The development of science and technology plays a vital role in helping human work. Technology is overgrowing in supporting all aspects of human life. One of them is the technology that is developing in the security sector. Therefore technology is needed that can reduce and prevent crime. This study examines and discusses the security technology developed in the livestock sector. Cattle farming is the object of this study due to the high crime level in cases of livestock theft, so vigilance and guarantees are needed for the safety of livestock in cages. The technology developed to improve the safety of the cowshed is security technology using the ultrasonic sensor srf-05, which will detect people/objects within a predetermined distance. The research method used is qualitative and quantitative methods. Each distance limitation is carried out in several trials so that the correct analysis results can be obtained. From several trials that have been carried out using different distance parameters, namely (30 cm, 60cm, 100cm, 200cm, 300cm), the results showed that the tool worked well using the srf-05 sensor with effective detection at a distance of = 60 cm obtained from the measurement between the height of the cowshed door - the average height of a human
