Towards constructing one-bit binary adder in excitable chemical medium

► Light-sensitive BZ medium near a sub-excitable level realizes a wide variety of logical operations when weakly-constrained by illumination-induced geometrical architectures. ► Two types of Boolean logic gates are designed, both gates have two inputs and two outputs. ► The gates are assembled into a one-bit half-adder. ► The full functionality of the adder is illustrated using a two-variable Oregonator model. ► In laboratory experiments we implemented the interaction gates that make up the one-bit half-adder scheme.