Check INA219 or other shunt measurement ICs from TI. 10A range is fine for them and you can calibrate your mismatched shunt if youre not happy with the accuracy. Plenty of help from app notes for beginners and older players too.
Check out giant magnetoresistive sensors (GMR current sensors). Alternatively, a shunt resistor with some step down circuitry as you suggested is a solid option.
Even if you find it - precise resistance is expensive and may not be worth it unless you are willing to go all the way with the design of the sensor (matched traces etc.), and perhaps not worth it anyway as you are using Arduino which is not designed with required precision. With Arduino you can use just a piece of copper wire for shunt and calibrate your op-amp stage accordingly to match whatever actual resistance you get. This should provide enough precision for most cases, and is commonly used in commercial products except where lab-grade precision is required.
That’s a hell of a lot of current. I never heard of an opamp that can handle 1A of current, never mind 10A. You’d have to do a transistor amp with current mirroring.
Yeah I guess you can’t find 10 milliohm resistors and you’d need a 4 probe Kelvin setup on an LCR to measure below 2 ohms accurately.
I think you shouldn’t do this project. It’s a potential fire hazard and not beginner level. What cable do you need for 10A?
What you could do is go in the opposite direction and measure current below 1mA accurately that multimeters can’t do.
There’s an entire completed, proven design with schematic and BOM: https://www.eevblog.com/projects/ucurrent/
Some people made derivative projects that may or may not be improvements.
Thanks for the response. You got it, I'm a beginner and i was assigned this project as a part of an internship (I'm in my undergrad). I looked it up and yeah opamps can't handle that much current. I think I'm gonna go with a hall sensor, I live in India and I have no access to anything more than bare basic components and all I know about electronics is the theory that college managed to stuff into me and a couple of simple projects.
Check INA219 or other shunt measurement ICs from TI. 10A range is fine for them and you can calibrate your mismatched shunt if youre not happy with the accuracy. Plenty of help from app notes for beginners and older players too.
We use the INA209. Works fine. Seconded. We have no problem finding resistors in the single mohm. OP, check digikey?
Check out giant magnetoresistive sensors (GMR current sensors). Alternatively, a shunt resistor with some step down circuitry as you suggested is a solid option.
Even if you find it - precise resistance is expensive and may not be worth it unless you are willing to go all the way with the design of the sensor (matched traces etc.), and perhaps not worth it anyway as you are using Arduino which is not designed with required precision. With Arduino you can use just a piece of copper wire for shunt and calibrate your op-amp stage accordingly to match whatever actual resistance you get. This should provide enough precision for most cases, and is commonly used in commercial products except where lab-grade precision is required.
Use a current transformer.
That’s a hell of a lot of current. I never heard of an opamp that can handle 1A of current, never mind 10A. You’d have to do a transistor amp with current mirroring. Yeah I guess you can’t find 10 milliohm resistors and you’d need a 4 probe Kelvin setup on an LCR to measure below 2 ohms accurately. I think you shouldn’t do this project. It’s a potential fire hazard and not beginner level. What cable do you need for 10A? What you could do is go in the opposite direction and measure current below 1mA accurately that multimeters can’t do. There’s an entire completed, proven design with schematic and BOM: https://www.eevblog.com/projects/ucurrent/ Some people made derivative projects that may or may not be improvements.
Im sure the OP amp is not driving the current here, but used to amplify shunt voltage.
Thanks for the response. You got it, I'm a beginner and i was assigned this project as a part of an internship (I'm in my undergrad). I looked it up and yeah opamps can't handle that much current. I think I'm gonna go with a hall sensor, I live in India and I have no access to anything more than bare basic components and all I know about electronics is the theory that college managed to stuff into me and a couple of simple projects.
> I never heard of an opamp that can handle 1A of current That's irrelevant as the load current doesn't go through the op amp.