ESp32_DEVKIT_receiver_esp_now.ino

ESp32_DEVKIT_receiver_esp_now.ino

/*
  Florin Simedru
  Complete project details at https://automatic-house.blogspot.com
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

/********************************************************************************************************************
 *  Preferences--> Aditional boards Manager URLs : https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index.json
 *  Board Settings:
 *  Board: "ESP32 Wrover Module"
 *  Upload Speed: "921600"
 *  Flash Frequency: "80MHz"
 *  Flash Mode: "QIO"
 *  Partition Scheme: "Hue APP (3MB No OTA/1MB SPIFFS)"
 *  Core Debug Level: "None"
 *  COM Port: Depends *On Your System*
 *  
 */

 
#include <esp_now.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <SPI.h>

const char* ssid = "WIFI_SSID";
const char* password = "password";


// For the breakout, you can use any 2 or 3 pins
// These pins will also work for the 1.8" TFT shield
#define TFT_MOSI 23  // SDA Pin on ESP32
#define TFT_SCLK 18  // SCL Pin on ESP32
#define TFT_CS   5  // Chip select control pin
#define TFT_DC    2  // Data Command control pin
#define TFT_RST   4  // Reset pin (could connect to RST pin)

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 160 // OLED display height, in pixels
/* TFT ST7735 configuration */
Adafruit_ST7735 display = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);

String temperature;
String humidity;
String pressure;

unsigned long previousMillis = 0;
const long interval = 5000; 
// Structure example to receive data
// Must match the sender structure
typedef struct struct_message {
    char a[32];
    int b;
    float c;
    bool d;
} struct_message;

// Create a struct_message called myData
struct_message myData;
const char* ntpServer = "europe.pool.ntp.org";
const long  gmtOffset_sec = 3600;
const int   daylightOffset_sec = 3600;

/* Function to get timeinfo from ntpServer*/
void printLocalTime()
{
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time");
    return;
  }
  Serial.println(&timeinfo, "%A, %B %d %y %H:%M:%S");
  display.println(&timeinfo, "%a, %b %d %y %H:%M:%S");
}

// callback function that will be executed when data is received from ESP-NOW sender
void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Bytes received: ");
  Serial.println(len);
  Serial.print("Char: ");
  Serial.println(myData.a);
  Serial.print("Int: ");
  Serial.println(myData.b);
  Serial.print("Float: ");
  Serial.println(myData.c);
  Serial.print("Bool: ");
  Serial.println(myData.d);
  Serial.println();
}

void setup() {
  Serial.begin(115200);
  // Set device as a Wi-Fi Station and access point
  WiFi.mode(WIFI_AP_STA);
  Serial.println(WiFi.macAddress());
  
  Serial.print("Hello! ST7735 TFT Test");
  // Use this initializer if you're using a 1.8" TFT
  display.initR(INITR_GREENTAB);    // Init ST7735 display 128x160 pixel
  display.setRotation(3);
  display.fillScreen(ST77XX_BLACK);
  
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) { 
    delay(500);
    Serial.print(".");
    // Display connection status
    display.setTextSize(1);
    display.setTextColor(ST77XX_WHITE);
    display.setCursor(10,10);
    display.print("Connecting to ");
    display.print(ssid);
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  
  display.setTextSize(1);
  display.setCursor(10, 20);
  display.print("Connected to WiFi with IP:");
  display.print(WiFi.localIP());
      
  // Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    display.setTextSize(1);
    display.setCursor(10, 40);
    display.print("Error initializing ESP-NOW ");
    display.print("return"); 
    return;
  }

  // Once ESPNow is successfully Init, we will register for recv CB to
  // get recv packer info
  esp_now_register_recv_cb(OnDataRecv);
  //init and get the time
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();
  delay(2000);
}

void PrintInfoServer() {
  unsigned long currentMillis = millis();
  
  if(currentMillis - previousMillis >= interval) {
     // Check WiFi connection status
    if(WiFi.status()== WL_CONNECTED ){ 
      // copy data received from ESP-NOW 
      temperature = myData.b;
      humidity = myData.c;
      pressure = myData.d;
      Serial.println("Temperature: " + temperature + " *C - Humidity: " + humidity + " % - Pressure: " + pressure + " hPa");
      
      display.fillScreen(ST77XX_BLACK);
      
      // display temperature
      display.setTextSize(1);
      display.setTextColor(ST77XX_WHITE);
      display.setCursor(10,10);
      display.print("T: ");
      display.print(temperature);
      display.print(" ");
      display.setTextSize(1);
      display.write(248);
      display.setTextSize(1);
      display.print("C");
      
      // display humidity
      display.setTextSize(1);
      display.setCursor(10, 20);
      display.print("H: ");
      display.print(humidity);
      display.print(" %"); 
      
      // display pressure
      display.setTextSize(1);
      display.setCursor(10, 30);
      display.print("P:");
      display.print(pressure);
      display.setTextSize(1);
      display.setCursor(50, 30);
      display.print("hPa");

      // display wifi
      display.setTextSize(1);
      display.setTextColor(ST77XX_WHITE);
      display.setCursor(10,40);
      display.print("wifi: ");
      display.print(ssid);
      display.print(" ");
      
      display.setTextSize(1);
      display.setTextColor(ST77XX_GREEN);
      display.setCursor(10,50);
      printLocalTime();
    }
    else {
      Serial.println("WiFi Disconnected");
    }
  }
}
void loop() {
  display.invertDisplay(false);
  PrintInfoServer();
  delay(1000);
}