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The air sensor uses MQ-135 gas sensor, which can detect air very sensitively. The 3P sensor connection line can be directly plugged into the Arduino uno controller for easy programming. Combined with the buzzer module and relay module, products such as vacuum air leak alarms can be made to keep the device in a vacuum state.

This module is a fan module that can be used with other small modules for some interesting applications (electric fans, heat dissipation, propellers). Not only can it be switched through the digital port of Arduino, but the speed can also be adjusted through PWM. Usually the port current of Arduino is too weak to drive the motor, so we integrate the driver and motor on this module and directly connect it to the main control board. Helped save a lot of trouble. Our common fire extinguishing trolleys can be installed with this fan for operation.

The liquefied gas sensor uses MQ-5 gas sensor, which can detect alcohol very sensitively. The 3P sensor connection line can be directly plugged into the Arduino uno controller for easy programming. Combined with the buzzer module and relay module, you can make products such as liquefied gas leak alarms. It is an ideal sensor to make indoor air meet environmental protection standards.

This module is a sound recording and playback module. It uses ISD1820 as the recording chip. It is easy to use and has high-quality, natural voice restoration. It can record for 10 seconds, with loop playback, jog playback, and single-pass playback functions.

4*4 matrix keys, also known as column keyboard, use 4 I/O lines as row lines and 4 I/O lines as column lines to form a keyboard. A button is set at each intersection of the row line and the column line, so that there are 4*4 keyboard keys. This row-column keyboard structure can effectively improve the I/O port utilization of the microcontroller system.

The XY sensor module uses the high-quality metal rocker potentiometer on the PS2 game controller. The module has two analog outputs, and the output values correspond to the (X, Y) dual-axis offsets. The module integrates a power indicator light that can display the working status; the coordinate indicator is clear, concise, and accurately positioned. It can be used to easily control the movement of objects in the two-dimensional space, so it can be programmed through the controller to complete various remote control functions.

The flame sensor can detect flames or light sources with wavelengths in the range of 760 nanometers to 1100 nanometers. The flame detection distance of a lighter is between 80cm. The larger the flame, the farther the distance. The detection angle is about 60 degrees, which is particularly sensitive to the flame spectrum; it can be passed Adjust the potentiometer on the PCB to adjust the sensitivity.

The voltage sensor adopts a voltage-divided detection method, and the maximum output voltage cannot exceed 25V. The module integrates a power indicator light to display the working status; as the input voltage changes, the output signal analog quantity changes accordingly and is connected to the controller. By judging the analog quantity of the signal pin, the voltage can be detected.

This temperature sensor uses the LM35 temperature sensor, and its output voltage is in Celsius temperature scale. Its basic working principle: the temperature sensor circuit converts the measured temperature signal into a voltage signal and outputs it to the signal amplification circuit. The voltage signal corresponding to the temperature value is amplified and output to the A/D conversion circuit, which converts the voltage signal into a digital signal and sends it to the A/D conversion circuit. To the single-chip computer system, the single-chip computer system processes the digital quantity according to the display needs, and then sends it to the temperature display system for display.

This sensor uses the 3144 Hall switch integrated circuit, which is a magnetic sensitive circuit with the characteristics of small size, high sensitivity and fast response.
Integrated power indicator light and working status indicator light can clearly check the working status of the sensor. When the sensor senses a magnetic field, the signal output bit outputs a low level and lights up the indicator light; when there is no magnetic field, the signal output bit outputs a high level.

This smoke sensor uses MQ-2 type gas sensor, which can sensitively detect smoke and methane gas in the air. The 3P sensor connection line can be directly plugged into the Arduino uno controller for easy use. Combining the buzzer module and relay module, you can make smoke alarms, methane leak alarms, automatic smoke exhaust fans and other products to make indoor air The ideal sensor to meet environmental standards.

The Bluetooth sensor is a master-slave Bluetooth serial port module. When the Bluetooth device is successfully paired and connected, the Bluetooth internal communication protocol can be ignored and Bluetooth is used directly as the serial port. When a connection is established, the two devices share a channel, that is, the same serial port. One device sends data to the channel, and the other device can receive the data in the channel. Of course, there are certain conditions for establishing this kind of channel connection, which is to set the AT mode of Bluetooth to enable pairing connection.

The sensor uses the DS1302 chip, which contains a real-time clock/calendar and 31 bytes of static RAM, and communicates with the microcontroller through a serial interface. The real-time clock/calendar circuit provides seconds, minutes, hours, days, weeks, months, and years of information, and the number of days in each month and leap year can be automatically adjusted. Clock operation can be determined by AM/PM indication in 24 or 12 hour format. It has the characteristics of low power consumption and high precision.

This sensor uses large-size LEDs and can be connected to a controller to simulate traffic light operation.

The water level sensor is an easy-to-use, cost-effective water level/water droplet recognition detection sensor. It measures the size of the water droplets/water volume through a series of exposed parallel wire traces to determine the water level. Easily complete the conversion of water volume into analog signals to achieve the effect of water level alarm.