The automated system for mixing liquids has a practical application in everyday life, it finds its application in the paint industry where it can be used to obtain the exact pigment. An automated liquid mixing system is beneficial because it removes the human factor and thus the error that humans can make. For the needs of the work, a functional mock-up of a device for precise mixing of liquids was created, and the application of a microcontroller, load cell or scale, and peristaltic pumps was demonstrated. The assembly works in such a way that we select the liquid and the amount of liquid using the rotary encoder. After confirming the selection, the dosing process of the selected liquids is started. The load cell reads the weight of the container and starts the pumps. During this time, the load cell reads the change in the weight of the container and stops the pump after a given amount. The state of the load cell is read again and this process is repeated until the given combination is obtained.