X X笙 This is a control unit that automatically repeats the set time switch every day in “monthsâ€, which is especially suitable for street lighting control at night. The principle of the intelligent street light control circuit is shown in the drawing.
The circuit is displayed by a 4-digit digital tube, and only the real-time time is displayed. However, you can set up and view the 4 digits of the year and the 4 digits of the date at any time to ensure that the date will not be caused by the year and month changes. The display time is in 24-hour format.
The main condition controlled by the month is the auxiliary condition of the photosensitive input. The light-sensitive function does not work when the date function is performing the control output normally. In this way, street lights can be automatically turned on in special climates (such as short dark weather before the storm).
January, February... November and December, each month can be set independently (every day of the month using the setting switch time of the current month) when to turn on the lights, when to turn off the lights. The relay contact output load is 3A/250V~ (resistive load). In fact, the circuit structure includes a calendar clock function (no need for week parameters), good power-down protection and accurate travel time accuracy. It also includes a photo-sensing input function to aid control as a special climate.
The MCU adopts the small-volume SMD package of Beijing Jiangshanshan HT48R30A-24SOP, the production base of Shengqun Semiconductor Co., Ltd. of Taiwan Province of China. This type of microcontroller is especially suitable for circuits with real-time clock control. When entering the battery protection, it can use the *RTC* function mode, so that the chip can continue to travel at 5jjlA current, and the frequency can be conveniently used. 32768HzM low-frequency crystal oscillator, this circuit uses a high-quality crystal with a frequency error of *5PPm to ensure that the cumulative error of travel time is no more than 15 seconds.
A brief introduction to the functions and usage methods is as follows.
How to adjust the date (Hint: In the following description, "X"
Represents any number).
First, the real-time date and clock inside the circuit must be adjusted. The current year, month, day, hour, and minute adjustment method is: use the *RQ* real-time adjustment button to set separately.
Press the *RQ* button for the first time, enter the person to set the year, the screen first shows 2003, indicating that it is now 2003, if you need to modify, use *SD* control setting button, *ZS* set button to add, Decrease the current number of years (the highest two cannot be modified because of the 99-year limit).
Press the *RQ* button for the second time to enter the month. The screen displays 1XX, indicating the XX number in January. Use the *SD* and *ZS* keys to add or subtract the current month.
Press the *RQ* button for the third time, enter the setting day, the screen displays XX01, indicating XX month 1, use *SD*, *ZS* button to add and subtract the current input H output - home real-time adjustment: RQ control Set: SD number: ZS days.
Press the *RQ* button for the fourth time, enter the person to set the hour, the screen displays OXX, which means 0: XX, use the *SD*, *ZS* keys to add or subtract the current hours.
Press the *RQ* button for the fifth time, enter the minute setting, the screen displays XXOO, which means XX 00 minutes, use the *SD*, *ZS* keys to add or subtract the current score.
Press the *R (* button for the sixth time to exit the current date setting and return to the normal travel time state. The screen display is for example 11:35. After the year, month, day, hour, and minute are adjusted, as long as the power failure protection battery does not expire, There is no need to make any adjustments, because it will automatically distinguish between the size and the month, and automatically distinguish between the year or the leap year. This will ensure that the automatic control is accurately synchronized with the current date, and it is foolproof! Avoid the problem of date errors.
A 60mAh power-down protection battery will be used in the circuit. When the external power supply of the circuit is stopped, the entire control system will still operate effectively, but the screen will not be displayed and no manual operation can be performed. When the battery is fully charged, it can ensure that the clock is reliably protected for more than one year after external power failure. Normally, the battery is floated and charged by the main power source (it is recommended to check the battery performance every 6 months).
Since the system can be operated without stopping, especially in the case of external power failure, if the power supply is suddenly restored, the system will immediately execute the control output. Therefore, if you need to perform some electrician work during the power outage, please be aware of the danger of sudden call. ! Reliable protection measures are required for this purpose.
In normal times, you can use the *RQ* button to view today's specific date (the "week" parameter is not arranged, because the week parameter is not needed here)...
The method of setting the time for "turning on the light" and "turning off the light" every month.
Use the *ZS* button to set the "on" and "off" lights used each month.
time.
Please note: When setting the month, due to the limited number of digits displayed on the screen, only one digital tube can be used to indicate the actual display month as shown in the attached table. It makes the base camp "SD* button to add and subtract the current score; according to the same setting method, you can set the switch light time from February to December.
After all 12 months have been set, press *ZS* to exit the setting.
Note: The setting must be completed in complete order. After setting a group to enter the next group setting, the previous set of data will be automatically valid... In this way, until December, the monthly “lights on†and The "light off" time is set; you don't have to worry about the midnight issue of the day, because the street lights are off in the morning and open in the evening.
If the operation button is stopped midway when the setting is not completed, the system waits for 10~15 seconds, and will automatically exit the setting and return to the normal running state.
The setting operation method of data modification.
In use, the user may need to modify a certain time. In this case, you should press the above operation to first display the “InXX†display of “Monthâ€, you can modify the “lighting†time of the month, or continue to call up* IFXX ", modify the next set of settings for the month, the data modified this time will be automatically valid, then, wait 10 to 15 seconds, automatically exit the modification, return to normal operation.
Additional photo detection input function.
The photoresistor signal is input to the first leg of the HT48R30A MCU, which is active high. The on and off judgment time is 1 minute. When the system is in the non-control output time zone, if there is a special situation, it needs to be output, for example, the weather is "dark and dark"
Temporary output may be required, so a “photosensitive†input is added, which is valid only in the time zone where the system is not output, and the judgment time is more than one minute in succession to avoid the influence of lightning or other light sources.
If you need to use this "photosensitive" function, you only need to place the "photosensitive" component in a place that is not easily affected by the artificial light source, and placed under the natural weather light source, and also need to prevent the attack of foreign objects such as rain.
If you do not need to use this function, you only need to display the interface connecting the photosensitive elements to the straight month without using hexadecimal.
This type of display is common knowledge for people who have studied digital circuits or computer hexadecimal knowledge.
To add or subtract the current hours; the screen displays: lnXX means to set the hour of the "light on" time in January (note that the screen colon is not lit). Use *RQ*, *SU* keys to add and subtract the current hours; press the *ZS* button a second time, the screen displays In:XX to set the minute of the "light on" time in January (note that the screen is light) . Use *RQ*, *SD* keys to add and subtract the current score; press the *ZS* button for the third time, the screen displays: 1FXX means to set the hour of the "light off" time in January (note that the screen colon is not lit). Use *RQ*, *SD* keys to add and subtract the current hours; press the *ZS* key for the fourth time, the screen displays: 1F: XX means to set the minute of the January off time (note that the screen is light). With *RQ*, (resistive) relay contact output, since the final output of street lamp control is often a load with a large control power, the output starter should be connected to a high-power AC contactor, and then contact with AC. To drive the street light load.
Note: The whole circuit is packaged in a standard instrument plastic case, and the maximum size of the face frame is only 48x96mm2. For more information and this circuit print editor's note: The mail order advertisements in conjunction with this article are as follows.
%(100061) The electronic department of Jielong Company, No. 1 Xizhao Temple Middle Street, Guangqumen, Beijing, is available for the finished product of this article, each 98 yuan. Customer purchase*
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