Inaki Iturriaga

ARGENTINA • + Follow

Engineer

CHILE
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1

Components

	WEMOS-D1-MINI	x 1
	Lolin 2.13	x 1
	TP4056	x 1
	18650	x 1
	18650 Battery Holder	x 1

Tools, APP Software Used etc.

	Soldering Iron Kit
	arduino IDE Arduino

Description

Wifi Weather Station - Display unit

WiFi Weather Station - Display Unit

In this technologically advanced age, countless electronics projects incorporate various components to collect, process, and display data for a wide range of applications. This custom display unit, coined as the WiFi Weather Station, functions as a robust, adaptable platform allowing seamless data display from a Wemos D1 Mini, an 18650 battery and a holder, a TP4056 charge module, and a 2.13" Lolin e-paper display.

Disclaimer:

Please note that this WiFi Weather Station - Display Unit is designed to work in conjunction with a corresponding Sensor Unit. The data displayed by this unit is collected by the Sensor Unit, which contains various environmental sensors. For the Display Unit to function correctly, it must receive data from the Sensor Unit.

Possible Applications:

Weather Monitoring: Consolidating data from various sensors and presenting them in an accessible, user-friendly format, the WiFi Weather Station proves to be a powerful tool for weather monitoring and forecasting, making it perfect for outdoor enthusiasts, farmers, and researchers.
Portable Devices: Owing to the compact design and the battery power supply, this WiFi Weather Station can be a useful tool in various portable devices, including portable weather monitors, camping gadgets, and hiking equipment.
IoT and Smart Home Devices: The small and modular design of this WiFi Weather Station makes it an excellent fit for various IoT and smart home devices, like smart thermostats, weather stations, or even digital picture frames.

Building Guide - Display Unit

Gather the necessary tools and materials: Ensure you have a Wemos D1 Mini, an 18650 battery and holder, a TP4056 charge module, a 2.13" Lolin e-paper display, soldering iron, solder, flux, desoldering wick or pump, brass sponge or steel wool for cleaning the soldering iron tip, heat-resistant surface or soldering mat, and tweezers or small pliers for holding components.
Prepare the PCB board: Clean the PCB board with isopropyl alcohol and a lint-free cloth to remove any dust or grease, ensuring proper solder adherence.
Prepare the components: Inspect each component and their male pins (headers) for any damage. Correct any bent pins and trim excessive leads if needed.
Insert the male pins into the components: For the Wemos D1 Mini and the Lolin e-paper display, gently insert the pins into the suitable holes. Make sure the pins are correctly aligned and securely inserted.
Secure the components to the PCB: Place each component on the PCB, aligning the male pins with the corresponding solder pads or holes. Secure the components with masking tape, Blu-Tack, or a tiny amount of hot glue.
Heat up the soldering iron: Switch on your soldering iron and let it reach the appropriate temperature (around 350°C or 650°F for 60/40 solder).
Tin the soldering iron tip: Apply a small amount of solder to the iron tip to create a thin layer of molten solder. This process, known as "tinning," enhances heat transfer and simplifies the soldering process.
Solder the components to the PCB: Hold the soldering iron in one hand and the solder in the other. Touch the iron tip to the junction of the component lead (or male pin) and the PCB pad. After a brief moment, introduce the solder to the joint. The solder should flow smoothly and create a shiny, concave fillet. Simultaneously remove the solder and the iron, allowing the joint to cool. Repeat for each component lead or pin.
Inspect the solder joints: Use a magnifying glass or microscope to scrutinize the solder joints for any cold solder, bridges, or other defects. Cold solder joints appear dull or grainy and may result in poor connections. Bridges are undesired solder connections between adjacent pads or traces and may cause short circuits.
Fix any issues: If you find any solder joint problems, use a desoldering wick or pump to remove the excess solder, clean the area, and try again. If a component is poorly aligned or damaged, carefully remove it, clean the area, and replace it with a new component.
Clean the PCB: After successfully soldering all components, clean the PCB with isopropyl alcohol and a lint-free cloth to remove any residual flux.
Test the assembled board: After the PCB has dried, power up the board using the 18650 battery, and test its functionality. If everything works as expected, congratulations! You've successfully assembled your custom Display Unit.
Program the board: Use the provided Arduino code to test the display unit, making sure it functions as expected. Then, customize the code to meet your specific requirements.

Code

code

Arduino

#include <ESP8266WiFi.h>
#include <ArduinoJson.h>
#include <GxEPD2_BW.h>
#include <Wire.h>

// Display parameters for Lolin 2.13" ePaper Display
GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));

// WiFi network details
const char* ssid = "your_AP_name";
const char* password = "your_AP_password";
const char* host = "192.168.4.1";  // IP of device 1

// Time delay for changing displayed data
unsigned long delayTime = 10000;  // Change every 10 seconds
unsigned long lastChange = 0;
int dataItem = 0;

void setup() {
  Serial.begin(9600);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize the display
  display.init(115200);
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);
  display.setFullWindow();
}

void loop() {
  // Change displayed data every 10 seconds
  if (millis() - lastChange > delayTime) {
    lastChange = millis();
    dataItem = (dataItem + 1) % 6;  // Cycle through 6 data items

    // Fetch data from device 1
    WiFiClient client;
    if (!client.connect(host, 80)) {
      Serial.println("Failed to connect to device 1");
      return;
    }
    client.print(String("GET /") + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n\r\n");
    delay(10);

    // Read JSON response
    String json = "";
    while (client.connected()) {
      String line = client.readStringUntil('\r');
      json += line;
    }

    // Parse JSON
    StaticJsonDocument<200> doc;
    DeserializationError error = deserializeJson(doc, json);
    if (error) {
      Serial.println("Failed to parse JSON");
      return;
    }

    // Display sensor data
    display.firstPage();
    do {
      display.fillScreen(GxEPD_WHITE);
      String displayText;
      switch (dataItem) {
        case 0: displayText = "Temperature: " + String((float)doc["temperature"]); break;
        case 1: displayText = "Pressure: " + String((float)doc["pressure"]); break;
        case 2: displayText = "UV Index: " + String((int)doc["uvIndex"]); break;
        case 3: displayText = "Humidity: " + String((float)doc["humidity"]); break;
        case 4: displayText = "Time: " + String((const char*)doc["time"]); break;
        case 5: displayText = "CO2: " + String((float)doc["co2"]); break;
      }
      display.setCursor(0, 15);
      display.println(displayText);
    } while (display.nextPage());
  }
}

CAD-Custom parts and enclosures

Weather11.stl

Weather22.stl

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Jul 03,2023

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Wifi Weather Station - Display unit

Create your own WiFi Weather Station with two interconnected devices!

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Published: Jul 03,2023

Download Gerber file 2

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