Pic Ammeter

[RYTECH]

I've obtained several max4172 SOIC IC's. Could somebody help me get started with the current sense of my 12v source. The mesurable range should be between 0 and 1 amp (lets start with just metering the logic part of my project).

I will be using the 2nd A/D channel on my pic as the first is used to sense battery voltage.

what i need is a schematic with some explanations, the datasheet seems compllicated and doesnt explain how to interface to the pic.

Thanks

[AMay]

If you just want to measure the current, get 1% .1, 1 and 10 ohm precision resistors, put them in the circuit one at a time, and measure the voltage drop.

If you want a permament meter, use the .1 ohm, and get one of the cheap volt meters which run on a 9v battery. Set it accross the resistor, and set it to one of the low ranges.

Resistors are available from Mouser 71-RS5-.1 etc. I think Circuit Specialists has the best deal on Meters.

Good luck

[RYTECH]

can i get some more help interfacing the max4172 ic's... i'm having a hard time with figuring out what resistor values to use in my circuit

the input source voltage is 5v's the ammeter should be able to monitor between 0 and 2 amps.

[JIM A]

THIS CIRCUIT SHOULD DO WHAT YOU WANT. NOTICE THE INACCURACIES BELOW 40-50mA LOAD CURRENT. THIS COULD BE COMPENSATED FOR, BUT WOULD ALLOW LESS VOLTAGE FOR THE LOAD.






http://rapidshare.com/files/312322/MAX4172_EX.TIF

[majoka]

hi ero
i see ur reply on pic ammeter page

The schema can be loaded from following link.

http://rapidshare.de/files/10143993/ampoku.EMF.html

but this link is dead nw
can u provide the new link please or any one can provide who have this schmetic

[ero]

I do not remember what was in the file but I collected some of similar files which I had worked before . Pls. check the file in following link. I hope it helps you.

Ero

http://www.4shared.com/file/2cBbcmL7/ampoku.html

[majoka]

thank u so so much it solve my problem greatly