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I have made some progress on the PCB for a nanogrid consisting of solar panel, wind turbine, batteries, load (not yet connected) this board monitors the current/voltage of each components and sends them to an RPi through arduino nano, here is the latest update of what i made using easyEDA: enter image description here

PS, so for each of the 3-pin input of each power supply, (pin-2 is the positive input, pin-3 is the ground of the supply , pin-1 is the pathway to charge the batteries).

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    \$\begingroup\$ Please clarifiy what voltage / current you expect to see in this system... the current sense traces are almost certianly far too thin. You also have an potential divider that won't work (top and bottom are connected to the same pin), and it's not got a reference, so it doubly won't work. \$\endgroup\$
    – Attie
    Commented Jul 18 at 12:24
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    \$\begingroup\$ Related: electronics.stackexchange.com/questions/719298/…. Also the changes proposed in your previous schematic question hasn't been implmented. \$\endgroup\$
    – winny
    Commented Jul 18 at 16:11
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    \$\begingroup\$ Still lacking decoupling capacitors, no ground plane and if those optocouplers are for isolation, you're breaking it with shared ground on both sides. \$\endgroup\$
    – winny
    Commented Jul 19 at 13:02
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    \$\begingroup\$ where should i put the decoupling capacitors is it for every Vcc? also what is that ground plane i thought i should just use GND where it is needed, why am I breaking the current sensors? @winny \$\endgroup\$
    – Knowledge Seeker
    Commented Jul 19 at 13:07
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    \$\begingroup\$ I read your previous post after my comment, and I think severals have point out the circuit doesn't work. ACS756 is a current sensor IC, it measure the voltage drop between IP+ and IP- over the internal shunt resistor of 1.2 micro-ohm. Your voltage divider of 180k/10k at IP- simply wrong, what voltage you are expecting on the Arduino input? Read the datasheet and try to understand how the chip work, and build a prototype before you make your PCB, otherwise you are simply wasting your time and waste everybody's time for reviewing it. Nobody would make an PCB without building a prototype first. \$\endgroup\$
    – hcheung
    Commented Jul 19 at 14:37

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