monitoring milliamps with 16f877

Can anyone tell me if it's possible to monitor the ma output of a pressure transducer or any other sensor for that matter. I'm working on replacing my older style electromechanical well controls and controlling them via a pic and heavy duty 220amp relays. I have 2 wells and they don't always stay in sync.

I have access to a cheap pressure transducer 0-150psi and the output is 4 to 20ma. I can get one for a couple of dollars but I didn't see a post anywhere that anyone has written any code or has any example of reading milliamps.

If anyone has an example I would appreciate it.
thanks
David

Convert to voltage.
http://www.omega.com/techref/das/4-20ma.html
Then use the ADC on chip
http://rentron.com/PICX2.htm

Put a resistor from the current supply to ground. Calculate the value so 20mA works out to 5v (or your PIC operating voltage). This will work for a hobbyist ... if you need high "product"quality, then use an op amp to buffer it.

Thank you for the great examples and links I appreciate the help this is just what I am looking for.

David

Does anyone have the power/inclination to get rid of this guy from the forum. He has 15 posts so far and of the 6 or 7 I've come across so far not one is related to ... well anything. Maybe he has a real post in here somewhere that I missed, but it seems like he is only trying to get hits to his website. Also, in a related note I've come across the ignore user option, does anyone know will this prevent posts from appearing as new if the ignored person is the only one to post a new reply, or will I still be clicking on his quotes just to see his name and
"This user is on your Ignore List."?

As for the 4-20 ma converter. I've been wanting to try this for a while, does anyone know if I use a 1% resistor as suggested and an op amp, is this pretty much commercial ready or is there a lot of other supporting circuitry. We occasionally purchase a 4-20 ma to serial converter for like $280. It works well and has a lot of unused features, but it seems like I could make a good sized batch of them for under 200 and that would be paying more than I should.:cool: I I would just hate to hear complaints from the field that there 0 to 60,000 pound application sits at -3 instead of 0.

David

Hi, Lucky

The most upper right symbol on the post border ... ( exclamation mark in a red triangle )

is the Warning for moderators ... just click it and write " SPAM " or Whatever you want ...

Alain

Quote:

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Originally Posted by Luckyborg

Does anyone have the power/inclination to get rid of this guy from the forum. He has 15 posts so far and of the 6 or 7 I've come across so far not one is related to ... well anything. Maybe he has a real post in here somewhere that I missed, but it seems like he is only trying to get hits to his website.
David

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Are you talking about me?

No, it was about someone else, it looks like the moderators took care of the person and deleted his posts. Your posts are all valid.

Quote:

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Originally Posted by DavyJones

Are you talking about me?

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Hi, David

Keep cool ... this thread ( between others ) was spammed and our moderators have wiped out this junk ...

"this guy" is , of course, not you : I've counted 15+ spams on the whole forum ...

Alain

Quote:

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Originally Posted by Acetronics

Hi, David

Keep cool ... this thread ( between others ) was spammed and our moderators have wiped out this junk ...

"this guy" is , of course, not you : I've counted 15+ spams on the whole forum ...

Alain

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hehehe ok sorry about that I thought I was doing something wrong or asking the questions the wrong way. I didn't want to get booted if I wasn't following the rules. The people here are great and I could not have completed one project without them.
Thanks