ESP8266 Community Forum

Hello. I want to connect the TX pin of one ESP32 to the RX pins of three ESP8266. it works with two rx pins but not with three because the internal pullup of the rx pins in parallel causes the esp32 to fail to set the zero volt potential correctly. I try to deactivate the pullup of two rx pins on the three to avoid this. I don't know how to do this with arduino ide. can you help me please. sorry for my bad english, I'm french
Best regards.

"TTL" serial doesn't use pullups. Deactivate all of them, both internal and external.