In this study, we investigate the visible light communication technology under ultralow illumination to satisfy the wide coverage and multiconnection requirements associated with the internet of things. A light-emitting diode (LED) is used to transmit the visible light signals in the infrared protocol format. The calculations denote that the human eye can not notice flicker when its modulation depth is less than 0.625%. Further, an indoor visible light communication scene (30 m×2.1 m×2.6 m) is simulated by considering a Lambertian source radiation model; the signal coverage become 616 m ² when a 9.7 W LED illumination lamp with a 20×12 array is used as the transmitting device and the modulation depth is 0.46%. Subsequently, a visible light-based intelligent home system is developed in the laboratory to estimate the farthest distance at which a remotely controlled robot can respond to the signal with 100% accuracy. The relative error between the experimental results obtained at 14.3 m and the simulation results obtained at 14 m is 2%.