Hi everyone, Recently, I tried to setup a new test for a beginner like me by connect and upload the code to ESP8266 -01 like people show me: #include <ESP8266WiFi.h> const char* ssid = "YOUR_SSID";//type your ssid const char* password = "YOUR_PASSWORD";//type your password int ledPin = 2; // G…

Programing code failure or wrong GPIO pin?

nhatminh1209 May 22, 2018, 1:39pm 6

westfw:
Do you have a common ground connection between the relay board and the esp board?

what will happen if the relay and esp have the same Ground connection pin?

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