hi there !!
anyone can give me some info how to interface 4-20mA signal from pressure transducer to a PIC ? Any suitable device to use ?
Thx !
hi there !!
anyone can give me some info how to interface 4-20mA signal from pressure transducer to a PIC ? Any suitable device to use ?
Thx !
op-amp in between? Change the current reading into voltage...
Or use something like
http://focus.ti.com/lit/ds/symlink/rcv420.pdf
if still available ...
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
Or just take a resistor of 250 ohms.(4 resistors of 1K in parrallel)
Connect 1 point of the resistor to an analog input of the processor and the + output of the current device. The other point of the resistor to the gnd of the processor and the - output of the current device.
The you will have 0 to 5 volt for 0 to 20 mA.
The 4 mA (1volt in this case) you subtract in the programm and the rest is your value.
Hi,
(Read first Mat Janssen post).
See this link:
http://www.processautomationcontrol....oop-Primer.pdf
Best regards,
Luciano
when i made an Airspeed and altitude recorder for my RC planes, i used an opamp between the pic and pressure sensors.. it worked well, if i can find the documentation for it, i will post it...
if you search for model rocket altimeter schematics, you will find lots of people that have used pressure sensors with PICs.
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