Cleaner technologies that lessen the impact of industrial processes upon the environment have been increasily sought. In recent years the production of enzymes through solid fermentation processes has awoken renewed interest. However, there are few data in the literature depicting the automation of reactors for solid fermentation. The main parameters that are involved in the process, mainly pH, temperature, agitation and humidity of the medium have been shown difficult to be measured and controlled. The objective of this work was to automate a solid fermentation reactor through the development of a stirring system (mechanical shovel) and internal temperature control during fermentation. A mechanical shovel cutout was designed using AutoCAD software (Autodesk, USA), and molded through a lathe of the polypropylene material. For the automation of the reactor a Programmable Logic Controller (PLC) and a driver board containing the ULN2003 integrated circuit were used. CLP was programmed using the Clikedit-02 Software to control the rotation of the motor during fermentation and the process temperature was monitored by a JK type thermocouple. The fermentation took place in a 1000 mL Erlenmeyer flask using wheat bran substrate. The microorganism used was Aspergillus niger and the measure of enzymatic activity was carried out for tannase enzyme. The enzyme production process occurred during three days of fermentation at 32 °C. The effects of agitation on the fermentation medium were evaluated and compared with the control. It was observed that with the agitation system operating at 5 rpm twice a day, there was a decrease in the temperature of the solid fermentation medium of 1°C and the enzymatic activity increased approximately 2.5 times as compared to the reactor without automation of these parameters .