基于BHL2000实现字符灰度显示，本项目主要由三个模块构成：51单片机控制模块、BHL2000灰度调制模块、LED点阵显示模块。用AT89S51单片机产生16*16LED点阵的行扫描信号，并且由单片机控制BHL2000灰度调制芯片，输出调制后的驱动电流控制LED，实现LED点阵256级灰度显示。(Based on BHL2000, the character gray display is realized. This project is mainly composed of three modules: 51 MCU control module, BHL2000 gray modulation module and LED dot matrix display module. The line scanning signal of 16*16LED dot matrix is generated by AT89S51 MCU, and the BHL2000 gray modulation chip is controlled by single chip microcomputer. The drive current after modulation is output to control LED, and the 256 level gray display of LED dot matrix is realized.)