OverMiner Nano

Pocket-sized Kaspa lottery miner with a touchscreen

Price: ~$15 hardware (DIY firmware flash)

Download Latest .binView on GitHub
Available • v1.0.0
Important: OverMiner Nano and Lite are ultra-low hashrate devices. Mining will only produce valid shares on the OverBuild Labs Solo Mining Pool, which is specifically modified to accept fractional difficulty. Do not expect other pools to support the low difficulty required by these devices. Hardware terms & disclaimers.

Bring your own hardware

OverMiner Nano is open-source firmware for the ESP32-2432S028R, commonly sold as the "Cheap Yellow Display" (CYD). Source the board from your preferred retailer, flash our firmware, and you're mining.

What you'll need

  • ESP32-2432S028R board (search "Cheap Yellow Display" or "CYD")
  • USB-Micro cable for power and flashing
  • 2.4 GHz WiFi network (no 5 GHz support)
  • A modern web browser for flashing and configuration
Safe operation: Use only a quality 5V DC USB power supply rated for at least 1A. Keep the board ventilated and away from flammable materials. Do not leave it unattended during initial use. See hardware terms.

Features

  • Stratum to any Kaspa pool
  • Captive-portal first-time setup (no app needed)
  • Built-in web UI with live stats, config, and OTA firmware updates
  • mDNS announcement for OverManager auto-discovery
  • Persistent lifetime share and block counters
  • NTP-synced event log

Technical Specifications

Board
ESP32-2432S028R (Cheap Yellow Display)
Display
2.8" 240×320 resistive touchscreen
Connectivity
WiFi 2.4GHz + Bluetooth (unused)
Memory
4 MB flash, no PSRAM
Power
USB-Micro (power + flashing)
Hashrate
~1 KH/s (kHeavyHash, lottery-tier)

Getting Started

High-level overview. Full step-by-step instructions live in the project README on GitHub.

  1. 1

    Get the hardware

    Order an ESP32-2432S028R "Cheap Yellow Display" (CYD) board from any retailer that carries them.

  2. 2

    Download the firmware

    Grab the latest pre-built .bin from the releases page.

    Latest release
  3. 3

    Flash it

    Use a Web Serial flasher (Chrome or Edge) or esptool from the command line. The README walks through both options.

    Flashing guide
  4. 4

    First-boot setup

    Power the board via USB-Micro, then connect to the "OverMiner-Nano-XXXX" WiFi network it advertises. The captive portal opens automatically — pick your home WiFi, enter the credentials, and the device joins your LAN.

  5. 5

    Configure mining

    Open the device's web UI (mDNS name or IP shown on the screen). Enter pool URL stratum+tcp://pool.overbuildlabs.com:5558, your Kaspa wallet address, and a worker name. Save and start mining.

  6. 6

    Track shares

    Lifetime share and block counters live on-device. Pool-side stats appear on our pool dashboard.

    Pool dashboard
Default web UI password: kaspa123 — change it from the device's web UI on first login.

Plays well with OverManager

OverMiner Nano announces itself via mDNS so OverManager can auto-discover it on your LAN. Monitor hashrate, restart, configure pool — same interface as your ASICs.

Learn about OverManager

Build it. Flash it. Mine.

Open source. MIT licensed. Yours to hack on.

Download LatestGitHub