https://github.com/androidcrypto/esp32_cyd_wifi_analyzer

Design a Wi-Fi analyzer on an ESP32 Cheap Yellow Display (CYD)
https://github.com/androidcrypto/esp32_cyd_wifi_analyzer

analyzer cheap-yellow-display cyd esp32 ili9341 st7789 st7796 wifi

Last synced: 3 months ago
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Design a Wi-Fi analyzer on an ESP32 Cheap Yellow Display (CYD)

• Host: GitHub
• URL: https://github.com/androidcrypto/esp32_cyd_wifi_analyzer
• Owner: AndroidCrypto
• License: mit
• Created: 2025-11-28T10:03:23.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2025-11-28T15:42:30.000Z (5 months ago)
• Last Synced: 2025-11-30T21:30:12.718Z (5 months ago)
• Topics: analyzer, cheap-yellow-display, cyd, esp32, ili9341, st7789, st7796, wifi
• Language: C++
• Homepage: https://medium.com/@androidcrypto/use-an-esp32-cheap-yellow-device-as-graphical-wi-fi-analyzer-47549374a1e3
• Size: 1.38 MB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# ESP32 Cheap Yellow Display (CYD) Wi-Fi Analyzer

This is the accompanying repository for my article "**Use an ESP32 Cheap Yellow Device as graphical Wi-Fi Analyzer**" available here: https://medium.com/@androidcrypto/use-an-esp32-cheap-yellow-device-as-graphical-wi-fi-analyzer-47549374a1e3

For short - what is a "Cheap Yellow Display" ? This device was introduced some years ago and allowed for very fast development of projects where an ESP32, a TFT (optional Touch surface), an SD Card Reader and an RGB LED is included. The first version was equipped with a 2.8 inch large TFT display with **ILI9341** driver chip and **XPT2046** resistive Touch driver chip. Newer versions are sold with a **ST7789** display driver chip. Nowadays, the device is available with different display sizes (1.28 up to 7 inches) and driver chips, and for this project I'm using 1.9-inches variants The display has a resolution of **320 x 170** pixels in Landscape orientation. Most of the devices are driven by an ESP32 WROOM microcontroller, but I saw some others with an ESP32-S3 chip.

![Image 1](./images/esp32_cyd_2_8_st7789_wifi_scanner_600w.png)

## Required Library

````plaintext

GFX library for Arduino Version 1.6.3, https://github.com/moononournation/Arduino_GFX

````

![Image 1](./images/esp32_cyd_1_9_st7789_wifi_scanner_600w.png)

## Development Environment

````plaintext

Arduino IDE Version 2.3.6 (Windows)

arduino-esp32 boards Version 3.2.0 (https://github.com/espressif/arduino-esp32)

Board: ESP32 Dev Module

````

![Image 1](./images/esp32_cyd_3_5_st7796_wifi_scanner_600w.png)