As shown in the figure, the bean sprouts automatic watering control circuit. The controller is composed of a step-down rectifier circuit, a power-off teller (IC3), a timing control circuit (IC1), and a temperature control circuit (IC2). The buck rectifier circuit provides a DC voltage of VDD=+7V for the entire controller.
The power-off teller is mainly controlled by a multi-vibrator composed of IC3 and R3, R4, C5, and the like. When the switch K1 is closed, when the mains fails, the relay J1 is released, the contact J1-1 is closed, the IC3 starts to vibrate due to the power, and the oscillation frequency is about 1000 Hz. The output signal drives the speaker to sound, and the owner is informed that the power is off.
The timing control circuit is composed of IC1 (555) and BG1, C2, R1, W1 and the like. Press the switch AN, the BG1 tube is turned on, the 555 is reset due to the high level of the 6 pin, and the low level of the 3 pin output is added to the reset end of the IC2 (555) to force the IC2 to reset. Corresponding C2 discharges through the emitter junction of BG1, R1 and W1. When C2 is discharged until the IC12 pin potential is lower than 1/3VDD, IC1 is set, and the 3 pin outputs high level, and the timing time is up. At the same time, IC2 is waiting for triggering due to the 4-pin quotient level.
For the temperature control trigger circuit composed of IC2 and W2, W3, W4, thermistor Rt, when the temperature rises, the Rt resistance value decreases, and the C pole potential of BG2 decreases correspondingly, when it falls to make the IC22 foot level lower than When 1/3VDD, 555 is set, and the high level of the 3-pin output causes the relay J2 to pull in, so that the voltage of the water valve of the watering machine is turned on, and the bean sprouts are watered and cooled. Thereafter, as the temperature decreases, the resistance of Rt increases, and the C-pole potential of BG2 rises. When the potential of 5556 is raised above 2/3VDD, IC2 is reset, and the low level of the 3-pin output causes relay J2 to be released. Thereby the watering machine is stopped from watering. This cycle allows the temperature to be controlled in an environment suitable for bean sprout growth.
The controller can automatically water water within 3 hours when the bean sprouts are used to produce the bean sprouts, and can automatically maintain the optimal temperature range for the growth of the bean sprouts.
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