Pressure Sensor circuit help

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Wow, they are pretty cool aren't they. Thanks for the info - I may use them in the future from some other ideas. At the moment I am enjoying playing around with what I am doing as I am learning stacks and progressing well.

Once I have it all completed and working I'll take photo's and post a completed cicruit.
 
richacm said:
That would be fantastic thanks. Been looking at the applications in the 7805 datasheet and couldn't figure out one that would suit.
Click to expand...

Hi,
Added a 7805 Vreg to your circuit, also some decoupling caps.

The heat sink on the 7805 may not be required, depends upon the current load of your project.

EDIT: the 20mA current per LED calculation needs checking,, I = [Vpin-Vled]/Rs .
 
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They are probably only deal in industrial transducers....

In case you did not go and do the search at digikey:

Digi-Key - MPX4080D-ND (Freescale Semiconductor - MPX4080D)

is an amplified 0-5V out with 0-11PSI in for $15
 
Went to the digi key site and choose a few components I wanted. When I went to checkout they said the shipping to NZ was over $80! Even rang them up and asked why it was so expensive, they just said it was the standard cost of shipping internationally....pitty cause other sites do it for under $10. I will hunt around for equivalent parts elsewhere.

Thanks for looking that up for me.
 
ericgibbs said:
Hi,
Added a 7805 Vreg to your circuit, also some decoupling caps.

The heat sink on the 7805 may not be required, depends upon the current load of your project.

EDIT: the 20mA current per LED calculation needs checking,, I = [Vpin-Vled]/Rs .
Click to expand...

That is absolutely fantastic....couldn't ask for anything better. I much appreciate the work involved. If you weren't the other side of world I would offer to buy you a beer
 
Not a problem. If you look around you should be able to find distribution locally.

Distributor Network

for their NZ distributors.
 
I have updated the circuit with all your replies.

I have included the 7805 like you described and I also placed in 2 ULN2003 components to drive the LED's. Did my calculations based on a 5V supply to the LED's. If it was a 12V supply then the Resistor value would be 450hm:.

I've also thrown another spanner in the works as I forgot to mention that the LED's will be about 4-5 meters away from the components. I have therefore placed a capacitor on the 5V supply. Is this all I need to do? For long distances does it matter whether 5V or 12V are transmitted on the wires?

Cheers,

Craig
 

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Morning Rich,
Check the voltage supply to the anodes of the LED's, where is it.??
Whats the [LED] 100uF going to do, wired in that way..
 
I thought that...I just saw it on a diagram somewhere during my searches. If I place it in parallel will that take care of the long wire?
 
Last edited:
Hi.
You always need to install a negative feedback "Variable resistance" so you can adjust the output signal the way you want it.
 
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