Demand for mobile data transfer has driven developing technologies, including optical wirelesscommunications, such as visible light communication (VLC). The high demand has contributed much higher power consumption, which means an increase in carbon emission as well. VLC is an alternative solution for green communication because of its potential applications for both lighting and data transfer simultaneously. In this paper, we study a low-cost VLC system, which consists of two sides, to understanding its performance for digital data transmission. The first part of the transmitting end consists of a microcontroller and an LED. The second part of the receiving end consists of a photodiode and a microcontroller. This research considers OOK modulation, a darkroom to avoid noise from other light sources, and three variables of wavelength spectrums, clock rates, and distances. Parameter observation of bit-error-rate or BER shows that the average BER of LED in white color has smaller BER than red, green, and blue LED, which 0.377, 0.412, 0.387, and 0.387, respectively. From this research, we obtain an insight into sufficient received power and component characteristics that are necessary for developing effectively VLC systems.