Temperature detection: use DS18B20 digital temperature sensor to detect the real-time temperature of the environment.<br>Humidity detection: two temperature sensors respectively collect the dry and wet bulb temperature of indoor air, and transmit the collected temperature to the single chip microcomputer. The single-chip microcomputer processes these two data and requires the opening and closing of humidifier in combination with indoor humidity.<br>Liquid level detection: use bz0504 liquid level switch to detect the real-time liquid level of water tank. Output 0V when there is water and 5V when there is no water.<br>MCU control: our standard is at80s51, as the core component, to achieve the control of internal functions.<br>LCD: 1602 LCD module is used. Display real-time temperature and humidity.<br>Audible and visual alarm: when the detected liquid level is lower than the safety value, the buzzer rings and the LED light flashes, so that the user can add water to the water tank.<br>The relationship of each module is shown in figure 3-1-1:<br>
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