Design of intelligent wireless sensor solenoid valve control circuit

　　Solenoid valve control circuit : In order to intelligently realize the function of monitoring the gas concentration in the mine anytime and anywhere, the main control chip CC2430 adopts fuzzy PID control, outputs the required waveform through P0_1, and controls the opening and closing of the solenoid valve through the following circuit. When the solenoid valve is disconnected, the pump stops working; when the solenoid valve is closed, the pump starts working to discharge the gas in the mine until the gas concentration in the mine is within the safe production range. The solenoid valve control circuit is shown in Figure 5.

　　Figure 5 Solenoid valve control circuit

　　When the output of P0_1 is high, the transistor is in a saturated state, the field effect transistor IRF9530 acts as an electronic switch, the IRF9530 adds a driving voltage, the drain obtains an amplified current, and the solenoid valve is closed; when the output of P0_1 is low, the base voltage of the transistor is 0, making the transistor in a cut-off state, the field effect transistor does not meet the conduction conditions, and is also in a cut-off state, and the solenoid valve is disconnected.