ESP8266 Community Forum

Posted: **Sat Sep 26, 2015 4:35 pm**

Hi all,
I'm trying to program my ESP-01 using the arduino IDE. I'm trying to make a program makes the ESP-01 module a standalone access point... When my phone device connects with the correct WiFi password, the module would then toggle a GPIO pin on for 2 seconds, then off. When my phone disconnects, it should toggle the same GPIO pin on for 2 seconds, then toggle it off.
The circuit would just be a ESP-01, a power source, and a optocoupler/optoisolator connected to a GPIO pin.

I don't have the faintest clue how to code this. I've tried many iterations of my own adaptations of various example code, and I can't seem to get it to work.
I'm so lost by the code, so it would be more optimal if you just tell me what the code should be.

Posted: **Sat Oct 03, 2015 10:48 pm**

I have an AP example on my project page, it may be helpful:

https://www.hackster.io/rayburne

Assuming your WiFi device is the only device to connect, you can just get the number of attached stations, if over 0, then you have a connection. Sample calls:
http://www.esp8266.com/viewtopic.php?f=32&t=5669#p29838

Ray

Posted: **Sun Oct 04, 2015 12:21 pm**

Ok, this is my code so far, it's throwing tons of errors when I verify it:

Code: Select all


/* Create a WiFi access point */

#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>
#define WIFI_MODE_AP

/* Set these to your desired credentials. */
const char *ssid = "Proximity Trigger 1";
const char *password = "thereisnospoon";
//Reference as station counter as "devices"
unsigned char devices;

ESP8266WebServer server(80);

/* Just a little test message.  Go to http://192.168.4.1 in a web browser
 * connected to this access point to see it.
 */
void handleRoot() {
   

}

void setup() {
   delay(1000);
   Serial.begin(115200);
   Serial.println();
   Serial.print("Configuring access point...");
   /* You can remove the password parameter if you want the AP to be open. */
   WiFi.softAP(ssid, password);

   IPAddress myIP = WiFi.softAPIP();
   Serial.print("AP IP address: ");
   Serial.println(myIP);
   server.on("/", handleRoot);
   server.begin();
   
  pinMode(2, OUTPUT);
  digitalWrite(2, LOW);
   devices = wifi_softap_get_station_num();
 }

void loop() {
   if (devices)  >= 1;
     digitalWrite(2, HIGH);
      delay(1000);
      digitalWrite(2,LOW);
  
   else if (devices)  <= 1;
     digitalWrite(2,HIGH);
     delay(1000);
     digitalWrite(2,LOW);   
  
   server.handleClient();
}
}

And these are the errors I'm getting:

"Arduino: 1.6.5 (Windows 7), Board: "Generic ESP8266 Module, Serial, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS)"

Proximity_Toggle_10_4_2015.ino: In function 'void setup()':
Proximity_Toggle_10_4_2015:41: error: 'wifi_softap_get_station_num' was not declared in this scope
Proximity_Toggle_10_4_2015.ino: In function 'void loop()':
Proximity_Toggle_10_4_2015:45: error: expected primary-expression before '>=' token
Proximity_Toggle_10_4_2015:50: error: 'else' without a previous 'if'
Proximity_Toggle_10_4_2015:50: error: expected primary-expression before '<=' token
Proximity_Toggle_10_4_2015.ino: At global scope:
Proximity_Toggle_10_4_2015:57: error: expected declaration before '}' token
'wifi_softap_get_station_num' was not declared in this scope

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences."

I still needs some tips please.

Posted: **Sun Oct 04, 2015 12:56 pm**

For the "error: 'wifi_softap_get_station_num'", you need to add an include :

Code: Select all

extern "C" {
#include "user_interface.h"
}

For the others, you have wrong C/C++ syntax ...

Code: Select all

if (devices  >= 1) {
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2,LOW);
}

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