During WifiManager display on the attached OLED

Projects General Guidance
1

I’m running WifiManager(tzapu) OnDemand on ESP8266

The OnDemand works perfect.

I need to be able during the waiting for OnDemand button to display a message on the attached OLED.

Can someone guide me please?

Here is the sketch:

/**
 * OnDemandConfigPortal.ino
 * example of running the configPortal AP manually, independantly from the captiveportal
 * trigger pin will start a configPortal AP for 120 seconds then turn it off.
 * 
 */
#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128  // OLED display width, in pixels
#define SCREEN_HEIGHT 32  // OLED display height, in pixels
#define OLED_RESET -1  // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


// select which pin will trigger the configuration portal when set to LOW
#define TRIGGER_PIN 0

int timeout = 120; // seconds to run for

void setup() {
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("\n Starting");
  pinMode(TRIGGER_PIN, INPUT_PULLUP);
}

// Here, waiting for the OnDemand button I would like to display on the attahed OLED the message "Press connect button"


void loop() {
  // is configuration portal requested?




  if ( digitalRead(TRIGGER_PIN) == LOW) {
    WiFiManager wm;    

    //reset settings - for testing
    wm.resetSettings();
   
    // set configportal timeout
    wm.setConfigPortalTimeout(timeout);

    if (!wm.startConfigPortal("OnDemandAP")) {
      Serial.println("failed to connect and hit timeout");
      delay(3000);
      //reset and try again, or maybe put it to deep sleep
      ESP.restart();
      delay(5000);
    }

    //if you get here you have connected to the WiFi
    Serial.println("connected...yeey :)");

  }

  // put your main code here, to run repeatedly:
}
2

why don't you write it at the end of the setup ?

3

There is at the end of setup, it does not work, it loops for ever.

This is what I need to run :

display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.print("Press connect button");
display.display();

4

you need to call begin() as well to initialize the display instance.

see the examples

5

I followed your advice, nothing works, now, random white and black pixels.

This is the added part to the existing sketch:

void setup() {
   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Start WIFI config");
  display.display();

  
  }
7

Try SCREEN_ADDRESS 0x3D

8

Get the screen to work without any WiFi stuff first. Use the examples, read the library ‘s doc to use the right address and use the right pins to connect to it.

Until an example works there is no point going further in your application.

9

Yes the display address is 3C, and yes the display is working. I tested it on different sketch, just display using the same sequence of line code as here.

10

Verify correct I2C pins

11

As long as the display test worked, they are correct.

12

If that is literally what you added, then all of that code falls within the if statement, and nothing past the for(;;); will ever execute.

13

this is the current version of the sketch, that I’m waiting to compile (IDE compile is very slow for me):

/**
 * OnDemandConfigPortal.ino
 * example of running the configPortal AP manually, independantly from the captiveportal
 * trigger pin will start a configPortal AP for 120 seconds then turn it off.
 * 
 */
#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128  // OLED display width, in pixels
#define SCREEN_HEIGHT 32  // OLED display height, in pixels
#define OLED_RESET -1  // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


// select which pin will trigger the configuration portal when set to LOW
#define TRIGGER_PIN 0

int timeout = 120; // seconds to run for

void setup() {

  
  
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("\n Starting");
  pinMode(TRIGGER_PIN, INPUT_PULLUP);

  //showoled();

  


}

// Here, waiting for the OnDemand button I would like to display on the attahed OLED the message "Press connect button"


void loop() {
  // is configuration portal requested?





  if ( digitalRead(TRIGGER_PIN) == LOW) {
    WiFiManager wm;    
  showoled();
    //reset settings - for testing
    wm.resetSettings();
   
    // set configportal timeout
    wm.setConfigPortalTimeout(timeout);

    if (!wm.startConfigPortal("OnDemandAP")) {
      Serial.println("failed to connect and hit timeout");
      delay(3000);
      //reset and try again, or maybe put it to deep sleep
      ESP.restart();
      delay(5000);
    }

    //if you get here you have connected to the WiFi
    Serial.println("connected...yeey :)");
    Serial.println("starting OLED ");
    //delay(5000);
 


  }
}
void showoled(){
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Push config button");
  display.display();
}
14

Why did you say "nothing works" three times?

