Abstract : In real life, people cannot live without plantation shutters online, but nowadays people mostly use manual plantation shutters online, which is not only laborious but also very inhumane. The smart plantation shutters online designed in this article can solve these problems. Taking AT89C51 microcontroller as the core control, photosensitive and temperature sensors collect data and provide signals, and stepper motor performs control. The design uses a single-chip microcomputer to combine many control methods of semi-automatic control, automatic control and manual control to intelligently control the opening and closing of plantation shutters online.
Key words: AT89C51; stepping motor; automatic control; temperature sensor; light-by-light plantation shutters online; remote control
Technology has made people’s lives more diverse, and people can use more intelligent systems instead of doing it themselves. People’s lives need plantation shutters online, which can protect people’s privacy. The automatic plantation shutters online system can not only save the trouble of closing the plantation shutters online by yourself, but also can be widely used in various occasions. However, my country’s intelligent technology is in the initial stage of development, far less than that of European and American countries, but it is not difficult to see the potential of this industry. This system can not only make people’s lives more comfortable and comfortable, but also promote industrial development. Smart plantation shutters online technology is a high-end frontier industry. Now European and American countries have widely used this technology in people’s livelihood, so it is necessary for my country to increase its promotion efforts.
The system includes AT89C51 single-chip microcomputer, stepper motor, photosensitive sensor and temperature sensor. The single-chip microcomputer is the core control. The photosensitive and temperature sensors collect information, and then transmit it to the single-chip microcomputer through the serial port. After processing, the single-chip microcomputer sends a pulse signal to the stepper motor. The stepper motor rotates forward (reversely), and finally realizes the complete opening (complete closing) of the blades.
The hardware design includes microcontroller core circuit, signal conditioning circuit, stepper motor control circuit, keyboard/display interface circuit, A/D conversion circuit, detection circuit and other circuit modules. The peripheral circuit of the chip provides the 5 V required by various modules. Power and clock modules. After the analog signal, adjust the amplification and wait for the A/D conversion to output the digital signal to the controller. Design objects.
Through configuration, it can communicate with the serial port on the microcontroller and use WiFi to transmit data. And through the UART interface, Arduino can send AT commands to control its function. ESP8266 has two working modes, namely Station mode and AP mode. The Station mode is used to connect to the wireless router for work; the AP mode uses the ESP8266 as a hotspot to connect the mobile phone to the corresponding device (or wireless router) to work. This paper adopts AP mode to achieve main remote transmission function.
Hardware debugging uses the development system, basic testing instruments (multimeters, oscilloscopes), etc. to check the faults of the system hardware. Hardware debugging is divided into two steps: static debugging and dynamic debugging. (1) Static debugging The static debugging steps are as follows: ①Eye detection: Check whether various external components or circuits are faulty; ②Multimeter detection: Check the connection points in question in step ① with a multimeter, and then check the connection between each power supply and ground wire. ③Power-on detection: Power on the circuit board until all hardware power supplies reach the required value; ④Operation detection: Check the system after connecting the whole system. (2) Dynamic testing Dynamic debugging is a kind of hardware detection, which is used to find and eliminate the internal faults and device connection errors of the equipment in the hardware of the user system when the user system is working.
The circuit consists of signal amplification and comparison circuit, conversion circuit, sensor control circuit, 89C51 single-chip microcomputer, stepping motor, timing circuit, display circuit and so on. When the system is not connected to the short-circuit cap, the plantation shutters online can be opened and closed by timing, and the 4 keys K1, K2, K3, K4 are respectively connected to P1.3, P1.4, P1.5, and P1.6 of the microcontroller. K1 key can be used to set date and time, press K1 to adjust year, month, day, hour and minute in turn, the adjusted part will become “**” state, you can press K2 (+), K3 (-) to adjust Adjustment data, K4 is used to set the time of opening and closing, press 5 times to complete the adjustment and display normally. When the system is connected to the shorting cap, the plantation shutters online at this time is controlled by the sensor. The comparison circuit composed of the operational amplifier is the main component circuit of the sensor control circuit. There are two resistors at the non-inverting input end, their function is to divide the voltage, and the voltage value is the reference voltage. The signal collected by the temperature sensor and photoresistor is supplied to the inverting input. The photoresistor can be changed by the change of the light intensity, and the temperature sensor can convert the signal according to the temperature.
Get the value of the voltage at the inverting input. Compare the two sets of voltage values obtained, and then send the compared signals to the P3.5 and P3.6 interfaces of the AT89C51 microcontroller through A/D conversion. After being processed by the MCU, the output command is used to control the forward or reverse rotation of the motor, so as to control the closing of the blade by light and temperature. The control of the speed of the stepping motor is realized by the timer working in the interrupt mode. Timer timer interrupts generate a periodic pulse train that does not consume CPU time. The CPU can only issue a command to make the stepper motor turn one step when an interrupt occurs, so other things can be done during the non-interrupt time. According to the conversion of the excitation state of the stepping motor, the required output state can be obtained through the table look-up method, and its binary code form is stored in the internal memory of the single-chip microcomputer in turn; then the state word in the address is sequentially taken out in the forward or reverse order. , and sent to STC12C4052AD to output each excitation state, thus realizing the function of ring distributor.
This paper mainly introduces the hardware design and software design in the intelligent plantation shutters online control system. In the overall scheme, the photosensitive and temperature sensors are used to collect signals to make the data more accurate, the stepper motor is used as the actuator to make the control easier, and the AT89C51 single-chip microcomputer is used as the control mechanism. The whole circuit structure is simple and clear, and the measured The parameters are sent to mobile terminals such as smart phones, which are convenient for data storage and query, and the display mode can be diversified and personalized with the interface design and function design.
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