u8g2 and screen oled i2c 128x64 (screen empty) and 128x128 soon #644

Freepl · 2018-06-27T09:41:25Z

Hello

I have this screen
https://fr.aliexpress.com/item/Free-shipping-Yellow-blue-double-color-128X64-OLED-LCD-LED-Display-Module-For-Arduino-0-96/32665937977.html?spm=a2g0s.9042311.0.0.X7TUdD
I connect my screen like this
VCC / 5v
GND / GND
SCL / A5
SDA / A4

I'll receveid this screen too soon
https://fr.aliexpress.com/item/Free-shipping-Yellow-blue-double-color-128X64-OLED-LCD-LED-Display-Module-For-Arduino-0-96/32665937977.html?spm=a2g0s.9042311.0.0.X7TUdD

I have this code. It compile but there is nothing on screen.
can you see this and say modify this for the 2 screens ?

It has been one week since I look
Thank you

My code don't work ( screen empty)
`// Pour l'écran
#include <Arduino.h>
#include <U8g2lib.h>
//Pour les sondes
#include <DallasTemperature.h> //DS18B20 pour température de l'eau et de l'air
#include <Wire.h>

//les librairies de l'écran
// pour les fontes https://github.com/olikraus/u8g2/wiki/fntlistall
// poue l'écran https://github.com/olikraus/u8g2/wiki/u8g2setupc

// Déclaratipon de l'écran 128x64
//U8G2_SSD1306_128X64_NONAME_2_SW_I2C u8g2(rotation, clock, data [, reset])
// U8G2_R0,SCL A5, SDA A4
U8G2_SSD1306_128X64_NONAME_2_SW_I2C u8g2 (U8G2_R0, A5, A4)

//Déclaration de l'écran 128x128
/*
U8G2_SSD1327_EA_W128128_1_SW_I2C u8g2(U8G2_R0, A5, A4);
ou le
U8G2_SSD1327_MIDAS_128X128_1_SW_I2C u8g2(U8G2_R0, A5, A4);
*/

// les 2 sondes DS18B20
#define ONE_WIRE_BUS_1 2 // sonde pour l'eau pin 2
#define ONE_WIRE_BUS_2 4 // sonde pour l'air pin 4
OneWire oneWire_in(ONE_WIRE_BUS_1); // sonde pour l'eau
OneWire oneWire_out(ONE_WIRE_BUS_2); // sonde pour l'air
DallasTemperature sensor_eau(&oneWire_in); // sonde pour l'eau
DallasTemperature sensor_air(&oneWire_out); // sonde pour l'air

void setup(void)
{
/* U8g2 Project: SSD1306 Test Board */
pinMode(A4, OUTPUT);
digitalWrite(A4, 0);
u8g2.begin();
u8g2.setPowerSave(0);

// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature Control Library Demo - TwoPin_DS18B20");

// Start up the library
sensor_eau.begin(); // sonde pour l'eau
sensor_air.begin(); // sonde pour l'air

// déclaration de la pin 2 et 4
pinMode(2, INPUT);
pinMode(4, INPUT);

int readValEau = analogRead(2);// met à zéro la sonde EAU
int readValAir = analogRead(4);// met à zéro la sonde AIR

}

void loop(void)
{
// AFFICHAGE SUR SERIAL
Serial.print("Recherche des temperatures...");
sensor_eau.requestTemperatures();
sensor_air.requestTemperatures();
Serial.println(" done");

// sonde EAU
Serial.print("Température eau: ");
Serial.println(sensor_eau.getTempCByIndex(0));

// sonde AIR
Serial.print("Température air: ");
Serial.println(sensor_air.getTempCByIndex(0));
delay ( 5000);

/*/modele d'écriture
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 15);
u8g2.print("Hello World!");
*/

// Affichage Niveau batterie
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 0);
u8g2.println("NIVEAU BATTERIE");
//delay ( 1000);