15

Because that times nothing was working, not eve the WifiManager OnDemand.

I still fight some problems, describing them soon, as my IDE compile is very slow.

Coming back soon with the last sketch version and problems.

16

As @J-M-L pointed out, you are missing display.begin(), but I was pointing out that the code in your post #5 is missing the ending '}' for the if statement.

17

This is the latest sketch version.

I created a function called showoled. The commands sequence in this function are working on another sketch.

My problem, now, is where to call the function before the line that is tested for the OnDemand button.

/**
 * OnDemandConfigPortal.ino
 * example of running the configPortal AP manually, independantly from the captiveportal
 * trigger pin will start a configPortal AP for 120 seconds then turn it off.
 * 
 */
#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128  // OLED display width, in pixels
#define SCREEN_HEIGHT 32  // OLED display height, in pixels
#define OLED_RESET -1  // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


// select which pin will trigger the configuration portal when set to LOW
#define TRIGGER_PIN 0

int timeout = 120; // seconds to run for

void setup() {

  
  
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("\n Starting");
  pinMode(TRIGGER_PIN, INPUT_PULLUP);

  //showoled();

  


}

// Here, waiting for the OnDemand button I would like to display on the attahed OLED the message "Press connect button"


void loop() {
  // is configuration portal requested?


/**
 * OnDemandConfigPortal.ino
 * example of running the configPortal AP manually, independantly from the captiveportal
 * trigger pin will start a configPortal AP for 120 seconds then turn it off.
 * 
 */
#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128  // OLED display width, in pixels
#define SCREEN_HEIGHT 32  // OLED display height, in pixels
#define OLED_RESET -1  // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


// select which pin will trigger the configuration portal when set to LOW
#define TRIGGER_PIN 0

int timeout = 120; // seconds to run for

void setup() {

  
  
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("\n Starting");
  pinMode(TRIGGER_PIN, INPUT_PULLUP);



}
// Here, waiting for the OnDemand button I would like to display on the attahed OLED the message "Press connect button"


void loop() {
  // is configuration portal requested?





  if ( digitalRead(TRIGGER_PIN) == LOW) {
    WiFiManager wm;    
  
    //reset settings - for testing
    wm.resetSettings();
   
    // set configportal timeout
    wm.setConfigPortalTimeout(timeout);

    if (!wm.startConfigPortal("OnDemandAP")) {
      Serial.println("failed to connect and hit timeout");
      delay(3000);
      //reset and try again, or maybe put it to deep sleep
      ESP.restart();
      delay(5000);
    }

    //if you get here you have connected to the WiFi
    Serial.println("connected...yeey :)");
    //Serial.println("starting OLED ");
    //delay(5000);
 


  }
}
void showoled() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Push config button");
  display.display();
}






  if ( digitalRead(TRIGGER_PIN) == LOW) {
    WiFiManager wm;    
  showoled();
    //reset settings - for testing
    wm.resetSettings();
   
    // set configportal timeout
    wm.setConfigPortalTimeout(timeout);

    if (!wm.startConfigPortal("OnDemandAP")) {
      Serial.println("failed to connect and hit timeout");
      delay(3000);
      //reset and try again, or maybe put it to deep sleep
      ESP.restart();
      delay(5000);
    }

    //if you get here you have connected to the WiFi
    Serial.println("connected...yeey :)");
    Serial.println("starting OLED ");
    //delay(5000);
 


  }
}
void showoled(){
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Push config button");
  display.display();
}
18

Doing the #include in the loop is a total nonsense…. Why two setup and loop ??

19

I think it is a copy paste error

20

Fix it…

21

working on it