morning 29,
The 4060 is the period timer that opens a counter gate that allows the 16500 thru 18000Hz signal to clock the input of a 4040, a 12 stage binary counter.
Look at Fig #5 of the 4060 datasheet for a suitable crystal based circuit.

The vibro sensor output is already 0/5V levels, so the logic IC's should be powered by +5V

On your handwritten circuit you have shown 16500Hz as being 25% loading.? I would have said that 16500Hz is zero load.?
17000Hz as 33%... 17500Hz as 66% and 18000Hz as 100%, so thats only 3 set points.?
Do you agree.?

I will post a block diagram.
Eric
BTW:
For interest only I designed and programmed a 12F683 PIC, to give a logic High on pins to show the the 3 set points.
Its uses only a 39 pence PIC!

 

thank you sir

plz give me block diagram as soon as possible

apart from this
do u have facebook account

 

Hi,
This is a very basic block diagram, you work out the decoding and I can check it out.
If you prefer, its possible to use a Res/Cap for the 4060 oscillator, in that way you can have different Gate period if required.
E

 

thanku very much eric si,
now i get the idea
let me stdy it and if any query i find will text you

apologize to again disturb you sir
i can not understand the operation at the in put at cd4081
where the 1st input is o/p from the vibro sensor and the second input is 1hz frequency
so plz tell me how does that and gate logic circuitry will process ...
and when will be o/p pin no 3 of and gate is high to clock the cd4020.

 

The 4081 is a 2 input AND gate, both inputs, pins #1 AND #2, have to be High for the output pin #3, to be High

 

This thread has been moved from Electronics Resources to The Projects Forum.

 

hi 29,
This list should help with your gate decode logic, I have outlined in Red the closest frequency values.
Note that 2xxx occurs for all values.
E
Corrected!

 

hi eric sir.
sory for the late
sir we have decided to go with the pic micro controller solution ,
plz give me the details of it that u have design for pic microcontroller (kl66 vibro sensor)
thanks
regards
nikhil

 

hi,
I have used a 12F683 PIC.
The PIC uses the internal crystal at 4MHz.
The program uses Tmr0 [pre-scale 64] together with a software down counter [ set for 61 ] to give a Gate period of ~1 second [ ~0.999424]

Tmr1 is clocked externally by the 16000Hz thru 18000Hz sensor signal, which gives a Tmr1 count value of 15,999 thru 17,989Hz.

You have two options in your program.
1, Compare the Tmr1 count with the 3 zone, set point frequencies, and set a GPIO pin High for 3 pins when the count exceeds the set points.
or
2. Use PWM and an external Res/Cap filter, where the Duty cycle of the PWM is set by the frequency [ subtract 16000 from the Tmr1 count and divide by 2, to give a duty cycle value of 0 thru 1000. [ this will give a PWM ratio of 0 thru 100]
From the output of the Res/Cap filter you could have a LM393 window comparator set to give a set point switching level.

I hope you can follow these details as requested

Eric.
Have you now got two usernames on AAC.?

 

yes sir,but for the first account i forget the password
so i created new one
and surely i will follow the instructions
thank you

and sir
if i use the 8051 microcontroller ic ,what does it makes the difference in between these two,i.e. pic and 8051 microcontroller

 

hi,
Sorry, I do not use the 8051 series of MCU's.

I will check the web for any 'equivalent' program using 8051.
E

I have found these links
https://www.google.co.uk/search?q=8...hannel=sb&gfe_rd=cr&ei=dFkyVMmuO6bn7Aat7YDQBw

 

sir
with the use of pic it will be much difficult for me to understand and implement the concept
coz of the reason i do not have knowledge of pic and how to use it
for to implement your concept sir,you have to give me the step wise instructions,then only it can be possible for me.
and the circuit diagram discription is also needed
if you have the time and if possible plz give me the step wise execution from basic of it and diagram of the concept
thank you
regard
nikhil

 

hi,
With a college assignment, we usually expect to see the work that the OP has done so far on the project and advise on errors and omissions.
If I did the complete program and circuit design drawing, it would no longer be your work.

