Module instructions

1. The humidity sensitive resistor module is most sensitive to ambient humidity and is generally used to detect the humidity of the surrounding environment.

2. When the ambient humidity reaches the set threshold, the DO port outputs a high level. When the ambient humidity exceeds the set threshold, the module D0 outputs a low level;

3. The small-plate digital output D0 can be directly connected to the single-chip microcomputer, and the high-low level is detected by the single-chip microcomputer, thereby detecting the humidity change of the environment;

4. The small board digital output DO can directly drive the store relay module, which can form a wet control switch;

5. The small board analog output AO can be connected with the AD module of the shop. Through AD conversion, the value of the environment humidity can be obtained more accurately;

Module test description

Use our 51 development board and humidity resistance module test

Wiring instructions:

Module VCC connected to development board VCC

Module GND is connected to the development board GND

Connect VCC and GND, the module power indicator will light up.

Place the module on the desktop, adjust the blue potentiometer on the board until the switch indicator on the board is on, then adjust it back slightly, let the switch indicator go off, and then try to make the ambient humidity become larger. At this time, the module switch indicator will light. . If the ambient humidity is lowered, the switch indicator will return to the off state. This phenomenon indicates that the ambient humidity can trigger the module, causing the switch indicator to illuminate.

In addition, the data comes with a 51 program to detect the high and low level of the digital interface D0 of the humidity sensitive resistor module.

The specific instructions are as follows:

wiring:

Module VCC connected to development board VCC

Module GND is connected to the development board GND

Module D0 is connected to the development board P0.1

Single chip microcomputer: STC89C52

Serial port send data baud rate: 9600

Phenomenon: When the ambient humidity exceeds the set threshold, the serial port continuously sends 01, and the switch indicator light is on;

The ambient humidity does not exceed the set threshold. The serial port does not send data, and the switch indicator is off.