Indoor Environment Monitoring with ESP32 & LCD Screen

Overview
This is a simple Indoor Environment Monitoring Project with ESP32 & LCD screens. We will utilize the Indoor Environment Expansion board made using DHT11 Humidity & Temperature Sensor and
SPG30 Air Quality Sensor
. The expansion board is used for measuring CO2, TVOC, Temperature and Humidity. Earlier we used
BME680 Sensor
the Indoor Air Quality.
The LCD Screen used here is having an ILI9488 driver with a screen size of 3.5″ & a screen resolution of 320×480. It is basically a TFT touch screen but we will not be using the touch function but rather use it as a colorful display.
As a first project, we will display the Temperature, Humidity & CO2 value in a beautiful gauge. The three gauges will show the increase or decrease in circular widgets pattern. Similarly, as a second project, we will display the CO2 & TVOC value in a graphical format. The graphs will rise and fall on the basis of an increase or decrease in CO2 & TVOC value. The ESP32 & TFT LCD Display can be used in Indoor Environment Monitoring.
Bill of Materials
Following is the list of components that you need for making this project. You can purchase all these components online.
S.N.
Components
Description
Quantity
Purchase Links
1
ESP32+TFT Touch Display
ESP32 3.5\" TFT Touch(Capacitive) with Camera
1
Makerfabs Link
2
Indoor Environment Expansion board
SPG30 + DHT11 Sensor + Buzzer
1
Makerfabs Link
3
USB Cable
Type-C USB Cable for Programming
1
Amazon
AliExpress
3
Connecting Wires
Male to Female Jumper Wires
3
Amazon
AliExpress
ESP32 3.5″ TFT Touch(Capacitive) with Camera
This is a beautiful
3.5” touchscreen display
, based on
ESP32-WROVER chip
, with a built-in
2M pixel OV2640 camera
. The combination of all these gives a perfect platform for multiple ESP32 Applications & Projects.
The TFT LCD driver is basically
ILI9488
& has a dimension of
3.5″
with
320×480
screen resolution. The
ILI9488 LCD
uses SPI for communication with the ESP32 chip. The SPI main clock could be up to
60M~80M
, make the display smooth enough for videos.
While the camera is not used, you can freely use all these pins with the breakout connectors. You can then connect the ESP32 display with sensors or modules & use it for any
IoT applications
. The ESP32 chip support Arduino or MicroPython programming
The board is having a
micro SD-Card slot
for attaching an external SD-Card. The SD Card can be used for storing files and images. There is a
type C USB Port
, basically a USB to UART converter for ESP32 programming. You can connect a Type-C data cable to the board & directly upload the code to the Board.
Specification
1. 3.5 inch display,
320×480
2. Capacitive/Resistive Touch
3. ESP32-WROVER Controller
4.
WIFI/ BLE
Connection.
5. Onboard USB2UART convertor for ESP32 programming
6. 2M pixel OV2640 Camera
7.
OV2640
supports output images up to 2 million pixels
8. LCD 3.5-inch Amorphous-TFT-LCD for mobile-phone or handy electrical equipment
9. LCD Driver: ILI9488
10. LCD Resolution: 320*480
11. Micro SD card slot on the board
12.
NS2009
: A 4-wire resistive touch screen control circuit
13.
FT6236
: single-chip capacitive touch panel controller Integrated Circuit
14. Power supply:
5V
, Type-C USB
Check some of our previous projects using this TFT Touch Screen Display:
1.
ESP32 TFT Touch Display Video Games
2.
ESP32 TFT Touch & Camera Projects
3.
Ultrasonic Range Finder
4.
Wind Speed Display
5.
Temperature Humidity Monitoring
ESP32 Touch Indoor Environment Expansion
This is an Indoor environment expansion board for the ESP32 3.5 Touch Screen. The ESP32 3.5 TFT touch can also be used as a hardware expansion, with the expansion connector.
The Indoor environment expansion integrates the temperature & humidity sensor DHT11 and SGP30 Air Quality Sensor, to detect the CO2 and TVOC, so you can create an indoor environment detector easily. There is also an onboard buzzer that can be used for the alarm.
Installing Necessary Libraries to Arduino IDE
1. TFT_eSPI Library
This is a TFT graphics library for Arduino processors with performance optimization for STM32, ESP8266 & ESP32. The library is targeted at 32-bit processors. It supports “Four wire” SPI and 8 bit parallel interfaces. The library supports some TFT displays with drivers for ILI9163, ILI9225, ILI9341, ILI9488, ST7735 etc.
You can download the library from the
Github
directory. But the library requires some modification for our project. So here is an edited version of the library. You can download and add it to the library folder.
Download:
TFT_eSPI Library
2. DHT11 Library
To read the temperature and humidity we need any temperature humidity sensor. For that DHT11 is the best and cheap sensor. We need to install DHT11 Library for that. Download the library from below and add to the Arduino IDE.
Download:
DHT11 Library
3. Adafruit SPG30 Library
To read the environmental CO2 & TVOC Data, we need SPG30 Sensor. The Adafruit SGP30 Gas/Air Quality I2C sensor library measure equivalent carbondioxide as well as Total Volatile Organic Compound.
Download:
Adafruit SPG30 Library
Indoor Environment Monitoring on Gauge
Let us use the ESP32 & LCD Screen for Indoor Environment Monitoring. The LCD Screen will display the value of temperature, humidity, and CO2 level in Gauge format.
The below code uses two files one as a .ino file and the other as a .h file.
Main Code
Copy the following code and paste it on your Arduino IDE and save it as .ino format.
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// Meter colour schemes
#define RED2RED 0
#define GREEN2GREEN 1
#define BLUE2BLUE 2
#define BLUE2RED 3
#define GREEN2RED 4
#define RED2GREEN 5
#define TFT_GREY 0x2104 // Dark grey 16 bit colour
#include \"alert.h\" // Out of range alert icon
#include `TFT_eSPI.h` // Hardware-specific library
#include `SPI.h`
#include `Wire.h`
#include \"Adafruit_SGP30.h\"
#include \"DHT.h\"
#define BUZZPIN 5
#define LDO_PWR_EN_PIN 19 //AP2112K enable pin
#define BUZZER_ON digitalWrite(BUZZPIN, HIGH)
#define BUZZER_OFF digitalWrite(BUZZPIN, LOW)
#define LDO_1V8_ON digitalWrite(LDO_PWR_EN_PIN, HIGH)
#define LDO_1V8_OFF digitalWrite(LDO_PWR_EN_PIN, LOW)
#define DHTPIN 18 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT11
DHT
dht
(
DHTPIN
DHTTYPE
)
;
Adafruit_SGP30
sgp
;
#define I2C_SDA 26
#define I2C_SCL 27
TFT_eSPI
tft
=
TF