Closed Source is Antithetical to Bitcoin
supraHex is a follow on to the bitaxe that incorporates six BM1368 ASICs from the Antminer S21
- 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 efficient BM1368 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 TPS546D24ARVFR buck regulator steps down the 12V input to power the chain of BM1368
- TMP1075 measures inlet and outlet PCB temperature.
- Microchip EMC2302 Controls dual fans
- Header for optional status LCD
- BAP (Bitaxe Accesory Port)
- ASIC Chip temperature directly from the ASIC's
- The BM1368 is a undocumented SHA256 mining ASIC from Bitmain. It's mostly used in the Antminer S21
- Bitmain claims the BM1368 has 17.5 W/TH efficiency
- The BM1368 is available (new) for around $20~29 each.
- v701 hardware is working! Hash rate is fluctuating between 4 TH/s and 4.2 TH/s.
- Power draw is around 75W @12V.
- ESP32 miner firmware will configure the power supply to run at the proper voltage.
- This is an advanced build! If you don't have experience building boards, you should probably go build a single ASIC bitaxe first to get the technique down.
- V701 is the current working version of this board. If you want to build this, pull down this git tag.
- BM1368 from NBTC. The
PBVariant seems to work fine. - Heatsink 90mm long variant. This will need to have threaded M3 mounting holes added. See the KiCad board file for the pattern
- Fans At least one 80x80mm 12V 4-pin fan. Like the Noctua NF-A8 PWM. Possibly two.
- Enclosure (several sellers) 130mm long variant. The supraHex needs to be run inside an enclosure to force air through the heatsink and effectively cool the BM1368s
- All of the parts on the board are listed in the KiCad BOM
- ESP-Miner-Multichip is still being updated to support multiple ASICs
- supraHex takes 12V DC input via screw terminals. Power supply should be capable of 100W
- This 120W Brick technically works, but gets a little warmer than it should. You'll need to change the end.
- 12V 15A 110V AliExpress Bare PSU
- Check out building.md for PCB ordering tips
- Check out assembly.md for assembly tips