Fig. 1. Block diagram of real-time bi-directional visible light communication system

Fig. 2. (a) Forward voltammetry curve of LED;(b) reverse voltammetry curve of LED

Fig. 3. Spectrum of the LED as the light and the photodetector

Fig. 4. (a) Schematic of transmitter module; (b) Schematic of receiver module

Fig. 5. Physical map of transmitter and receiver module circuit

Fig. 6. Flow chart of communication protocol

Fig. 7. Experiment platform of real-time bi-directional visible light communication system

Fig. 8. Transmitter waveforms of clock frequencies of (a) 1, (b) 20, (c) 40 MHz; (d) frequency response of transmitter

Fig. 9. Receiver waveforms of clock frequencies of (a) 1, (b) 5, (c) 10 MHz; (d) frequency response of receiver

Fig. 10. Bit error rate curve of real-time bi-directional visible light communication system at a distance of 2 m

Fig. 11. Layout illustration of LED

Fig. 12. Bit error rate versus rotation angle