Measure Mains Voltage with raspberry Pi and PZEM-004T ?

[mrfunk]

Hi newbie here. please be gentle

All I want to do is measure mains voltage 230v and display a graph, thats it

My Pi will be in a remote location, using a USB 4G modem. I need a low cost solution,

Whats the easiest way to this.

After some research tonight I see one solution is to use a PZEM-004T and esp8266, how would this connect, what do I need to do? Cant I just use the serial on the Pi?

Any help would be really appreciated.

[waltervl]

See this topic and especially the last post with the mentioned plugin viewtopic.php?p=310288#p310288

[mrfunk]

thanks