Alternative Sensor?
phil-barrett opened this issue · comments
Hi, cool project here. I see a number of ways this could be taken. My first question is about the sensor. It is rated for up to 2.5A. My experience is that to be really safe I need to derate. Have you played with any bidirectional sensors that work at higher currents? I see Allegro has quite a few.
Have you looked at the ACS712? It claims to handle up to 20A. Does that make your readings too coarse? I suppose I should dig through the code...
Allegro has a +/-5A unit that should fit on the same board. Need to tell
the firmware through to scale the current readings by x2. For another, non
related project, I am using ACS781LLRTR-050U-T which is unidirectional and
for higher currents and it works just fine.
The ACS712 you mentioned has a +/-5A version and an easier to solder
package, but its bandwidth is only 80Khz, which may or may not be
sufficient, need to think more about it. BTW, the analyzer samples as
100Khz.
BTW, it's also available on JLCPCB as a standard part for SMT assembly so
this is also a plus
https://jlcpcb.com/parts/componentSearch?isSearch=true&searchTxt=ACS712
…On Fri, Apr 23, 2021 at 9:07 AM phil-barrett ***@***.***> wrote:
Hi, cool project here. I see a number of ways this could be taken. My
first question is about the sensor. It is rated for up to 2.5A. My
experience is that to be really safe I need to derate. Have you played with
any bidirectional sensors that work at higher currents? I see Allegro has
quite a few.
Have you looked at the ACS712
<https://datasheet.lcsc.com/szlcsc/Allegro-MicroSystems-LLC-ACS712ELCTR-20A-T_C10681.pdf>?
It claims to handle up to 20A. Does that make your readings too coarse? I
suppose I should dig through the code...
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