Carrageenan is natural polysaccharide derived from Baltic seaweed Furcellaria lumbricalis. This natural polysaccharide has wide application in sensor industry. Such products as the humidity sensors, stretch sensors are already proposed with various solutions. Since the abundance of these seawead on the coast poses ecological problems, it is necessary to carefully evaluate the circumstances of the more active use of this product of natural origin in production. Our scientific group conducted research on the production of a stretch sensor from carrageenan collected on the shores of Riga. Carrageenan itself is electrically conductive until it has some moisture in its structure. The formed carrageenan biopolymer film was enriched with various metal oxides. The most suitable and cheap additive is iron oxides. We chose Fe2O3 oxide because of its unique properties already confirmed in previous studies. The performed stretching tests of the product confirmed the possibility of using this carrageenan, which is not fully chemically purified, as the main material of the stretching sensor after protecting it from moisture loss with an additional layer of ecologically friendly polymer. Such a sensor can be used as a disposable product suitable for recording small deformations. The advantage of such a sensor is sustainability, since carrageenan is environmentally friendly and non-toxic in contact with the human body. The resulting characteristic of the force sensor is close to quadratic. Such a sensor can be used for loads up to 1 N per square centimeter unit. Elaborated carrageenan-based sensor has quadratic dependence of resistance on applied force.