water into the well and tilt sensors back up at the surface of the earth indicate where the water is going horizontally. This overall procedure is used to make cracks in the rock layers and let the oil flow more freely into the vertical hole so it can be pumped out more rapidly.
Any accelerometer can by used for Z-axis. In fact you can use singles for all 3 directions. I think they have 3-axis accelerometer - the ADXL-05 - but it looks it is obsolete ..
2g = 2 x 9.81 .. 5g = 5 x 9.81 etc.
If you don't expect higher acceleration you can select 2g; I think safer will be 5g..
After all you probably don't need 0.1° accuracy .. do you?
Any accelerometer can by used for Z-axis. In fact you can use singles for all 3 directions. I think they have 3-axis accelerometer - the ADXL-05 - but it looks it is obsolete ..
In standard applications a gyroscope gives you two-axis orientation: 0 - 360° (similar to a compass).
3 accelerometers will give you 3-axis readings.
I think you should stick with this arrangement..
thanks too much IanP for your help ...u are a very helpful person :sm28:
but in my application uav rc plane .........i may need to calculate the degree of rotation around an axis ..........i read in the data sheet of accelerometer that it can be use as tilt by the equation a=asin(Vx/1g) where Vx is the voltage represnt the accleration around the x axis ..............so can this equation be calculated easly in pic knowing that i am using pic18f452 in my graduate project
i donnot know really if i will need in the system of the rc plane to calculate the acceleration around the axis or the degree of rotation only
You just need to measure rotation and if you apply Low Pass Filter to the accelerometer output you will be able to filter out anything else except rotation component.
For calculation purposes I would use a "look up table". You can create it by calculating values using a calculator or PC, or you can build a circuit with single-axis accelerometer and measure values for every degree of displacement.
(Implementation of this equasion on PIC can be rather complicated)..
IanP the idea of look up table is very good idea ....i donnot know how thank u
but i didnot understand
You just need to measure rotation and if you apply Low Pass Filter to the accelerometer output you will be able to filter out anything else except rotation component
do u mean that the output of accelerometer which is the value of accleration of rotation when applied to a low-pass filter .....it will output rotation value?
What I mean is that the LPF will cut off spikes or pulses created by sudden acceleration and will give sort of average voltage which can be then converted by A/D and used for tilt calculations..
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
