Getting gray question marks on serial monitor

Question

I am trying to use an arduino uno to check to see if an esp8266-015 wifi module is working using AT commands. Connections ESP8266 Arduino Rx-Rx Tx-Tx GND-GND EN-3.3v VDD-3.3

I selected arduino uno in my board manager and the correct port this code is just a setup and loop

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

But when I type AT into the serial monitor, nothing happens, All I see is the serial monitor spitting this. image

I have looked through several tutorials and I keep getting this error, it just keeps printing the gray question marks. This is my first time using an esp8266 wifi module.

Arduino TX -> ESP8266 RX, Arduino RX <- ESP8266 TX. You need to connect the sender to receiver, not RX - RX, TX - TX. — hcheung
– hcheung, Commented Nov 15, 2022 at 0:28
@hcheung, the esp8266 communicates with the USB chip of Uno, not with the ATmega — Juraj
– Juraj, Commented Nov 15, 2022 at 6:47

Tyler2P · Accepted Answer · 2023-03-11 13:33:36Z

0

You need to start the serial monitor first in your code, otherwise it won't be readable. Putting:

Serial.begin(115200);

Within the setup loop should allow this to be readable, but you can also add extra processing as shown at this link: https://www.instructables.com/Get-Started-With-ESP8266-Using-AT-Commands-Via-Ard/

edited Mar 11, 2023 at 13:33

Tyler2P

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answered Mar 2, 2023 at 13:31

Breadcrumbbz

1

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