Warehouse humidity detection and automatic ventilation and exhaust device circuit (MS01-A)

As shown in the figure, the circuit is composed of a precision time base oscillator, D flip-flop, temperature detection circuit, comparison circuit, relay control exhaust circuit, language warning circuit and AC step-down rectifier circuit. BC uses the crystal used in quartz watches, and its natural frequency is 32768Hz; K1 uses JZC-22F; C6 and C7 use CD11-16V electrolytic capacitors; C3, C4 and C5 use CL11-63V polyester film capacitors; R10 uses RJ- 2W-820kΩ, RP1 uses a WH5 synthetic film potentiometer, and the remaining resistors use RT-1/8W carbon film capacitors; C8 uses CBB-400V-0.75μF; VC uses a 1A/400V full-bridge rectifier module or four 1N4004 forms a bridge rectifier; B uses a 0.25W (8Ω) electric speaker.