Weather station with webserver, esp32 and e-paper screen

In this tutorial we will see how to make a weather station with esp32 and electronic ink display. We will analyze the source code, as well as see the connections of the electronic components, finally test the project with its operation. The printed circuit board is included completely free of charge.

You may be interested in projects in Arduino, pic, robotics, telecommunications, subscribe http://www.youtube.com/user/carlosvolt?sub_confirmation=1 videos with full source code and diagrams

Circuit

FEATURES of the ESP32-T module

Connectivity

The ESP32 module has all the wiFi variants:

802.11 b/g/n/e/i/n
Wi-Fi Direct (P2P), P2P Discovery, P2P Group Owner mode and P2P Power Management

This new version includes low-power Bluethoot connectivity

Bluetooth v4.2 BR/EDR and BLE
BLE Beacon

In addition, you can communicate using SPI, I2C, UART, MAC Ethernet, Host SD protocols

Microcontroller features

The CPU consists of a Tensilica LX6 Model SoC with the following features and memory

Dual 32-bit core with 160MHz speed
448 kBytes ROM
520kByteS SRAM

Have 48 Pins

18 12-bit ADC
2 8-bit DAC
10 pin contact sensors
16 PWM
20 Digital inputs/outputs

Power and consumption modes

For proper operation of the ESP32 it is necessary to supply a voltage between 2.8V and 3.6V. The energy you consume depends on the mode of operation. It contains a mode, the Ultra Low Power Solution (ULP),in which basic tasks (ADC, PSTN…) continue to be performed in Sleep mode.

TEMPERATURE and Humidity Sensor DHT11

This module consists of a DHT11 digital humidity and temperature sensor and a resistance of 1 ko. The DHT11 uses an internal thermistor and capacitive humidity sensor to determine environmental conditions, an internal chip is responsible for converting readings to a serial digital signal.

Operating voltage	3.3V to 5.5V
Humidity measurement range	20% to 90% RH
Humidity measurement accuracy	± 5% RH
Moisture measurement resolution	1% RH
Temperature measuring range	0oC to 50oC [32oF to 122oF]
Temperature measurement accuracy	± 2oC
Temperature measurement resolution	1oC
Signal transmission range	20m

Electronic ink display 4.3 Inch E-Paper 800×600

Overview

This is a serial interface E-Ink display module, 4.3 inches, 800 × 600 resolution, with built-in font libraries, ultra-low power consumption.

You don’t have to know anything about e-Paper’s complex underlying details, or the specific algorithms for displaying graphics, texts, and images. All you need is the serial interface, and all that matters is your creativity.

Features

Easy to use, it displays any content through a serial interface, including geometric graphics, texts and images
Embedded font libraries, supports Chinese 32-point, 48-point, and 64-dot GBK fonts and English fonts
The built-in 128MB NandFlash allows source/image data to be stored on an external TF card or on the internal NandFlash
4-level gray display, resolution 800 × 600
Adjustable serial interface baud rate, 115200 by default when turned on
Powered from 3.3V to 5V, compatible with logical level.
Ultra-low power consumption, resting current less than 5 mA
Comes with host computer software, control it directly on your computer

Applications

eBook
POS Shopping Center
Price tag
Industry instrument

Pin Definitions

VCC: 3.3V x 5.5V
GND: GND
DOUT: serial data output
DIN: serial data in
WAKE_UP: external alarm clock
RST: external reset

Learn more about this screen in http://rogerbit.com/wprb/2019/01/tutorial-pantalla-de-tinta-electronica-de-4-3-pulgadas-por-dfrobot/

