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.
Hi Karesz
Is me again,........the circuit is great......n now, i m doing a program display on LCD by connecting 8051.....my problem is that........the V+ is no much change whatever my force is adding on the sensor ...........therefore i cant get the value as same as the voltmeter
plx help
Hi Karesz
I havetried yr updated version...
it seems still dun work.......
help again
Added after 3 minutes:
at forceless situation.......the Uref is close to 0........the voltage is still no change when apply force on it...
thx a lot
Added after 40 minutes:
sorry Karesz
after...
Hi karesz
as u said...........i just
1. my Uref is around 1.7V at forceless........n no change when apply the force
2. i just connect U4, R7 without R5, R6, P3, P2 n U3......am i correct ???
thx a lot
Added after 10 minutes:
also...
1. when i connect U3, P2, R7 without R5, R6, P3, U4...
Hi karesz,
i have a few of quesions.
1. my adc0804 Vin is 0V and ref/2 is around 3V at the beginning...does anything wrong ???
2. if i use 10k ohm for P1, is it ok ???
3. we no need to connect 5V to force sensor ???
4. what pin should i check for the voltage ???
i really have many problem...
Hi karesz,
Thx very much...................i will follow yr circuit tmr...............very thx.....i hope this can help me to read the value from 0V to around 5V ^^
Hi pranam77
i cant use the voltmeter, cos my sensor is limited to current..............so what i can do is measured the ohm instead of voltage..........
can u give me some hint how to connect to 8051 and adc 0804 ......
by the way....i have write some source code to display the...
thx a lot .......
is that display the measured resistor value on lcd by 8051 and adc0804 ......
i think i give up to use current to voltage circuit ,,,,cos it only to use 1kg force that is not enough for my situation.....
thx a lot
Hi karesz
i m very appricate your help.....but it is a bit difficult for me.....
can you give me some hint to make a ohmmeter by 8051 and adc0804...
thx a lot
Hi karesz
how can i connect with dual sided supplies with Ref-voltage negative.....i dun know at this point
thx a lot
Added after 24 minutes:
Hi karesz
thx for your help.....after consideration, i tihnk i may do a ohmmeter .....cos the max force of this circuit is 1lg, but in my...
Hi karesz
sorry......
accodring to fig 15 from datasheet..........i use 4.7k ohm as RG, V+ connect to ground.........if at forceless situation, the voltage is 2.5V...........when i use a smaller value of resistor, the voltage decrease............and the voltage is saturated around...
for example..............i would like to read the value let say 100 ohm resistor display on lcd............is it possible ???
and how to connect with 8051 and adc 0804 ??? is it just like the connection as voltmeter ???
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.
