ESP32 Modbus RTU and measuring miliamp current

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brunofunchas

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Hi!

Is it possible to use Modbus RTU directlly on the pins of an ESP32? Using arduino framework on VSC. Or should I use a MAX485?

For measuring miliamp current in a 240Vac system can I use ACS712? Is there other option?

Thanks,
Bruno
 

brunofunchas said:
Hi!

For measuring miliamp current in a 240Vac system can I use ACS712? Is there other option?

Thanks,
Bruno
Click to expand...

Hello,

you can choose: ACS70331

Here is link to it :

https://www.digikey.com/product-detail/en/allegro-microsystems-llc/ACS70331EESATR-2P5U3/620-1890-1-ND/8120690

These sensor have smaller noise (8ma for 1MHz band), and bigger sensibility. For AC current you have to average a half of period (for sinus curve).

For first question - yes using a Max485 is simpler(and in my opinion better) option.

Regards
 
Thanks,

I'm going to look at it. I will have to hand soldering the PCB so i will look to other type of Package / Case.
 

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