Make Your Own Arduino-Based Oxygen Concentrator

This DIY oxygen concentrator project integrates a custom power supply circuit, an Arduino Uno microcontroller, and pneumatic components to separate oxygen from ambient air. Power management begins with a 12V DC power supply circuit built around a transformer, 1N4007 diodes, filtering capacitors, a 7812 voltage regulator, a current-limiting resistor, and an LED indicator, which steps down and regulates voltage for the control electronics. The Arduino Uno acts as the central processing unit, executing programmed logic via the Arduino IDE to sequence the mechanical operations. It interfaces with a control relay circuit to switch higher-power pneumatic actuators safely. The pneumatic subsystem relies on an air compressor to pressurize air, passing it through an air filtration unit to remove particulates and moisture. The pressurized air is directed via solenoid valves and PU fittings into membrane housing canisters filled with zeolite molecular sieves. These zeolite beds selectively adsorb nitrogen under pressure—a process known as Pressure Swing Adsorption (PSA)—allowing concentrated oxygen to pass through. Finally, a flow control valve regulates the output delivery of the generated oxygen for the user.