Based on the results of learning observations carried out at SMK Negeri 1 Sidoarjo, it is known that the learning process on programming and microcontroller materials still uses conventional methods and there is no trainer. As a result of this, the final assessment of learning obtained by students is not achieved according to the KKM determined by the SMK so that teachers do remedial learning materials. This research aims to produce trainers and modules that are suitable for use in terms of validity, practicality, and effectiveness. The study used the Research and Development method in the form of a one-shot case study with the subject of the research being students of class X TAV SMK Negeri 1 Sidoarjo. The results showed that the trainers level of validity was categorized as very valid with the percentage of trainers being 87%, the percentage of module validity being 90.45%, and the percentage of items in the module being 89.87%. The practicality of the trainers and modules is stated to be very practical and feasible to use with the results of the percentage of student response questionnaires being 84.5%. The effectiveness of the trainer and module is reviewed based on the final learning outcomes of students with a significance level of 0.05 so that the t count value is 3.297 and the t table value is 1.729 which if the t count value > t table has the conclusion that the average value of the final learning outcomes of students in class X TAV is more than the same as the KKM value set by the SMK. Based on the research conducted, it is concluded that the development of the IoT-based NodeMCU Esp32 Microcontroller Trainer Kit learning media is categorized as very feasible and well used as a new learning innovation in Programming, Microprocessor, and Microcontroller subjects at SMK Negeri 1 Sidoarjo.

Keywords: Microcontroller, Trainer Kit, NodeMCU Esp32, IoT.