volt/ammeter chip

[robertj352003]

Does anyone have a suggestion for a volt/ammeter chip or microcontroller to measure up to 50v 1a?

[Smokey]

What kind of resolution?
What kind of speed?
What kind of isolation?
What kind of interface?

Simple solution assuming you already have a micro with ADC and don't need isolation (pretty much any uC will work):
         Resistor divide the 50V down to whatever the uC ADC can read.  Watch out for wattage on the resistors.
         Sense the 1A across a resistor and feed that back to a uC ADC.  Again watch out for wattage.

If you need isolation on the voltage sense, look into isolation-amplifiers for the voltage like:
http://www.avagotech.com/pages/www.avagotech.com/isolationamplifiers
You can use those isolation amps on the current across the resistor as well.

If you need isolation on the current and don't need super high resolution, check out hall sensors like:
http://www.allegromicro.com/en/Products/Current-Sensor-ICs/Zero-To-Fifty-Amp-Integrated-Conductor-Sensor-ICs.aspx

[robertj352003]

I need roughly .9 resolution with maybe the speed of a cheap multimeter. As far as interface goes how do you mean?

[PA0PBZ]

As far as interface goes how do you mean?

Where do you want the results to go?

[ve7xen]

Any microcontroller with an ADC should be able to handle this. You need less than 8 bits of resolution.

Maybe some prebuilt panel meters from China are more appropriate for your project though?

[Shred]

Have you seen the INA169?

Adafruit have a breakout board for it:
http://www.adafruit.com/products/1164

http://www.adafruit.com/datasheets/ina169.pdf

I've been playing around with the INA219, which also measures voltage, but it doesn't meet the O.P.'s voltage requirements.

[tbbw]

Have you seen the INA169?

Adafruit have a breakout board for it:
http://www.adafruit.com/products/1164

http://www.adafruit.com/datasheets/ina169.pdf

I've been playing around with the INA219, which also measures voltage, but it doesn't meet the O.P.'s voltage requirements.

Ha!
It did not take me long to find someone with just the post i was looking for here