// pour le voltage de la batterie
// Conversion du signal (which goes from 0 - 1023) to a voltage (0 - (V):
int sensorValue = analogRead(A0);//******************************************************* A3 pour la voiture bateau
// écrit la valeur lue
float voltage = sensorValue * (5.0 / 1023.0);
u8g2.setCursor(0, 1);// position 0, sur la 1 ere ligne,
u8g2.print(" ");
u8g2.print(voltage);
u8g2.print("V");

//Affichage températures Air
u8g2.setFont(u8g2_font_chroma48medium8_r);
u8g2.setCursor(0, 3);
u8g2.println("TEMP. AIR ");
u8g2.print(" ");
u8g2.print(sensor_air.getTempCByIndex(0));
u8g2.print(" ");
u8g2.print("C");

// Affichage températures Eau
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 6);
u8g2.println("TEMP. EAU ");
u8g2.print(" ");
u8g2.print(sensor_eau.getTempCByIndex(0));
u8g2.print(" ");
u8g2.print("C");

}`

olikraus · 2018-06-27T11:41:51Z

All the u8g2 commands have to be encapsulated in a while loop:

void loop(void) {
  ...
  u8g2.firstPage();
  do {
    <your code>
  } while ( u8g2.nextPage() );
 ...
}

Freepl · 2018-06-27T12:22:51Z

Hello
I am tall beginning with arduino
1 What declaration of screen I have to take 128x64 and 128x128 ?
2 I change my code but i have error

Code error
`Arduino : 1.8.4 (Windows 7), Carte : "Arduino/Genuino Uno"
Ecran_u8G2_128x64_128x128:27: error: expected ',' or ';' before 'OneWire'
OneWire oneWire_in(ONE_WIRE_BUS_1); // sonde pour l'eau
^
Ecran_u8G2_128x64_128x128:29: error: 'oneWire_in' was not declared in this scope
DallasTemperature sensor_eau(&oneWire_in); // sonde pour l'eau
^
exit status 1
expected ',' or ';' before 'OneWire'

`

Here my code modify
`// Pour l'écran
#include <Arduino.h>
#include <U8g2lib.h>
//Pour les sondes
#include <DallasTemperature.h> //DS18B20 pour température de l'eau et de l'air
#include <Wire.h>

//les librairies de l'écran
// pour les fontes https://github.com/olikraus/u8g2/wiki/fntlistall
// poue l'écran https://github.com/olikraus/u8g2/wiki/u8g2setupc

// Déclaratipon de l'écran 128x64
U8G2_SSD1306_128X64_NONAME_2_SW_I2C u8g2 (U8G2_R0, A5, A4)

//Déclaration de l'écran 128x128
/*
U8G2_SSD1327_EA_W128128_1_SW_I2C u8g2(U8G2_R0, A5, A4);
ou le
U8G2_SSD1327_MIDAS_128X128_1_SW_I2C u8g2(U8G2_R0, A5, A4);
*/

// les 2 sondes DS18B20
#define ONE_WIRE_BUS_1 2 // sonde pour l'eau pin 2
#define ONE_WIRE_BUS_2 4 // sonde pour l'air pin 4
OneWire oneWire_in(ONE_WIRE_BUS_1); // sonde pour l'eau
OneWire oneWire_out(ONE_WIRE_BUS_2); // sonde pour l'air
DallasTemperature sensor_eau(&oneWire_in); // sonde pour l'eau
DallasTemperature sensor_air(&oneWire_out); // sonde pour l'air

void setup(void)
{
/* U8g2 Project: SSD1306 Test Board */
pinMode(A4, OUTPUT);
digitalWrite(A4, 0);
u8g2.begin();
u8g2.setPowerSave(0);

// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature Control Library Demo - TwoPin_DS18B20");

// Start up the library
sensor_eau.begin(); // sonde pour l'eau
sensor_air.begin(); // sonde pour l'air

// déclaration de la pin 2 et 4
pinMode(2, INPUT);
pinMode(4, INPUT);

int readValEau = analogRead(2);// met à zéro la sonde EAU
int readValAir = analogRead(4);// met à zéro la sonde AIR

