Design, integration, and production of a system for monitoring variables of refrigeration chambers. The main card is capable of communicating via Ethernet to a local network, which allows the user to transmit and receive data from sensors. Sensors such as current sensor, liquid presence, temperature, human presence, door opening, and power supply voltage sensing can be placed on the main card. The sensors are connected via RS485, creating a backbond network, which allows it to detect faults in any sensed variable, as well as detect the failure or absence of any sensor. It also has a relay for general use.