Fall armyworm (Spodoptera frugiperda J. E. Smith) has been considered one of the most devastating pests of maize crops (Zea mays L.). In Vietnam, the data on the occurrence of fall armyworm population in the field has been not comprehensively reported due to the lack of facilities. In this study, we introduced an automated fall armyworms (adult moths) counting system and a website providing real - time information about fall armyworm in Vietnam have been introduced. Particularly, a counting system has been designed based on the traditional pheromone traps. The sensors have been merged into the instrument to count the frequency of adult moths and together record the temperature and humidity data. In the greenhouse conditions, the specificity of pheromone - based traps and the accuracy of counting function have been exhibited. The whole data, including the real - time amount of trapped insects and environmental conditions, has beeh analyzed based on the machine - learning method, consequently, send to the Internet browser and applications. Taken together, our study could provide an effective insect counting tool for the forecast of the fall armyworms in Vietnam.