Folks,
Has anyone dealt with those ? I'm thinking about using one for TinyBMS, which is originally intended to go with 750A version of LEM sensor (DHAB S/133). It is much cheaper to acquire 200A versions of LEM sensors, and it would be sufficient for my applications.
Now the way I understand it, that LEM puts out a voltage in the range of 2.5 - 5v, proportionately to the sensed current. So 2.5v at zero amps, and 5v at 750 amps or 200 amps, depending on the sensor. So in the absence of ability to change the calibration on BMS side, one would have to do some magic with the voltage conversion to get the correct reading ?
Are there off-shelf devices that can do that ? For DIY I was thinking it's possible to do the voltage conversion using op-amps, and also digitally with Arduino, but perhaps there is a more straightforward path.
Finally, perhaps there is a cheap alternative to DHAB DHAB S/133 ?
Has anyone dealt with those ? I'm thinking about using one for TinyBMS, which is originally intended to go with 750A version of LEM sensor (DHAB S/133). It is much cheaper to acquire 200A versions of LEM sensors, and it would be sufficient for my applications.
Now the way I understand it, that LEM puts out a voltage in the range of 2.5 - 5v, proportionately to the sensed current. So 2.5v at zero amps, and 5v at 750 amps or 200 amps, depending on the sensor. So in the absence of ability to change the calibration on BMS side, one would have to do some magic with the voltage conversion to get the correct reading ?
Are there off-shelf devices that can do that ? For DIY I was thinking it's possible to do the voltage conversion using op-amps, and also digitally with Arduino, but perhaps there is a more straightforward path.
Finally, perhaps there is a cheap alternative to DHAB DHAB S/133 ?