Looking for a help with ATMega 2560 + ESP8266 Board

Projects General Guidance
1

I bought a board from Ali Express - The board is like this

The board has a set of jumpers set to

0 1 2 3 4 5 6 7
ON ON ON ON OFF OFF OFF OFF

My simple script just reads/writes from the Arduino USB Serial and sends anything it receives to the ESP8266 and anything it receives from the ESP8266 it sends to the Arduino Serial USB.

Both are running at 115200 baud rate. I resend the command every 10 seconds to just request the list again.

// COMMANDS
// Serial Monitor - Make sure that Both NL + CR is the mode.
// AT+CWLAP = LIST Access Points

unsigned long lastMillis = 0;

void setup()
{
  Serial3.begin(115200);
  Serial.begin(115200);

  delay(1000);
  Serial3.println("AT+CWLAP");
}
void loop()
{
  if (millis() - lastMillis >= 10000)
  {
    lastMillis = millis();
    Serial3.println("AT+CWLAP");
  }

  while (Serial3.available())
  {
    Serial.write(Serial3.read());
  }

  while (Serial.available())
  {
    Serial3.write(Serial.read());
  }

}

The Output is like below - Why is the access points so all over the place, it sometimes shows none, sometimes a few, sometimes my local ones and sometimes not?

Is it my code or something else?

AT+CWLAP

OK
AT+CWLAP

ERROR
AT+CWLAP

+CWLAP:(4,"SPARK-ZY9PSZ",-90,"44:c3:46:d0:08:5a",4)

OK
AT+CWLAP

+CWLAP:(3,"vodafone7A4D",-49,"a4:71:74:07:7a:54",4)

OK
AT+CWLAP

+CWLAP:(4,"SPARK-ZY9PSZ",-82,"44:c3:46:d0:08:5a",4)
+CWLAP:(4,"CROWEAV",-71,"80:1f:02:3d:54:66",13)

OK
AT+CWLAP

+CWLAP:(4,"CROWEAV",-74,"80:1f:02:3d:54:66",13)

OK
AT+CWLAP

+CWLAP:(3,"vodafone7A4D",-60,"a4:71:74:07:7a:54",4)
+CWLAP:(4,"SPARK-ZY9PSZ",-81,"44:c3:46:d0:08:5a",4)

OK
AT+CWLAP

OK
AT+CWLAP

+CWLAP:(4,"SPARK-ZY9PSZ",-84,"44:c3:46:d0:08:5a",4)

OK
AT+CWLAP

OK

Just looking for ideas on why the list is so random instead of listing all known access points each time.

My local Access Point is vodafone7A4D but CROWEAV is also in my house the others are my neighbors.

Chris

2

@iisfaq, do not cross-post. Other thread removed.

3

now with one thread, we can talk. how is the esp powered?

4

The third parameter is RSSI. The problem may be in vodafone7A4D

5

It was not a cross post (same forum), and I accidentally hit refresh it it added the post again. And I can not remove it since I do not get a delete option.

6

Juraj:
now with one thread, we can talk. how is the esp powered?

Did you looked at the link to the board? I may not have made it clear in the original post that the board is an ATMEGA 2560 with an ESP8266 on the same board.

640×640 56.6 KB

So the power is from USB.

Chris

7

aarg:
The third parameter is RSSI. The problem may be in vodafone7A4D

vodafoe7A4D is my normal access point and it is in the garage which is below were I am sitting - so technically quite close - 10 feet, but under the floor. And there is probably that silver paper below the floor which may make the RSSI quite low.

My phone gives me -50 to -60 dbm for the same access point. I checked the values and it shows up as quite good.

But would this cause the lists to be sporadic? Why would the other stronger rssi networks not always show up either?

Chris

8

iisfaq:
And I can not remove it since I do not get a delete option.

Report to moderator is not particularly difficult to find nor is it particularly difficult to use. It certainly would have taken you less time than composing reply #4. And, it would have saved another member from wasting their time reporting your duplicate threads.

But, if you prefer wasting your peers' time then so be it.

9

iisfaq:
Did you looked at the link to the board? I may not have made it clear in the original post that the board is an ATMEGA 2560 with an ESP8266 on the same board.

sorry, my error. It is as interesting board.

One explanation of problem with searching for APs can be interference. In some thread was a case with a Nextion display causing interference for the esp8266.