}

void loop(void)
{
// AFFICHAGE SUR SERIAL
Serial.print("Recherche des temperatures...");
sensor_eau.requestTemperatures();
sensor_air.requestTemperatures();
Serial.println(" done");

// sonde EAU
Serial.print("Température eau: ");
Serial.println(sensor_eau.getTempCByIndex(0));

// sonde AIR
Serial.print("Température air: ");
Serial.println(sensor_air.getTempCByIndex(0));
delay ( 5000);

/*/modele d'écriture
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 15);
u8g2.print("Hello World!");
*/
u8g2.firstPage();
do {
// Affichage Niveau batterie
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 0);
u8g2.println("NIVEAU BATTERIE");
//delay ( 1000);

// pour le voltage de la batterie
// Conversion du signal (which goes from 0 - 1023) to a voltage (0 - (V):
int sensorValue = analogRead(A0);//******************************************************* A3 pour la voiture bateau
// écrit la valeur lue
float voltage = sensorValue * (5.0 / 1023.0);
u8g2.setCursor(0, 1);// position 0, sur la 1 ere ligne,
u8g2.print(" ");
u8g2.print(voltage);
u8g2.print("V");

//Affichage températures Air
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 3);
u8g2.println("TEMP. AIR ");
u8g2.print(" ");
u8g2.print(sensor_air.getTempCByIndex(0));
u8g2.print(" ");
u8g2.print("C");

// Affichage températures Eau
u8g2.setFont(u8g2_font_ncenB14_tr);
u8g2.setCursor(0, 6);
u8g2.println("TEMP. EAU ");
u8g2.print(" ");
u8g2.print(sensor_eau.getTempCByIndex(0));
u8g2.print(" ");
u8g2.print("C");
} while ( u8g2.nextPage() );

}`

Freepl · 2018-06-27T12:23:58Z

I made a false manipulation

I am going to be frank, I am a big absolute beginner with arduino.
The code which I test is a continuation (suite) to copy / to stick.

You could modify it cleanly because I do not understand the arduino language and for the choice of screens and for the coding a lot as such

EDIT : My error is modified
// Déclaratipon de l'écran 128x64 U8G2_SSD1306_128X64_NONAME_2_SW_I2C u8g2 (U8G2_R0, A5, A4);

olikraus · 2018-06-27T13:35:30Z

Actually it looks better.
Optimization: Move statements like int sensorValue = analogRead(A0); before the loop.

Is it working now? It not, then please test your hardware setup with one of the u8g2 examples, which are shipped with the u8g2 library.

Freepl · 2018-06-27T13:43:15Z

I try this this night
SCL / A5
SDA / A4

The code is like this ?
`void setup(void)
{
.....
}

int sensorValue = analogRead(A0); // A4 or A5 for me ?
void loop(void)
{
u8g2.firstPage();
do {`
....
}

olikraus · 2018-06-27T15:32:54Z

void loop(void)
{
int sensorValue;

sensorValue = analogRead(A0); 
u8g2.firstPage();
do {
....
} while ( u8g2.nextPage() );

Freepl · 2018-06-27T21:21:07Z

A GREAT thank you .

The code works.

Can you confirm the screen for oled 128 x 128 please .
I'l receveid it soon.
Are you ok with this choice ?

//Déclaration of screen 128x128 /* U8G2_SSD1327_EA_W128128_1_SW_I2C u8g2(U8G2_R0, A5, A4); ou le U8G2_SSD1327_MIDAS_128X128_1_SW_I2C u8g2(U8G2_R0, A5, A4); */

The good code
`// Pour l'écran
#include <Arduino.h>
#include <U8g2lib.h>
//Pour les sondes
#include <DallasTemperature.h> //DS18B20 pour température de l'eau et de l'air
#include <Wire.h>

//les librairies de l'écran
// pour les fontes https://github.com/olikraus/u8g2/wiki/fntlistall
// poue l'écran https://github.com/olikraus/u8g2/wiki/u8g2setupc

// Déclaratipon de l'écran 128x64
U8G2_SSD1306_128X64_NONAME_2_SW_I2C u8g2 (U8G2_R0, A5, A4);