Please post your version of the project design.

Eric

 

hi sir
the research on this project what i have done is that
my simple plan was to convert the frequency in to the voltage then that corresponding voltage for specific load is compair with fix voltage by means of quad core comparator ic,
and in my project if only i could manage to possible to monitor the full load it can be sufficient for me so i can just warning for full load.
i think if you go thrugh the datasheet of ic ,you will get the better idea,
and for this concept where i got stuck that how to convert the frequency in to the voltage
because the base frequency of vibro sensor is 16500 ,and i dont get any good circuit to convert the high range of this frequncy.

plz see fig no 29 from the previous attachment

hi sir
i want to track cutoff voltage in load cell
"
load cell is giving fix o/p for some fix load suppose for 500kg it is giving the let us say,20 mv
so at that point i want to ON my 24 volt dc relay
so can u plz suggest me solution for it

 

hi,
You need to amplify the 20mV , say by 50 times upto 1V, then use a comparator IC to compare the 1V signal with say a 1V set threshold voltage.
The output of the comparator would drive a transistor/relay circuit.

I could post a circuit, but I need to know, is the 20mV Load Cell output a differential signal.? and what is the CMV [ common mode voltage of the load cell output.?]

E

 

I see the LM2917 mentioned above. Will it work ok at frequencies above 12kHz? The highest frequency mentioned in the National Semi datasheet for that IC is 10kHz (albeit in connection with output linearity, not a limit).

 

hi alec,
The OP dropped the LM2917 solution some posts ago.
Eric

 

Oh. Missed that .

 

hi sir,
i have attached pdf file for load cell,
plz find the attachments,
i have apply the i/p 11 v and i m monitoring o/p
and i found ,following
when i apply the i/p supply my mv o/p on the dmm is -0.5 mv.
when i apply 50 kg then i found dmm reading 0 volt...
plz sir go thru the pdf and plz tell me the meaning in parameter...i.e.what is standard capacities (50,100,200,500,1000),
and nominal o/p 2.0mv/v.
......
and what i knw about load cell is that ,
if the load cell is rated for 6 kg and its o/p is 2mv/v
then for at its rated load it should produce o/p of 2.0 mv.
...
but for my above case i didnt get the idea,,
coz there are ...range of standard capacities.
plz find the attachment and tell me.
and for this load cell i have to conditioning its o/p ...what i was had asked u..
and o/p of this load cell is measure with the ground not the differential signal.

sir,
i think this load cell will give me o/p of 2mv for 1000 kgf
and sir in my project i want to monitor that 500 ,and 1000 ..
so jst want to make the simple circuit that will trip the relay when input to that circuit is 2mv
means the simple comparator circuit ,..
is it right sir..
and for this purpose if u can plz suggest me solution and which ic should i use for comparision purpose..
i am think that quad core comparator ic(lm339) will work..

??

and does it possible to implement this application by using simple 741 opamp

 

and does it possible to implement this application by using simple 741 opamp

Morning.
The 741 is not suitable for a load cell project working at mV levels.

plz sir go thru the pdf and plz tell me the meaning in parameter...i.e.what is standard capacities (50,100,200,500,1000),
and nominal o/p 2.0mv/v.

Standard capacities mean the maximum load the load cell should be used to weigh ie: 100 means 100kG max load.
The output of a load cell is stated in mV/Volts excitation. so if you power the load cell with 5Vdc, rated a 1mV/V at max load you will get 5mV out at 100kG.
If the LC [load cell] is rated at 2mV/V, then at 100kG you would get 10mVout.

If you had V excitation of 10V and a 2mV/V, at 100kG you would get 20mVout.
At 50kG load the Vout would be 10mV

I am assuming your load cell is of the Bridge type, am I correct.?

If so, you need a Instrumentation Amplifier, eg: AD623 or equivalent.

Do you follow OK.?

E