Ampmeter for Arduino

166

01:54:53

The 0.1 Ohms resistor is the shunt. The output is 1V/A, so the maximum is 5V for 5A.

published 7 years ago

GLaDOS

7 years ago

WRONG! If you put 5V on the input, it will blow up the resistor

blob

7 years ago

@GLaDOS Not if you power your amplifier under 5V. Then you'll just be saturated.

hurz

7 years ago

@GLaDOS, you do have a voltage source you can draw 50A at 5V from? 250Watt, This is not impossible, but nobody talked about the max power of the shunt resistor. If it is happy with 250Watt, why not? Any more current will just drive the OpAmp into saturation, which is not a drama!

BigKhalPablo

7 years ago

I've designed to measure 5A max. The power of a 0.1 Ohms shunt with 5A of current is 2.5W, enough for my application. And you have to consider that the Op Amp is power with +5V and -0V, so the max output will be aprox. 4'95V, not dangerous.

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