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Digital display thermometer circuit

2016-12-09 01:15  
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Digital display thermometer circuit
Thecapacitive moisture sensor KHY10 canform the humidity meter whichis displayed by double-digit percentages of LCD display. The pulse width of single state trigger produced by 1kHz quote swings device depends on the sensor elements' capacitance. In zero humidity, single state trigger's pulse width isequal to oscillating wave's half cycle. These two pulses are added to the XOR gate to form the difference pulse signal, and according to the difference between the pulse width, the 200KHz signal is added the AND gate. If there is differential pulse, the output is only pulses.