Build a Portable IoT Display with ESP32

This is a portable IoT display project, which can be developed into various practical tools based on it and the Arduino_GFX library. For example, WiFi signal analysis, digital photo frame, etc. With a well-designed 3D printed case, it can be easily hung on a keychain or backpack for portability.

Material List

• TTGO T7 V1.0 (ESP32 WiFi module) × 1
• 2-inch IPS LCD × 1
• 402035 Lipo lithium battery × 1
• D-shaped climbing buckle × 1

3D Printed Case

You can choose to download the 3D printing files at the end of the article to print the case.

You can also choose to download directly from Thingiverse:https://www.thingiverse.com/thing:4564272

Soldering the Circuit

Refer to the LCD’s Datasheet for pin connections. Be sure to read the Datasheet thoroughly before connecting, especially if the LCD model you ordered differs from the one here.

ESP32   -> LCD
GND     -> Pin  1 GND
        -> Pin  2 LED K
3v3.    -> Pin  4 Vcc -> 20 Ohm -> Pin 3 LEDA
GPIO 27 -> Pin  7 D/C
GPIO  5 -> Pin  8 CS
GPIO 18 -> Pin  9 SCK
GPIO 23 -> Pin 10 MOSI
GPIO 33 -> Pin 11 RST

Assembly

Seal the soldered joints and exposed pins with tape.

Assemble the module and case according to the video below.

Programming

Arduino IDE

If you have not installed the Arduino IDE, you need to download and install it:https://www.arduino.cc/en/main/software

ESP32 Support

Follow the instructions in the link below to install ESP32 support:https://github.com/espressif/arduino-esp32

Arduino_GFX Library

Download the latest version of the Arduino_GFX library: (“Clone or Download” -> “Download ZIP”)https://github.com/moononournation/Arduino_GFX

Import this library in the Arduino IDE. (Arduino IDE “Sketch” Menu -> “Include Library” -> “Add .ZIP Library” -> select the downloaded zip file)

Compile and Upload

• Connect to the computer with a USB cable, open Arduino IDE.

• Open the ESPWiFiAnalyzer example code (“File” -> “Example” -> “Arduino_GFX” -> “ESPWiFiAnalyzer”)

• Click the Arduino IDE “Upload” button.

• The ESPWiFiAnalyzer.ino code file is also provided for download at the end.

Completion

This 2-inch IoT display can not only be used for WiFi signal detection analysis, but the ESP32 also has more possibilities. It’s time to unleash your imagination to make it more fun!