Source

// Canal de youtube http://www.youtube.com/user/carlosvolt?sub_confirmation=1
//Tik-Tok https://www.tiktok.com/@carlosvolt
//https://www.instagram.com/carlosvolt_electronic_robotic
#include <WiFi.h> 
#include <Wire.h>
#include <NTPClient.h>
#include "DHT.h"
#include <epd.h>//Librería para el control del display
// Descomenta le linea dependiendo del sensor que vallas a usar
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT21 // DHT 21 
//#define DHTTYPE DHT22 // DHT 22
#define DHTPin 23 //PIin del sensor DHT;
DHT dht(DHTPin, DHTTYPE); 
float t;
float h;
char temp[32];
char hume[32];
String ip;
String hora;
const void * dir_ip;
const void * horaUTC;
int periodo = 10000;
unsigned long Tiempo = 0;
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);
const char* ssid = "Tu_red_Wifi"; 
const char* password = "Tu_Clave_Wifi";
WiFiServer server(80);
void setup() {
Serial.begin(115200);
dht.begin();//Inicializar el sensor DHT
Serial.print("Conectando a la red WiFi");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("Conectado con éxito a la red WiFi.");
Serial.println("La dirección IP es: ");
Serial.println(WiFi.localIP());
server.begin();
Serial.println("Servidor iniciado");
timeClient.begin();//Inicializa servidor NTP
//Inicializamos el el display
  epd_init();
  epd_wakeup();
  epd_set_memory(MEM_NAND);
  delay(2000);
}
void loop()
{
  timeClient.update();//Obtenemos la hora actulizada 
  h = dht.readHumidity();//Lectura de la humedad
  t = dht.readTemperature();//Lectura de la temperatura
  //Adactamos los datos de temperatura y humedad, direción ip y hora UTC para mostrarlo en el display
dtostrf(t, 8, 2, temp);
dtostrf(h, 8, 2, hume);
ip = String() + WiFi.localIP()[0] + "." + WiFi.localIP()[1] + "." + WiFi.localIP()[2] + "." + WiFi.localIP()[3];
hora = timeClient.getFormattedTime();
dir_ip = ip.c_str();
horaUTC = hora.c_str();
//////Se cumple esta condición cada 10 segundos
if(millis() > Tiempo + periodo){
Tiempo = millis(); 
textoDisplay();//Llamamos a la función para mostrar datos en el display 
  }
WiFiClient client = server.available();
if (client)//Si se cumple la condición, mostramos dotos en el webserver
{ 
Serial.println("Cliente web conectado ");
String request = client.readStringUntil('\r'); 
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
client.println("</style></head><body><h1>Servidor Web con esp32 y display E-Paper</h1>");
client.println("<h2>Tipo de sensor DHT11</h2>");
client.println("<h2>www.rogerbit.com</h2>");
client.println("<table><tr><th>Valores Leidos</th><th>VALUE</th></tr>");
client.println("<tr><td>Temp. Celsius</td><td><span class=\"sensor\">");
client.println(t);
client.println(" *C</span></td></tr>"); 
client.println("<tr><td>Humedad</td><td><span class=\"sensor\">");
client.println(h);
client.println(" %</span></td></tr>"); 
client.println("<tr><td>Ultima actualizacion Hora UTC</td><td><span class=\"sensor\">");
client.println(hora);
client.println("</span></td></tr>"); 
client.println("</body></html>"); 
client.stop();
client.println();
Serial.println("Client disconnected.");
Serial.println("");
}
}
void textoDisplay(void)
{
  ////Estación meteorológica
  epd_set_ch_font(GBK64);
  epd_set_en_font(ASCII64);
  epd_disp_string("ESTACION-METEOROLAGICA", 0, 10);
  ////Temperatura
  epd_set_ch_font(GBK64);
  epd_set_en_font(ASCII64);
  epd_disp_string("Temperatura: ", 0, 80);
  epd_disp_string(temp, 350, 80);
  epd_disp_string("Grados C", 510, 80);
  ////Humedad
  epd_set_ch_font(GBK64);
  epd_set_en_font(ASCII64);
  epd_disp_string("Humedad: ", 0, 150);
  epd_disp_string(hume, 350, 150);
  epd_disp_string("Porciento", 510, 150);
  ////Hora UTC
  epd_set_ch_font(GBK64);
  epd_set_en_font(ASCII64);
  epd_disp_string("Hora UTC:", 0, 240);
  epd_disp_string(horaUTC, 350, 240);
    ////Dirección IP
  epd_set_ch_font(GBK64);
  epd_set_en_font(ASCII64);
  epd_disp_string("Direccion IP: ", 0, 310);
  epd_disp_string(dir_ip, 350, 310);
  epd_udpate();
}

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// Canal de youtube http://www.youtube.com/user/carlosvolt?sub_confirmation=1

//Tik-Tok https://www.tiktok.com/@carlosvolt

//https://www.instagram.com/carlosvolt_electronic_robotic

#include <WiFi.h>

#include <Wire.h>

#include <NTPClient.h>

#include "DHT.h"

#include <epd.h>//Librería para el control del display

// Descomenta le linea dependiendo del sensor que vallas a usar

#define DHTTYPE DHT11 // DHT 11

//#define DHTTYPE DHT21 // DHT 21

//#define DHTTYPE DHT22 // DHT 22

#define DHTPin 23 //PIin del sensor DHT;

