Arduino Esp8266

Using Arduino IDE 1.x
1

OK. So i just bought the esp8266 wifi chip. I followed all the steps for setting it up with the Arduino UNO. The pins I connected were as follows:

ArduinoUNO ESP8266
3.3V-------------VCC
3.3V-------------CH_PD
RX---------------RX
TX---------------TX
GND-------------GND

As soon as i make these connections complete, the Arduino keeps on Rebooting. I opened the Windows Device Manager and it just keep on Resetting again and again.

Thus every time i went to start the serial monitor, it said "Port Not Found"

What could be the problem? It seems to work for others.!

Please help.

Thankyou

2

The UNO's RX and TX pins are 5V logic so you are applying too much to the ESP8266. You might have damaged one or both devices.

The ESP8266 also can take fairly large spikes of current which is too much for the very small 3.3V supply inside the UNO to cope with. This could cause the voltage to drop and the UNO to reset.

You will need logic level converters and a 3.3V supply for driving the ESP8266.

3

gblades:
The UNO's RX and TX pins are 5V logic so you are applying too much to the ESP8266. You might have damaged one or both devices.

The ESP8266 also can take fairly large spikes of current which is too much for the very small 3.3V supply inside the UNO to cope with. This could cause the voltage to drop and the UNO to reset.

You will need logic level converters and a 3.3V supply for driving the ESP8266.

+1

3.3V power supply just for the ESP8266

voltage divider for ESP8266 RX <--- Arduino TX

4

Logic level converter + 3V PSU are handy modules for developing stuff on a bread board.

5

My preference is for the FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Modules to program the ESP's
Or the CH340 variants do just as good a job too

They have more versatility with Arduinos as a whole.

6

Damn it!! Is there anyway to check if I have damaged the Esp8266? The red power led still glows when connected VCC to the esp8266. But how do I check if I have ruined the Esp8266 for the worst?

7

You could try the ESP blink program.

If it uploads and blinks according to what you set the blink rate that would verify the processor.

// power down ESP connect LED after removing program pin from GND
// for node mcu use nodemcu1.1 esp-12E 
// ensure esp cores are latest (now working)
// for 

int ledPin = 2;
void setup() {
  pinMode(ledPin, OUTPUT);
}
 
void loop() {
  digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                  // wait for a second
  digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
  delay(200);                  // wait for a second
}

After that you should be able to upload wifi scan sketch and that would check the wifi section.

You didnt say which esp btw and I used the sketch above on a node lau esp

8

I am using the AI ESP8266Ex

9

That sketch will also run on yours

10

@shantanu24 - cross-posting is a fast track to a forum timeout.

DO NOT CROSS-POST, CROSS-POSTING WASTES TIME.

11

Seems to me that RX should be connected to TX and TX to RX ?...

12

I'm sorry for the cross-posting. I guess in the fuss of trying different troubleshooting options and overall confusion, I must have re-posted the same issue.

My sincere Apologies.

13

alains:
Seems to me that RX should be connected to TX and TX to RX ?...

Not when he is using the Arduino as a USB-to-TTL converter.
Not the best of ideas, but he is doing it.

14

If the OP didn't get things working yet, maybe this thread will help (depending what you trying to achieve exactly and what exact module you're using)

https://forum.arduino.cc/index.php?topic=283043.30

15