Simple Oxygen Concentrator You Can Assemble At Home

This home oxygen concentrator system is powered by an Arduino Uno board running a preprogrammed sketch that automates the separation of oxygen from ambient air. The power supply relies on a 15V AC step-down transformer connected to a bridge rectifier BR1 and a 12V voltage regulator IC1, supported by filter capacitors to supply a steady DC voltage to the control circuit. The Arduino manages a timed sequence of switching operations using six 2N2222 transistors (T1 through T6) acting as electronic switches. These transistors drive six 12V relays (RL1 through RL6), which in turn safely switch the higher-current solenoid valves (V1 through V6) and the air compressor. An air filtration unit first cleans the incoming air before the compressor pushes it through a flow control valve and into membrane canisters packed with zeolite sieves. The zeolite material selectively adsorbs nitrogen gas under pressure while allowing oxygen to pass through to the output. By cyclically opening and closing the solenoid valves via the relay bank, the Arduino purges the trapped nitrogen from the sieves, maintaining a continuous cycle of oxygen production. A 5mm LED and various resistors provide visual status indication for the operating circuit.