【摘要】 主要描述了利用LM339 电压比较器制作蓄水池水位计的原理和经验。该设计根据水位高低, 进行信号处理, 控制多个电压比较器输入端的电位, 使其输出端有相应的变化, 从而驱动不同的LED发光管, 达到显示水位高低的效果更多还原

【Abstract】 The principle and experiences in the fabrication of water level measuring meter simply by using LM339 voltage comparator for reservoir is presented. The main idea is that the input voltages of multi voltage comparator vary with the measured water level, and the output voltage, function of the input can drive LEDs to display true water level.更多还原