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Mining

Sparkminer

SparkMiner is open-source firmware for ESP32, ESP32-S3 and ESP32-C3 boards that performs Bitcoin solo mining using hardware-accelerated SHA-256 and pipelined assembly. The repository provides board-specific firmware images and setup instructions for microSD/Launcher installation, direct USB flashing and configuration through a Wi-Fi access point portal.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Sparkminer — OpenViST project profile in Mining.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use SparkMiner when you have a supported ESP32-family board and want to explore or demonstrate Bitcoin solo mining on embedded hardware. The project explicitly presents this use as educational and hobbyist rather than income-generating.

Who it is for

  • ESP32 hobbyists who want to assemble a Bitcoin solo-mining demonstration.
  • Developers exploring embedded SHA-256 mining on supported ESP32-family hardware.
  • CYD and other listed ESP32 board owners looking for firmware matched to their hardware variant.

Documented uses

  • Install mining firmware on a supported ESP32 board.
  • Configure Wi-Fi, a mining pool and a Bitcoin address for the device.
  • Build the firmware from source with the documented PlatformIO-based toolchain.
  • Explore an educational embedded Bitcoin-mining project.
Before you choose

Requirements & limits

The repository is public and lists the GPL-3.0 license. The documented source-build path uses Python and PlatformIO; the README also provides prebuilt firmware images.

  • Match the downloaded image to the precise board and display variant; the repository lists distinct files for several CYD, S3, C3 and generic ESP32 configurations.
  • The SD-card route requires a FAT32 microSD card and a config.json file; direct USB flashing instead uses a complete factory image.
  • Configuration requires Wi-Fi credentials, a pool hostname and port, and a Bitcoin address.
  • The project warns that ESP32 solo mining has extremely low odds of finding a block and is intended for education and experimentation, not profit.
  • The README reports approximate pool-observed hashrates; results can depend on hardware and setup.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Configure a flashed device through its Wi-Fi portal

Submit Wi-Fi, pool and Bitcoin-address settings to a SparkMiner device through its access-point portal.

Before you start

  • A SparkMiner device that has been flashed with a factory image
  • A Wi-Fi-capable computer or device
  • The Wi-Fi network name and password, mining-pool details and Bitcoin address

Steps

  1. Power on the device; the documented first-start route creates a Wi-Fi access point.

  2. Connect to the SparkMiner-XXXX network; the README lists minebitcoin as its password.

  3. Open http://192.168.4.1 in a browser and configure the device through the portal.

Expected outcome

The device receives the connection and mining configuration through its web portal.

Guide limitations

  • The README also documents a Python configuration utility, but this recipe covers the browser route only.
  • The portal route is described for a device without an SD-card configuration.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
8 October 2026
Original website title
SneezeGUI/SparkMiner · Official homepage title · retained in its source language
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