Due to the butterfly effect in the chaotic system, each set of CRNGs has different initial values, so the output responses of the CRNGs of each set will be completely different. When we set up 10 sets of CRNGs with different initial values, we can get 20 random numbers and then according to the IEEE 754double-precision standard,each random floating-point value is represented with 64bits. Therefore, we can get 1280 random binary bits (2×10×64). At the same time, if necessary, we can also build more chaotic systems in the HT32F1765 microcontroller to get more random bits. By using 8×8 LED matrix, Figure 7 shows 256 random binary signals obtained from the proposed large-scale CRNG.