Hello all,
Before I buy this sensor for my Arduino, can someone confirm that this sensor and the #include "EmonLib.h" is capable of reading and distingues current in both direction ? ( with a 'mark' , '-' or '+' for the directions )
I searched already for it but can't find it documented ...
If it can, very 'high tech', as this sensor is no more than a transfo .. ( or am I wrong ? )
How do they do it ?
Kind regards.
You failed to provide a link to the device you have so my remarks are based on the devices I found searching for the term.
Before I buy this sensor for my Arduino, can someone confirm that this sensor and the #include "EmonLib.h" is capable of reading and distingues current in both direction ?
Yes, the split core clamp is capable of sensing positive and negative current.
As you also failed to provide a link to the library and a wiring diagram of the planned setup I cannot answer the second question as that depends on the circuitry and the board used.
If it can, very 'high tech', as this sensor is no more than a transfo .. ( or am I wrong ? )
What's high tech about that? A transformator induces a scaled current on the output side. You just have to measure that scaled (down in this case) current but as I wrote this needs additional circuitry.
pylon:
As you also failed to provide a link to the library and a wiring diagram of the planned setup I cannot answer the second question as that depends on the circuitry and the board used.
Link to the library on Emonlib.h
Circuitry seems always the same, example here with this circuitry.
Hope this helps for your answer.
Question was rather directed to people who had already some experience with these SCT-013-000 sensors ...
The SCT-013-000 is just a current transformer and has no polarity.
Use the circuit similar to that shown here to interface it with Arduino.
This product page says the burden resistor is maximum 10 Ohms, which means that the output will be 500 mV peak for 100 Amperes. You will want to use an Arduino with a 1.1V Vref for the ADC.
BartDePauw:
If it can, very 'high tech', as this sensor is no more than a transfo .. ( or am I wrong ? )
How do they do it ?Kind regards.
Its a current transformer, which means the secondary must be shorted at all times through a low-value
burden resistor (operating without this is dangerous as very high voltages may be generated). Being
isolated current transformers (CTs) are very commonly used for measuring mains current.
A current transformer steps down current, although it looks just like a step-up voltage transformer.
In operation the voltages across the coils are very small (due to the output short), so the overall power
consumed is small, which is why it can be pretty compact despite handling 100A
Personally I prefer to use a CT with the burden resistor built-in, so there's no chance of it coming
disconnected and sparks flying everywhere.
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