Why not replace the 2nd Arduino with LCD with a nodeMCU or Wemos D1 mini? that way you have the LCD and WiFi on one device. I now have Arduino mini pro + 5110 lcd and a lot of level shifting resistors between them. That is a good idea to remove the current system and ESP8266 Nodemcu+5110 lcd. It do...

Hello I have a tank in earth about 1m. There is one arduino that measures water tank level. The Tank level info then travels by wire to basement to another arduino that has a screen. Now I would like to add there one ESP01 that would send the info to my mqtt server. Would two serial receivers be pos...