Visible light communication (VLC) uses visible light as a communication medium. Some considerations are required to build a VLC system, including the physical- and the MAC-layer. The modulation technique is one part of the physical-layer that has substantial role because it can determine the performance of VLC systems (e.g. transfer speed, dimming, flickering, BER). The modulation technique applied to VLC system must support fast access by utilizing the available bandwidth along with low BER value, then it should not cause flickering or dimming effects that can influence the LED function as a lighting device. In this study, the VLC system is designed based on 2-PWM modulation (variance of PWM). The designed system includes transmitter and receiver with STM32F4 Microcontroller as DSP. Evaluation is done by comparing bitrate and BER between 1-PWM with 2-PWM in which the data transfer rate of 2-PWM is higher than 1-PWM, but its optical channel distance is shorter than 1-PWM modulation.