BitAxe Ultra: 3rd Major Revision Based on BM1366 ASIC

"The bitaxeUltra is an open source Bitcoin ASIC miner project based on the BM1366 ASIC used in the Antminer S19XP."

BitAxe Ultra: 3rd Major Revision Based on BM1366 ASIC
  • "Bitaxe is a fully open source hardware Bitcoin ASIC miner. Ultra is the 3rd major revision of the bitaxe that now includes the BM1366 ASIC from the S19XP."
  • "v1 hardware has been built, and it does mine! Quite well actually. Be sure to check the issues for known bugs, reworks and errata."
  • "This is an advanced build! It's also still early days, so prolly not the best thing if you're just looking for a bitcoin miner to run."
"The bitaxeUltra (BM1366, S19XP) has a slightly higher hashrate and better efficiency. Under the hood there are several improvements that make this a much more extensible ASIC to design with. But it does cost more than the bitaxeMax (BM1397, S17)."


  • Standalone: can mine directly to your pool over WiFi. No External computer needed.
  • Embedded: low cost, low maintenance, high availability, high reliability, low power.
  • ASIC: based on the very, very efficient BM1366 from Bitmain.
  • Versatile: solo/pool mining, autotune power/heat/efficiency.
  • Open Source: All design files are provided.


  • ESP32-S3-WROOM-1 wifi microcontroller on board
  • TI TPS40305 buck regulator steps down the 5V input to power the BM1366
  • Maxim DS4432U+ current DAC digitally adjusts the BM1366 core voltage from 0.04V to 2.4V
  • TI INA260 power meter measures the input voltage and current of the miner
  • Microchip EMC2101 PWM controls the fan and monitors tach output. Measuring internal die temp isn't working.
  • 0.91" SSD1306 OLED I2C Display Module

GitHub Repo