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如图所示，当土壤湿度传感器探头悬空时，三极管基极处于开路状态，三极管截
如图所示，当土壤湿度传感器探头悬空时，三极管基极处于开路状态，三极管截止输出为0；当插入土壤中时由于土壤中水分含量不同，土壤的电阻值就不同，三极管的基极就提供了大小变化的导通电流，三极管集电极到发射极的导通电流受到基极控制，经过发射极的下拉电阻后转换成电压。
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As shown in the figure, when the soil moisture sensor probe is suspended in the air, the base of the triode is open, and the output of the triode is 0; when it is inserted into the soil, the resistance value of the soil is different due to the different moisture content in the soil, and the base of the triode is Provides a variable conduction current, the conduction current from the collector to the emitter of the triode is controlled by the base, and is converted into a voltage after the pull-down resistor of the emitter.
正在翻译中..
As shown in the figure, when the soil moisture sensor probe is suspended, the catheter base is in an open state, the tripole cut-off output is 0, when inserted into the soil due to different moisture content in the soil, the resistance value of the soil is different, the base of the tripole provides a change in size of the on current, the catheter set electrode to the transmitter of the conduction current is controlled by the base, after the pull-down resistance of the transmitter converted into voltage.
正在翻译中..
As shown in the figure, when the probe of the soil moisture sensor is suspended, the base of the triode is in the open circuit state, and the cut-off output of the triode is 0; when it is inserted into the soil, due to the different moisture content in the soil, the resistance value of the soil is different, and the base of the triode provides the conduction current of varying size, and the conduction current from the collector to the emitter of the triode is controlled by the base and passes through the emitter Pull down the resistance and convert it into voltage.<br>
正在翻译中..
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