📟 DSOESP-– Bringing Modern Connectivity to Low-Cost Oscilloscopes

The DSO150 oscilloscope and similar low-cost digital scopes are widely used for basic signal visualization due to their affordability and portability. However, they have significant limitations when it comes to data storage, analysis, and real-time sharing—such as lacking built-in memory export, plotting on external devices, or wireless connectivity.

This project addresses those limitations by using an ESP32-C3 microcontroller to log serial output from the DSO as CSV files and host a modern web interface over Wi-Fi. Users can:

• Download, delete, or plot saved CSV files
• View SPIFFS storage usage
• Perform OTA firmware updates over the network

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🔧 Features

• Auto-connect to Wi-Fi using WiFiManager
• CSV file logging from serial input
• File browser with plot, download, and delete options
• Real-time Plotly plots of CSV data
• OTA (Over-the-Air) firmware update support

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📒 Changelog

v1.3 – July 2025

• ➕ Added metadata display panel below plot in grid layout
• 🧠 Auto-detects SampleInterval unit (ms or us) and updates x-axis label accordingly
• 💅 Improved UI layout and spacing for better readability on desktop and mobile

v1.2

• 📈 Integrated Plotly.js for waveform visualization
• 🗂️ Card-style interface added for clean plot layout
• 🌐 Query string (?name=...) support for selecting files to plot

v1.1

• 📤 Added OTA (Over-the-Air) firmware update capability
• 🧹 File manager supports download and delete actions
• 📊 SPIFFS usage now displayed in UI

v1.0

• 🚀 Initial release
• 📡 Serial data logging from DSO150 to ESP32-C3 via UART
• 📁 CSV file creation and manual access over Wi-Fi
• 🌐 WiFiManager setup for headless configuration

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📦 Required Libraries

Before uploading, install these libraries via Arduino Library Manager or PlatformIO:

Library	Author
WiFiManager	tzapu
ESPAsyncWebServer	me-no-dev
AsyncTCP	me-no-dev
LittleFS	lorol
ArduinoOTA	Espressif Systems

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🚀 Uploading to ESP32

1. ⚙️ Board Setup

• Open Arduino IDE
• Go to Tools → Board and select:
  ESP32C3 Dev Module (or your specific ESP32 board)
• Set Upload Speed to 115200
• Under Partition Scheme, choose Default 4MB with spiffs (1.5MB APP/1.5MB SPIFFS)

2. 🧠 Upload the Firmware

• Click Upload in Arduino IDE

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🌐 Using the Web Interface

1. On first boot, the ESP32 creates a Wi-Fi hotspot:
   SSID: DSOESP
   Password: DSOESPARABI

2. Connect to this Wi-Fi from your computer or phone

3. The Captive Portal opens automatically (or navigate to 192.168.4.1)
   ➤ Connect to your home Wi-Fi

4. After reboot, open the ESP32's IP address (check Serial Monitor)
   The web interface shows:

   • List of CSV files
   • File size
   • Plot and download buttons
   • SPIFFS usage bar

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🛠 Developer Notes

• CSV Format: t,v (e.g., time and voltage)
• OTA works over the local network (via ArduinoOTA)
• File naming: /data_0.csv, /data_1.csv, etc.
• File size limited by available SPIFFS space (~1.5MB)

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⚙️

Hardware wiring instructions coming soon...

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📃 License

MIT License