//Déclaration de l'écran 128x128
/*
U8G2_SSD1327_EA_W128128_1_SW_I2C u8g2(U8G2_R0, A5, A4);
ou le
U8G2_SSD1327_MIDAS_128X128_1_SW_I2C u8g2(U8G2_R0, A5, A4);
*/

// les 2 sondes DS18B20
#define ONE_WIRE_BUS_1 2 // sonde pour l'eau pin 2
#define ONE_WIRE_BUS_2 4 // sonde pour l'air pin 4
OneWire oneWire_in(ONE_WIRE_BUS_1); // sonde pour l'eau
OneWire oneWire_out(ONE_WIRE_BUS_2); // sonde pour l'air
DallasTemperature sensor_eau(&oneWire_in); // sonde pour l'eau
DallasTemperature sensor_air(&oneWire_out); // sonde pour l'air

void setup(void)
{
/* U8g2 Project: SSD1306 Test Board */
pinMode(A4, OUTPUT);
digitalWrite(A4, 0);
u8g2.begin();
u8g2.setPowerSave(0);

// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature Control Library Demo - TwoPin_DS18B20");

// Start up the library
sensor_eau.begin(); // sonde pour l'eau
sensor_air.begin(); // sonde pour l'air

// déclaration de la pin 2 et 4
pinMode(2, INPUT);
pinMode(4, INPUT);

int readValEau = analogRead(2);// met à zéro la sonde EAU
int readValAir = analogRead(4);// met à zéro la sonde AIR
}

void loop(void)
{

int sensorValue = analogRead(A0); //A0

u8g2.firstPage();
do {
// AFFICHAGE SUR SERIAL
Serial.print("Recherche des temperatures...");
sensor_eau.requestTemperatures();
sensor_air.requestTemperatures();
Serial.println(" done");

// sonde EAU
Serial.print("Température eau: ");
Serial.println(sensor_eau.getTempCByIndex(0));

// sonde AIR
Serial.print("Température air: ");
Serial.println(sensor_air.getTempCByIndex(0));
delay ( 500);


/*/modele d'écriture
  u8g2.setFont(u8g2_font_ncenB14_tr);
  u8g2.setCursor(0, 15);
  u8g2.print("Hello World!");
*/
/* fonte 8 pixels u8g2_font_t0_11_tf
   fonte 10 pixels  u8g2_font_7x14_mr X11
   fonte 12 pixels u8g2_font_9x15_mn X11
   fonte 14 pixels u8g2_font_t0_18_mn UW ttyp0
    fonte 16 pixels u8g2_font_crox3c_tn crox
  fonte 20 pixels u8g2_font_fur20_tf Free Universal

*/


// Affichage Niveau batterie
u8g2.setFont(u8g2_font_t0_11_tf);///(u8g2_font_ncenB14_tr)
u8g2.setCursor(0, 8);
u8g2.println("NIVEAU BATTERIE");
//delay ( 1000);

// pour le voltage de la batterie
// Conversion du signal (which goes from 0 - 1023) to a voltage (0 - (V):
int sensorValue = analogRead(A0);//*******************************************************  A3 pour la voiture bateau
// écrit la valeur lue
float voltage = sensorValue * (5.0 / 1023.0);
u8g2.setCursor(0, 24);// position 0, sur la 1 ere ligne,
u8g2.print(voltage);
u8g2.print("V");

//Affichage  températures Air
u8g2.setFont(u8g2_font_t0_11_tf);
u8g2.setCursor(0, 44);
u8g2.println("TEMP. AIR ");
u8g2.print("  ");
u8g2.print(sensor_air.getTempCByIndex(0));
u8g2.print(" ");
u8g2.print("C");

// Affichage  températures Eau
u8g2.setFont(u8g2_font_t0_11_tf);
u8g2.setCursor(0, 64);
u8g2.println("TEMP. EAU ");
u8g2.print("  ");
u8g2.print(sensor_eau.getTempCByIndex(0));
u8g2.print(" ");
u8g2.print("C");

} while ( u8g2.nextPage() );

}`

olikraus · 2018-06-27T22:26:12Z

The W128128 is still under construction. The Midas variant should be ok.

