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This is a portable IoT display project that can be developed into various practical tools using the Arduino_GFX library. For example, WiFi signal analysis, electronic photo albums, etc. With a well-designed 3D printed case, it can be easily hung on a keychain or backpack for portability.
Material List
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TTGO T7 V1.0 (ESP32 WiFi Module) × 1
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402035 Lipo Lithium Battery × 1
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D-shaped Carabiner Clip × 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 Circuit Part
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 soldering points and exposed pins with tape.
Refer to the video below to assemble the module and case.
Programming
Arduino IDE
If you have not installed 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 Arduino IDE. (Arduino IDE “Sketch” Menu -> “Include Library” -> “Add .ZIP Library” -> select the downloaded zip file)
Compile and Upload
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Connect via USB cable to your computer and open Arduino IDE.
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Open the ESPWiFiAnalyzer example code (“File” -> “Example” -> “Arduino_GFX” -> “ESPWiFiAnalyzer”)
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Click the Arduino IDE “Upload” button.
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The ESPWiFiAnalyzer.ino code file is also available 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 many more possibilities. It’s time to unleash your imagination to make it more fun!
Original link: https://www.instructables.com/Portable-IoT-Display/
Original author: Chen Liang
Translated first published in: Fun Without Limits
Editor: DF Maker Community
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