LCD status

• Porteur du projet : Ap
• Fichiers utiles : mettre un lien vers un code ou un fichier

Il s'agit simplement d'un afficheur LCD branché sur un esp. Un formulaire en php, logé sur un ftp. permet de mettre a jour le texte affiché.

Ainsi avec son telephone sur internet on peut mettre a jour l'ecran à distance.

• Notez ici les références artistiques et techniques, ou autres influences

Liste de matériel et composants nécessaires (documents avec photo si possible…)

<code c+> #include <WiFi.h> #include <HTTPClient.h> #include <Wire.h>

——————————————————- WiFi credentials ——————————————————- const char* ssid = “ESDAMM-Pedagogie”; const char* password = “P3daGog!e”; ——————————————————- Grove RGB LCD I2C addresses ——————————————————- #define LCD_TEXT_ADDR 0x3E #define LCD_RGB_ADDR 0x62

ESP32 I2C pins #define SDA_PIN 21 #define SCL_PIN 22 ——————————————————- LCD low-level functions ——————————————————- void lcdSendCommand(uint8_t cmd) {

Wire.beginTransmission(LCD_TEXT_ADDR);
Wire.write(0x80);
Wire.write(cmd);
Wire.endTransmission();

}

void lcdSendData(uint8_t data) {

Wire.beginTransmission(LCD_TEXT_ADDR);
Wire.write(0x40);
Wire.write(data);
Wire.endTransmission();

}

void i2cWriteRegister(uint8_t addr, uint8_t reg, uint8_t val) {

Wire.beginTransmission(addr);
Wire.write(reg);
Wire.write(val);
Wire.endTransmission();

}

void setRGB(uint8_t r, uint8_t g, uint8_t b) {

i2cWriteRegister(LCD_RGB_ADDR, 0x04, r);
i2cWriteRegister(LCD_RGB_ADDR, 0x03, g);
i2cWriteRegister(LCD_RGB_ADDR, 0x02, b);

}

void lcdSetCursor(uint8_t col, uint8_t row) {

uint8_t pos = (row == 0) ? 0x00 : 0x40;
lcdSendCommand(0x80 | (pos + col));

}

void lcdInit() {

lcdSendCommand(0x38);
lcdSendCommand(0x39);
lcdSendCommand(0x14);
lcdSendCommand(0x70);
lcdSendCommand(0x56);
lcdSendCommand(0x6C);
delay(200);
lcdSendCommand(0x38);
lcdSendCommand(0x0C);
lcdSendCommand(0x01);
lcdSendCommand(0x06);

// Init RGB
i2cWriteRegister(LCD_RGB_ADDR, 0x00, 0x00);
i2cWriteRegister(LCD_RGB_ADDR, 0x01, 0x00);
i2cWriteRegister(LCD_RGB_ADDR, 0x08, 0xAA);

setRGB(255, 255, 255);

}

void lcdPrint(const String &msg) {

lcdSendCommand(0x01);  // clear
delay(2);

uint8_t col = 0, row = 0;
lcdSetCursor(0, 0);

for (int i = 0; i < msg.length(); i++) {
  if (msg[i] == '\n') {
    row = 1;
    col = 0;
    lcdSetCursor(col, row);
    continue;
  }
  lcdSendData(msg[i]);
  col++;
  if (col >= 16) {
    if (row == 0) {
      row = 1;
      col = 0;
      lcdSetCursor(col, row);
    } else {
      break;
    }
  }
}

}

——————————————————- WiFi + HTTP ——————————————————- String downloadText() { HTTPClient http; http.begin(“https://wikibam.com/XP/fichier.txt”); int code = http.GET(); if (code != 200) { Serial.println(“Erreur HTTP : ” + String(code)); http.end(); return “HTTP error”; } String payload = http.getString(); http.end(); return payload; } ——————————————————- void setup() {

Serial.begin(115200);
delay(200);

Wire.begin(SDA_PIN, SCL_PIN);
lcdInit();
setRGB(0, 150, 255);

lcdPrint("Connexion\nWiFi...");
Serial.println("Connexion WiFi...");

WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
  delay(300);
  Serial.print(".");
}
Serial.println("\nWiFi OK !");
lcdPrint("WiFi OK!\nLecture...");

}

——————————————————- void loop() { if (WiFi.status() == WL_CONNECTED) { String txt = downloadText(); Serial.println(“Mis à jour:”); Serial.println(txt); lcdPrint(txt); } else { lcdPrint(“WiFi perdu!\nReconnexion”); WiFi.begin(ssid, password); } delay(5000); «< mise à jour toutes les 5 secondes }

<code>

Code pour afficher les images du projet :