electronic adapter

[procos]

input signal : sinus form or rightangled form
grade : min.2mVref; max 6Vref
frequance : f= K*Q ------ 0-10Hz, 0-1100Hz
K- CALIBRATION FACIENT OF FLOW TRADUCTOR
Q - FLOW
ouput signal : 4-20 mAcc ; 0-10Vcc
undertaking resistence : 0-800 ohm for 4-20mA ; >2000ohm for 0-10V
alimentation : wathever( 220 V , 110V, 24 V, 5V)
any idee is very good.
thanx all.

thanx for any answare.
bye

[procos]

is feasible with PIC16F873 ( TIMER 1 - 16 BITI)

[ckielstra]

What is your question????
You give a lot of specifications, but it doesn't make any sense to me. what do you want to do?

Your input signal is both changing in the 0-1100Hz frequency range and the 2mV to 6V range at the same time???

Your output is a standard 20mA current loop, but what resolution do you want to achieve (how many bits)?

Please provide more information.

[procos]

sorry
grade : 2mV actual value to 6V actual value

10,12, 16 biti


palet turbine intersect magnetic field create of permanent magnet and create one electropower in bobbin.
frequance of this tension = rotation speed of turbine x number of palet
rotation speed of turbine is proportional with flow range

[SherpaDoug]

For the input you need a comparator (LT1011 comes to mind) to take a signal as low as 2mV and make in into a logic signal to drive the PIC. Give it a little hysteresis so it won't oscillate or pick up noise. The datasheet of the LT1011 describes this.

You can use any PIC with PWM to generate a DC output. You will need some amplifiers to get 0 to 10V and to get the 4 to 20mA from the PWM voltage.

Any PIC can do the math. The 220VAC to 5V DC power supply is another whole can of worms! I would design the circuit for 5VDC, and use adapters to turn the other voltages into 5VDC.
_________________
The search for better is endless. Instead simply find very good and get the job done.

[procos]

thank you SherpaDoug and ckielstra
i can show some schematic .
The pic with PWM who can use is: 18f242-i/sp.
is a flash and i can programate more times.
and stiil a littel:
with this signal i want define 3 parameters
1) time of fuction
2) total flow
3) instantaneous flow
i can ?
i need and date end time real (dalas ds1287 or motorolla mccs146818)
can i help my with one schematic?
i am newbie.
thanx very very very much
best regardes
constantin

[Guest]

this is you want to do?
http://www.hofferflow.com/products/products.htm
Model 314I Digital Flow Totalizer/Rate Indicator

[procos]

yes.true



3 butons
yes

[SherpaDoug]

Read through the datasheets for the chips you intend to use. Then if you post a .pdf or .jpg of your schematic we can comment on it. Note support may be rather sketchy for the next 2 weeks with the holidays.
I also recommend you get a flowmeter on your desk you can spin with your finger or breath and if possible an oscilloscope so you can see how the signals look.
_________________
The search for better is endless. Instead simply find very good and get the job done.