M45 Core turns a supported ESP32 display board into a small, standalone Bitcoin lottery miner. It connects to your Wi-Fi and mining pool, shows live mining information on its screen, and has a simple settings page you can open from your phone or computer.
On supported hardware, it averages about 620 kH/s. Mining rewards are not guaranteed.
The ready-to-use firmware supports these two classic ESP32 boards:
| Screen | Supported hardware | Store | Price |
|---|---|---|---|
| OLED | ESP32-WROOM-32 with a 128x64 SSD1306 OLED wired to pins 5 and 4 | AliExpress | US $0.99–$7.00 |
| OLED | ESP32-WROOM-32 with a 128x64 SSD1306 OLED wired to pins 5 and 4 | Amazon | US $11.99 |
| LCD | ideaspark ESP32-WROOM-32 with a 1.9-inch, 320x170 ST7789 display | Amazon | US $15.99 |
Board listings often look very similar. The ready-to-use firmware does not support ESP32-C3, ESP32-S3, ESP32-1732S019, or OLED boards wired to pins 21 and 22. Check the chip and display details before ordering.
Prices and board revisions can change, so confirm the listing details before you buy.
You need a supported board, a USB data cable, and a desktop computer running Chrome or Edge.
- Connect the board to your computer with USB.
- Open the M45 Core browser flasher.
- Choose the firmware that matches your screen: OLED or LCD.
- Click Flash Firmware and select your board's serial connection.
- When flashing finishes, wait for the setup Wi-Fi name and address to appear on the board's screen.
- On your phone or computer, join the Wi-Fi network named something like
m-ABCD. - Open the address shown on the screen and enter your home Wi-Fi details.
The board will restart and connect to your home Wi-Fi. Open the new address shown on its screen to enter your wallet and pool settings or view mining stats.
For upgrades and other flashing methods, see the flashing guide.
- See live hashrate, shares, pool status, best share, and block-found alerts.
- Change Wi-Fi, pool, wallet, display, and performance settings from a web browser.
- Use a main and backup mining pool.
- Adjust screen brightness, theme, orientation, and sleep time.
- Keep your settings when installing an update with the browser flasher.
| OLED display | 1.9-inch LCD | Web stats | Web settings |
|---|---|---|---|
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 |
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Watch the example block-found screens.
- Open the IP address shown on the screen to see stats and settings.
- Press the BOOT button briefly to move between display pages.
- Hold BOOT for 5 seconds to erase saved settings and start setup again.
- To change Wi-Fi, open the device's web settings page and choose Wi-Fi.
The device usage guide has more detail about mining, display settings, and factory resets.
- Make sure you are using Chrome or Edge on a desktop computer.
- Make sure your USB cable supports data, not only charging.
- If flashing cannot connect, hold BOOT while the flasher tries again.
- If the board keeps its old settings, flash again with Reset WiFi and pool settings selected.
- Double-check that your board is one of the supported models above.
More solutions are in the flashing guide.
Building from source requires the official ESP-IDF toolchain. See the script and build guide for setup, build, flash, monitoring, and benchmark commands. ESP32-S3 is available only as a slower source-build compatibility target; it is not supported by the release images.
TLS is currently disabled to conserve memory. See TLS support notes for technical details.
M45 Core Firmware is released under the MIT License. See LICENSE, ATTRIBUTION.md, and THIRD_PARTY_NOTICES.md.