ESP8266 Community Forum

Posted: **Mon Dec 07, 2015 10:37 pm**

Hello everyone! I have a Pro Trinket 3V hooked up to a ESP8266 but am having trouble getting anything to work on the wifi side of things. Here's how I have the two connected:

(Trinket -> ESP8266)
3V -> 3V and CHPD
GND -> GND
RX -> TX
TX -> RX

And my code. I'm using blinks to tell me success or fail. I get 3 blinks that tell me Trinket starts up, 5 blinks when resetModule() runs successfully, and 6 blinks when connectWiFi() supposedly runs successfully. However, when I run my connectService() function I get fast 7 blinks meaning failed.

Here's the code:

Code: Select all

#define SSID "..." // your wifi ssid here
#define PASS "..." // your wifi wep key here

void setup() {
  pinMode( 3, OUTPUT );
  pinMode( 13, OUTPUT );
  blinker( 3, 250 ); // blink led13 to indicate power up

  digitalWrite( 3, HIGH );
  Serial.begin( 115200 ); // 115200 max
  Serial.setTimeout( 5000 );
  delay( 250 );

  // Attempt to reset the module
  while( !resetModule() );

  // Connect to Wifi.
  while( !connectWiFi() );
}

void loop() {
  // function to check server for data
  connectService( "google.com", 80 );

  delay( 10000 );
}


boolean resetModule() {
  // test if the wifi module is ready
  Serial.println("AT+RST");

  while( !Serial.available() ) {}

  if( Serial.find("ready") ) {
    blinker( 5, 250 );
    delay( 1000 );

    return true;
  } else {
    blinker( 5, 100 );
    digitalWrite( 3, LOW );
    delay( 500 );

    digitalWrite( 3, HIGH );
    delay( 500 );

    return false;
  }  
}

boolean connectWiFi() {
  Serial.println( "AT+CWMODE=1" );
  String cmd="AT+CWJAP=\"";
  cmd+=SSID;
  cmd+="\",\"";
  cmd+=PASS;
  cmd+="\"";
  Serial.println(cmd);

  while( !Serial.available() ) {}

  if( Serial.find("OK") ) {
    blinker( 6, 250 );
    delay( 2500 );

    // set the single connection mode
    Serial.println( "AT+CIPMUX=0" );

    while( !Serial.available() ) {}

    if( Serial.find( "OK" ) ) {
      return true;
    } else {
      return false;
    }
  } else {
    blinker( 6, 100 );
    delay( 1000 );

    return false;
  }
}

boolean connectService( String service, int port ) {  
  String serviceConnect = "AT+CIPSTART=\"TCP\",\"" + service + "\"," + port;
  Serial.println( serviceConnect );
 
  while( !Serial.available() ) {}
  delay(300);

  if( Serial.find( "Linked" ) ) {
    blinker( 7, 250 );

    return true;
  } else {
    blinker( 7, 100 );
    delay( 1000 );

    return false;  
  }
}

void blinker( int repeat, int speed ) {
  for( int i=0; i<repeat; i++ ) {
    digitalWrite( 13, HIGH );
    delay( 100 );
    digitalWrite( 13, LOW );
    delay( speed );
  }
}

My hunch is that I'm not actually connected to wifi since I can't see the device connected to my network via my router's web tool. I also couldn't see the ESP8266 wifi network I setup when testing it out as an access point. I tried 9600 baud but then can't get past the resetModule() function.

Thanks so much everyone!

~ Kevin

ESP8266 Community Forum

Pro Trinket 3V, ESP8266 Problem

Pro Trinket 3V, ESP8266 Problem