DHT dht(DHTPin, DHTTYPE);

float t;

float h;

char temp[32];

char hume[32];

String ip;

String hora;

const void * dir_ip;

const void * horaUTC;

int periodo = 10000;

unsigned long Tiempo = 0;

WiFiUDP ntpUDP;

NTPClient timeClient(ntpUDP);

const char* ssid = "Tu_red_Wifi";

const char* password = "Tu_Clave_Wifi";

WiFiServer server(80);

void setup() {

Serial.begin(115200);

dht.begin();//Inicializar el sensor DHT

Serial.print("Conectando a la red WiFi");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.println("Conectado con éxito a la red WiFi.");

Serial.println("La dirección IP es: ");

Serial.println(WiFi.localIP());

server.begin();

Serial.println("Servidor iniciado");

timeClient.begin();//Inicializa servidor NTP

//Inicializamos el el display

epd_init();

epd_wakeup();

epd_set_memory(MEM_NAND);

delay(2000);

}

void loop()

{

timeClient.update();//Obtenemos la hora actulizada

h = dht.readHumidity();//Lectura de la humedad

t = dht.readTemperature();//Lectura de la temperatura

//Adactamos los datos de temperatura y humedad, direción ip y hora UTC para mostrarlo en el display

dtostrf(t, 8, 2, temp);

dtostrf(h, 8, 2, hume);

ip = String() + WiFi.localIP()[0] + "." + WiFi.localIP()[1] + "." + WiFi.localIP()[2] + "." + WiFi.localIP()[3];

hora = timeClient.getFormattedTime();

dir_ip = ip.c_str();

horaUTC = hora.c_str();

//////Se cumple esta condición cada 10 segundos

if(millis() > Tiempo + periodo){

Tiempo = millis();

textoDisplay();//Llamamos a la función para mostrar datos en el display

}

WiFiClient client = server.available();

if (client)//Si se cumple la condición, mostramos dotos en el webserver

{

Serial.println("Cliente web conectado ");

String request = client.readStringUntil('\r');

client.println("HTTP/1.1 200 OK");

client.println("Content-type:text/html");

client.println("Connection: close");

client.println();

client.println("<!DOCTYPE html><html>");

client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");

client.println("<link rel=\"icon\" href=\"data:,\">");

client.println("</style></head><body><h1>Servidor Web con esp32 y display E-Paper</h1>");

client.println("<h2>Tipo de sensor DHT11</h2>");

client.println("<h2>www.rogerbit.com</h2>");

client.println("<table><tr><th>Valores Leidos</th><th>VALUE</th></tr>");

client.println("<tr><td>Temp. Celsius</td><td><span class=\"sensor\">");

client.println(t);

client.println(" *C</span></td></tr>");

client.println("<tr><td>Humedad</td><td><span class=\"sensor\">");

client.println(h);

client.println(" %</span></td></tr>");

client.println("<tr><td>Ultima actualizacion Hora UTC</td><td><span class=\"sensor\">");

client.println(hora);

client.println("</span></td></tr>");

client.println("</body></html>");

client.stop();

client.println();

Serial.println("Client disconnected.");

Serial.println("");

}

void textoDisplay(void)

{

////Estación meteorológica

epd_set_ch_font(GBK64);

epd_set_en_font(ASCII64);

epd_disp_string("ESTACION-METEOROLAGICA", 0, 10);

////Temperatura

epd_set_ch_font(GBK64);

epd_set_en_font(ASCII64);

epd_disp_string("Temperatura: ", 0, 80);

epd_disp_string(temp, 350, 80);

epd_disp_string("Grados C", 510, 80);

////Humedad

epd_set_ch_font(GBK64);

epd_set_en_font(ASCII64);

epd_disp_string("Humedad: ", 0, 150);

epd_disp_string(hume, 350, 150);

epd_disp_string("Porciento", 510, 150);

////Hora UTC

epd_set_ch_font(GBK64);

epd_set_en_font(ASCII64);

epd_disp_string("Hora UTC:", 0, 240);

epd_disp_string(horaUTC, 350, 240);

////Dirección IP

epd_set_ch_font(GBK64);

epd_set_en_font(ASCII64);

epd_disp_string("Direccion IP: ", 0, 310);

epd_disp_string(dir_ip, 350, 310);

epd_udpate();

}

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"The Power Of The Bit"

Weather station with webserver, esp32 and e-paper screen

FEATURES of the ESP32-T module

Connectivity

Microcontroller features

Power and consumption modes

TEMPERATURE and Humidity Sensor DHT11

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