Humidity sensor by the humidity detection circuit and alarm circuit and other parts.
RP1 for humidity lower limit preset point, RP2 point for humidity limit preset.
When the soil moisture in the preset between upper and lower humidity, due to the soil resistance value between the probe of a and h within the prescribed scope, c point potential below the RPI sliding side potential (
The comparator in-phase input)
Comparator I showed high level, and at the red light;
RP2 potential is lower than the c point potential sliding end, displayed a high level, the comparator II green glow.
If soil humidity reaches or exceeds RP2 set the upper limit of humidity, ab probe resistance between smaller, so as to reduce the probe points, in-phase input voltage comparator II (
C point potential)
Below the comparator inverting potential (
RP2 potential sliding side)
, the comparator flip showed low level II, green light, at the same time SS8550II conduction buzzer sound, said soil humidity.
If the lower limit of soil drying to achieve or exceed RP1 set humidity, increase resistance between a and b probe, to probe the partial pressure increase higher than the voltage of the comparator in phase I,
RP1 potential sliding side)
, I showed low level comparator, red glow, at the same time SS8550I conduction buzzer sound, said the soil humidity is too small.
Buzzing device is designed to facilitate users to set alarm point, when set up key SP can be disconnected, by the next bit machine error.
Sensor probe is a and b by 160 mm long, 5 mm diameter stainless steel rod is two, and 55 mm.
Soil probe field debugging process is: (1) the RP1 sliding contact top to * and RP2 sliding contact to * bottom, make the red, green, all out;
(2), the adjustment of the soil moisture in two bowl for greenhouse nursery soil sample, a bowl for maximum humidity (
Which is suitable for greenhouse seedling * big soil humidity)
A bowl for the lower humidity (
Suitable for greenhouse seedling * low soil moisture)
Inserted the probe in the limit on soil, regulate the RP2, make green just light, buzzer just voice;
Inserted the probe in the limit of soil under again, adjust the RP1, just make the red light, buzzer just voice;
(3) the soil moisture detector alarm display terminal ALARM1, ALARM2 respectively connected to the lower machine P1 mouth, under a machine electrical reset P1 mouth for high level, when the soil humidity is too high or too low soil moisture detector ALARM1 or ALARM2 side showed low level, lower machine regularly scan P1 mouth level, and assign the corresponding status word, into the handler.
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