Display

This is a straightforward project for monitoring the indoor environment using an ESP32 and LCD panels. We are going to make use of an Indoor Environment Expansion board that has a DHT11 Temperature and Humidity Sensor as well as an SPG30 Air Quality Sensor installed on it. Measurements of CO2, TVOC, Temperature, and Humidity are taken with the Expansion Board. In the past, we measured the Indoor Air Quality with a BME680 Sensor. The LCD panel that is being utilized in this instance has a screen resolution of 320x480, a screen size of 3.5 inches, and an ILI9488 driver. It is essentially a TFT touch screen, but we are not going to make use of the touch function. Instead, we are going to use it as a colorful display. The first thing that we are going to do is make a lovely gauge that will show the current temperature, humidity, and CO2 levels. The three gauges will display whether there has been an increase or reduction in the pattern of circular widgets. As a second project, we will display the CO2 and TVOC values in a graphical way. This will be similar to the first project. The value of CO2 and TVOC will cause the graphs to either rise or fall, depending on the direction of the change. Indoor Environment Monitoring is a potential use for both the ESP32 and the TFT LCD Display.

ESP32+TFT Touch Display ESP32 3.5" TFT Touch (Capacitive) with Camera Indoor Environment Expansion board SPG30 + DHT11 Sensor + Buzzer USB Cable Type-C USB Cable for Programming Connecting Wires Male to Female Jumper Wires

ESP32 3.5-Inch TFT Capacitive Touch Screen Display with Camera This stunning touchscreen display has a 3.5-inch screen, is powered by an ESP32-WROVER chip, and incorporates an OV2640 camera with 2 million pixels. The incorporation of all of these element’s results in the creation of an ideal platform for a variety of ESP32 applications and projects. The TFT LCD driver is essentially an ILI9488, and it measures 3.5 inches in size and has a screen resolution of 320 by 480 pixels. The ILI9488 LCD communicates with the ESP32 microcontroller via SPI (Serial Peripheral

Interface). Making the display smooth enough for videos may require the SPI main clock to be increased to between 60M and 80M. You are free to make use of any and all of these pins on the breakout connections while the camera is not being utilized. After that, you may utilize the ESP32 display for any Internet of Things application you want by connecting it to sensors or modules. Programming in Arduino and MicroPython are both supported by the ESP32 microcontroller. A micro-SD Card slot is provided on the board for the purpose of adding an external SD Card. Files and pictures can be saved to the SD Card and accessed whenever necessary. There is a USB Type-C port available, which functions as a USB to UART converter and can be used for ESP32 programming. You can directly upload the code to the board by connecting a Type-C data connection to it and then following the on-screen instructions.

1. Display with a resolution of 320x480 and a size of 3.5 inches 2. Touch that can be both capacitive and resistive 3. Controller for the ESP32-WROVER 4. Connection through WIFI and BLE. 5. Programmable ESP32 device with an integrated USB2UART converter 6. 2M pixel OV2640 Camera 7. OV2640 supports produce photos up to 2 million pixels 7. Amorphous-TFT-LCD display with a 3.5-inch diagonal for use in mobile phones and other portable electronic devices 8. LCD Driver: ILI9488 9. LCD Resolution: 320*480

10. A slot for a Micro SD card affixed to the board 11. A control circuit for a resistive touch screen using four wires NS2009 12. The FT6236 is a single-chip capacitive touch panel controller Integrated Circuit. 13. Power supply is a 5V USB Type-C connection ESP32 Touch Indoor Environment Expansion This is an expansion board for the ESP32 3.5 Touch Screen that is designed for use in an indoor environment. Through the usage of the extension connector, the ESP32 3.5 TFT touch can also serve the purpose of a hardware expansion. As a result of the Indoor environment expansion's integration of the temperature and humidity sensor DHT11 and the SGP30 Air Quality Sensor, which allows for the detection of CO2 and TVOC, you will be able to quickly develop an indoor environment detector. In addition to that, there is a buzzer located on board that can be used for the alarm. Installing Required Libraries on the Arduino Integrated Development Environment 1. TFT eSPI Library This is a TFT graphics library for Arduino processors, optimized for performance for STM32, ESP8266, and ESP32. The library is formatted specifically for use with 32-bit processors. The "Four wire" SPI and 8 bit parallel interfaces are both supported by it. Some TFT displays are supported by the library, and drivers are provided for them (ILI9163, ILI9225, ILI9341, ILI9488, ST7735, etc.).

You will find a directory for the library on Github, from which you can download it. However, in order for our project to work properly, the library will need some modifications. Therefore, I present to you the revised version of the library. It is available for download, and you may put it in the library folder. 2. DHT11 Library We need a temperature humidity sensor of some kind so that we can read the temperature and the humidity. The DHT11 is the best and most affordable sensor for this purpose. In order to do that, we need to install the DHT11 Library. You can add the library to the Arduino IDE by downloading it from the link below. 3. Adafruit SPG30 Library SPG30 Sensor is required in order for us to read the environmental CO2 & TVOC Data. The Adafruit SGP30 Gas/Air Quality I2C sensor library can detect both total volatile organic compound and equivalent carbondioxide. Indoor Environment Monitoring on Gauge Let's utilize the ESP32 and LCD Screen to monitor the environment inside the building. The value of the temperature, humidity, and CO2 level will be displayed on the LCD Screen in the form of a Gauge. After you have connected the Type-C USB Cable to the ESP32 Board, you can then upload the code. After the code has been uploaded, you will need to press the reset button. After that, you will see three separate widgets or gauges displaying the data of the temperature, humidity, and CO2 levels.

Monitoring of CO2 and TVOC Historical Data Displayed in Graph Let's use the ESP32 and the LCD screen to monitor the CO2 and TVOC levels once more. Graphical representations of the CO2 and TVOC levels will be shown on the LCD screen as they are measured. in order to allow you to keep track of the historical data.

Repeat the uploading of the code. After the code has been uploaded, you will need to press the reset button. After that, graphical display data of CO2 and TVOC will be shown to you.