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ocrdu
ocrdu
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Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 ampsA and a voltage range of 0-24V24 V. 

The voltage measurement is fine but I have questions about the current measurement. For For measuring current, I plan on using a MAX4081TAUA+ to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5V5 V and the voltage gain of the amplifier is listed as 20V20 V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5 / 20 = 0.25 V, so the resistance of the shunt should be about 1m1 mΩ. Is this correct and will this give a reasonable accuracy? Thank you.

Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. For measuring current, I plan on using a MAX4081TAUA+ to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5V and the voltage gain of the amplifier is listed as 20V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5 / 20 = 0.25, so the resistance of the shunt should be about 1m. Is this correct and will this give a reasonable accuracy? Thank you.

I am planning to use an Arduino to make a joulemeter for a current range of 0-30 A and a voltage range of 0-24 V. 

The voltage measurement is fine but I have questions about the current measurement. For measuring current, I plan on using a MAX4081TAUA+ to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5 V and the voltage gain of the amplifier is listed as 20 V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5 / 20 = 0.25 V, so the resistance of the shunt should be about 1 mΩ. Is this correct and will this give a reasonable accuracy?

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Andrew
Andrew
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Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. For measuring current, I plan on using thisa current sense ampMAX4081TAUA+ to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5.5V5V and the voltage gain of the amplifier is listed as 20V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5.5 / 20 = 0.27525, so the resistance of the shunt should be about 1m. Is this correct and will this give a reasonable accuracy? Thank you.

Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. For measuring current, I plan on using this current sense amp to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5.5V and the voltage gain of the amplifier is listed as 20V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5.5 / 20 = 0.275, so the resistance of the shunt should be about 1m. Is this correct and will this give a reasonable accuracy? Thank you.

Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. For measuring current, I plan on using a MAX4081TAUA+ to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5V and the voltage gain of the amplifier is listed as 20V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5 / 20 = 0.25, so the resistance of the shunt should be about 1m. Is this correct and will this give a reasonable accuracy? Thank you.

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Andrew
Andrew
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Arduino current measurement

Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. For measuring current, I plan on using this current sense amp to amplify voltage across a shunt.

The Arduino internal ADC can read up to 5.5V and the voltage gain of the amplifier is listed as 20V/V. From my understanding, at maximum current, the voltage across the shunt resistor should be 5.5 / 20 = 0.275, so the resistance of the shunt should be about 1m. Is this correct and will this give a reasonable accuracy? Thank you.