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YUMO PULSE — ESP32-C3 Desk Gadget

Tiny ESP32-C3 desk gadget with OLED, live weather sensing, proximity glow & a phone-controlled web interface.

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It runs on a tiny ESP32-C3 Super Mini and packs live temperature and humidity sensing, NTP-synced time, hand-proximity detection, and a web interface into a compact resin-cast.

for wiring check the links

GitHub:
https://github.com/yumobuilds/yumo-pulse

YouTube :
https://youtu.be/wUF-UrtmaxU?si=gIzn5KpYT17JplZ_

Features:

🕐 Clock Page — auto-detected city/timezone via NTP, live HH:MM with flashing colon and seconds

💧 Humidity Page — live SHT3X readings with a custom pixel drop icon

🌡️ Temperature Page — live SHT3X readings with a custom pixel thermometer icon

Brand Page — animated YUMO BUILDS frame, sine-wave contrast pulsing synced to the LEDs

🌐 Web Interface — check live sensor data or send custom text to the OLED from any phone or browser

🤚 Proximity Detection — self-calibrating bare-wire antenna on GPIO7; red LED brightens as your hand gets closer

🌙 Night Mode — midnight–5am, OLED dims and LEDs reduce to save battery

💡 Multi-Role LEDs — five LEDs, each with a distinct job: seconds blink, frame glow, status flash, proximity ramp, text wave

📶 WiFiManager — captive portal on first boot, no hardcoded credentials

🧠 On-Device Processing — fully local, no external services

heat up the surface.png

Portable Network Graphics (PNG) - 2.12 MB - 07/18/2026 at 19:07

Preview

uploading code.png

Portable Network Graphics (PNG) - 3.10 MB - 07/18/2026 at 19:07

Preview

finishing.png

Portable Network Graphics (PNG) - 3.06 MB - 07/18/2026 at 19:07

Preview

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finishing look, after 24 hours

Portable Network Graphics (PNG) - 2.40 MB - 07/18/2026 at 19:07

Preview

pouring the resin.png

pouring the epoxy resin.

Portable Network Graphics (PNG) - 1.85 MB - 07/18/2026 at 19:07

Preview

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  • 1 × ESP32-C3 Super Mini Main controller/microcontroller board
  • 1 × SHT3X Temperature & Humidity Sensor I2C sensor for live weather readings
  • 1 × 0.91" OLED Display (128×32, I2C) Main display for clock, sensor, and brand pages
  • 5 × Flexible LED Filament (3V) Used for the page glow and ambient lighting
  • 1 × 18650 Lithium Battery Portable power source

View all 8 components

  • 1
    Watch the Full Build Video

    For the complete build walkthrough — wiring, assembly, and code explanation — check out the full video on the YUMO BUILDS YouTube channel:

View all instructions

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