This project includes both hardware description & all needed software and firmware.

Blender is built to mix EAN and Trimix mixtures dynamically, with no more than 40% of oxygen.

Main electronic components:

• MCU: Atmega64. 16 or 32kB versions could be used with no/minimum code changes (untested).
• ADC: AD7793. Used to get accurate O2 readings.
• Any oxygen sensors with 7-25mV @ 21% O2 output could be used without any changes.

Software needed to work with schematic and board:

• Eagle for schematic and board. Free version is enough.
• FreeRouting - was used for initial routing. Optional.
• Gerbv to preview gerbers. Optional - just to control them before factory processing.

I've ordered PCB's at SeeedStudio, but feel free to use any PCB factory with equivalent capabilities. Board size is 44x122mm.

Developed by DiveTeam 🚣