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  • What happens if you remove/comment out "Serial.begin(115200);"? Commented Nov 18, 2017 at 20:33
  • Please show your wiring schematic. Do you use pull-up resistors for RX and TX? Commented Nov 18, 2017 at 22:15
  • 2
    Also asked at: forum.arduino.cc/index.php?topic=512284 If you're going to do that then please be considerate enough to add links to the other places you cross posted. This will let us avoid wasting time due to duplicate effort and also help others who have the same questions and find your post to discover all the relevant information. Commented Nov 18, 2017 at 23:30
  • if i do not have serial monitor open loop function doesnt work. if I have serial monitor open the OLED updates, if i close serial monitor window the text on doest updates from the loop function. why is loop function dependent on serial monitor window being open ? Commented Nov 19, 2017 at 5:48
  • @MikaelPatel I have tried commenting that too didnt help, long time back I had similar issue and commented the serial.begin and it worked but with witty cloud dev board it didnt. Commented Nov 19, 2017 at 5:56