Continue to Site

Welcome to EDAboard.com

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.

Register Log in

vibration monitoring with 8051

Status
Not open for further replies.
B

boetaw

Newbie level 6
Joined
Dec 9, 2005
Messages
14
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,396
cd4044 output current

Are there possible ways to monitor the vibration of machine with 8051 microcontroller? the sensor output may be 0 to 5 v or 0 to 20 mA or 4 to 20 mA.
 

vibration monitoring analog comparator

It's tough with a small microcontroller. But it can be possible with some analog tricks. Vibraton of industrial equipment is a tricky thing.
What type of condition do you need to detect? What algorithm do you want to use?
 

vibration sensor+8051

I want to detect the vibration from the machine bearing via 4-20 mA output vibration sensors. I want to use LCD to display the level of vibration and want to set a alarm point at for a vibration condition (eg. 1.24 mm/s or 5.123 mA).
 

boetaw said:
...want to set a alarm point at for a vibration condition (eg. 1.24 mm/s or 5.123 mA).
Click to expand...

What's the physical meaning of 1.24 mm/s? Looks like speed.
Is the whole bearing fixed with respect to ground or is it moving (like on a vehicle)?
Do you know what sensor you are going to use?
 

1.24 mm/s is displacement pickup from the accelerometer. At this condition the accelerometer output may be 5.123 mA. the sensor is on the bearing of the generator (stationary on the ground). I have already chosen the sensor from IMI.
 

Connect a 250 Ohm resistor between the 4-20mA line and ground. Current is converted to voltage. On top of the resistor, 1v corresponds to 4mA and 5V corresponds to 20mA. Connect the voltage to an analog comparator (e.g. LM393). Connect the comparator to the set-reset talch (S-R latch, CD4043 or CD4044). Connect the output of the S-R latch to 8051. Does that sound like a workable solution?
 

    B

    boetaw

    Points: 2
    Helpful Answer Positive Rating
I have already chosen the sensor from IMI.
Click to expand...
It means now you need a PROCESS MONITOR/CONTROLLER, please check this article.
 

    B

    boetaw

    Points: 2
    Helpful Answer Positive Rating
If IMI 641Ax1 4-20mA output sensor is used, can the output current be converted into 1-5 volt by a 250 ohm resistor and this voltage is fed to the ADC 0808 and then to the microcontroller AT89S51. Is it possible?
 

4-20mA output sensor is used, can the output current be converted into 1-5 volt by a 250 ohm resistor and this voltage is fed to the ADC 0808 and then to the microcontroller AT89S51. Is it possible?
Click to expand...
Yes, it is possible.
Remember that 1 volt (51 ADC readout) is equivalent with 0% sensor output scale and 5 Volt (255 ADC readout) is equivalent with 100% sensor output scale
 

boetaw said:
If IMI 641Ax1 4-20mA output sensor is used, can the output current be converted into 1-5 volt by a 250 ohm resistor and this voltage is fed to the ADC 0808 and then to the microcontroller AT89S51. Is it possible?
Click to expand...

May i know IMI 641Ax1 is what type of sensor? Is it current sensor? Please teach me how to apply this sensor.

Thank You.
 

Hello!

I want to detect the vibration from the machine bearing via 4-20 mA output vibration sensors. I want to use LCD to display the level of vibration and want to set a alarm point at for a vibration condition (eg. 1.24 mm/s or 5.123 mA).
Click to expand...

I did something similar with an analog accelerometer. I cannot disclose detail, but
I can disclose a very similar application. Have a look at this one:


**broken link removed**

and also this one is fun:

**broken link removed**

I am aware this is not a 8051 but if you are not absolutely constrained to use
this device, that may give you references.

Pascal
 

freescale MMA6270QT (x,y) MMA1260D (z)
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top