Freepl · 2018-06-28T04:10:46Z

Bonjour olikraus, thank you for all Patrick Lacroix, patrick.lacroix18@free.fr 28/06/2018 ----- Message reçu ----- De : olikraus À : olikraus/u8g2 Date : 2018-06-28, 00:26:15 Sujet : Re: [olikraus/u8g2] u8g2 and screen oled i2c 128x64 (screen empty)and 128x128 soon (#644) The W128128 is still under construction. The Midas variant should be ok. � You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub, or mute the thread.

Freepl · 2018-06-28T06:16:28Z

Hello
Question 1
Which code is good ?
(This code works)
void loop(void) { int sensorValue = analogRead(A0); //A0 u8g2.firstPage(); do {

or this code
void loop(void) { int sensorValue; sensorValue = analogRead(A0); u8g2.firstPage(); do {
Which is better ?

Question 2
I use int sensorValue = analogRead(A0) for this

// pour le voltage de la batterie // Conversion du signal (which goes from 0 - 1023) to a voltage (0 - (V): int sensorValue = analogRead(A0);//******************************************************* A3 pour la voiture bateau // écrit la valeur lue float voltage = sensorValue * (5.0 / 1023.0); u8g2.setCursor(0, 24);// position 0, sur la 1 ere ligne, u8g2.print(voltage); u8g2.print("V");

You says me use too
int sensorValue; sensorValue = analogRead(A0);
Goes it not to have there a problem?
Should not write sensorValue = analogRead ( A4); ?

olikraus · 2018-06-28T08:00:39Z

Question 1: Both forms should be the same. There is no difference.

Question 2:
Not clear what you mean? Is it about A0 and A4? I can not tell this, you should know this better.

In general: You should NOT use any analogRead(...) inside the u8g2.NextPage() while loop.
So both of your analogReads should happen outside.

Freepl · 2018-06-28T08:11:35Z

Question 2:
Not clear what you mean?

my origin code is for print on screen the level of battery.
This code use
int sensorValue = analogRead(A0);
here

`......
void loop(void)
{
int sensorValue = analogRead(A0); //  Your code
u8g2.firstPage();
do { 
.........
// pour le voltage de la batterie
// Conversion du signal (which goes from 0 - 1023) to a voltage (0 - (V):
int sensorValue = analogRead(A0);//*****My code for print level battery***
// écrit la valeur lue
float voltage = sensorValue * (5.0 / 1023.0);
u8g2.setCursor(0, 24);// position 0, sur la 1 ere ligne,
u8g2.print(voltage);
u8g2.print("V");

and says me use this too befor my code.
I would know if this make one problem and I asked you if I should not mark A4 in your analogRead instead of A0?

olikraus · 2018-06-28T09:13:01Z

As I said, there should be no analogRead(..) inside the u8g2-do-while loop at all.

Freepl · 2018-06-28T09:21:44Z

And then where I do have to put this code?

`// pour le voltage de la batterie
// Conversion du signal (which goes from 0 - 1023) to a voltage (0 - (V):
int sensorValue = analogRead(A0);//*******************************************************  A3 pour la voiture bateau
// écrit la valeur lue
float voltage = sensorValue * (5.0 / 1023.0);
u8g2.setCursor(0, 24);// position 0, sur la 1 ere ligne,
u8g2.print(voltage);
u8g2.print("V");

olikraus · 2018-06-28T09:45:57Z

Outside the u8g2-do-while loop

olikraus · 2018-08-04T09:19:48Z

... I think this can be closed...

Freepl closed this as completed Jun 27, 2018

Freepl reopened this Jun 27, 2018

olikraus closed this as completed Aug 4, 2018

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u8g2 and screen oled i2c 128x64 (screen empty) and 128x128 soon #644

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u8g2 and screen oled i2c 128x64 (screen empty) and 128x128 soon #644

u8g2 and screen oled i2c 128x64 (screen empty) and 128x128 soon #644

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