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Combination lock circuit include: the keyboard input, and password changing, password detection, unlock circuit, executive circuit, alarm circuit, keyboard input frequency lock circuit. Jimmy Choo Outlet 2 circuit function unit designs 2.1 unlock institutions Through the microcontroller to unlock actuators, circuit drive fits the absorption, thereby electromagnetic lock reached unlock purpose. Its principle as shown in figure 2-1 below. FIG. 3-1 combination lock unlock institutions schemes When the password of user input correct and is stipulated in the time (ordinary users requirements within in the right Jimmy Choo Outlet Boots password 12s, administrator requirements in 5s input the correct password) input words, SCM and output signal, to open the door lock, then drive drive circuit, to open the door of the electromagnetic lock purpose. Its practical circuit as shown in figure 2-2 shows.
Circuit drive and lockpicking two levels of composition. D5, R1, T10 by driving circuit, including T10 composed Jimmy Choo Outlet Heels of small power can choose to ordinary 9014, 9018 are like transistor can meet the requirements. D5 as unlocked tip; D6, C24, T11 by composed. Among them is to eliminate C24 D6, electromagnetic lock possible reverse high voltage and possible electromagnetic interference. T11 can choose the transistor like power in the selection of 8050, electromagnetic lock on depends. But suck Jimmy Choo Outlet Sandals by certain force should be enough and the surplus. In this design, based on the principle of saving material, to temporarily use leds instead of electromagnetic lock, luminous GuanLiang, said unlock; Destroy, says that there is no lock. FIG. 3-2 combination lock unlock institutions diagram 2.2 buttons circuit design Every single level (lines) and vertical line (column line) junction not Jimmy Choo Wallets interlinked, but rather through a button to connectivity, using the determinant matrix structure need only N lines and M bar column line, can form a N x M a button keyboard. In this determinant matrix of the keyboard coding keyboard SCM system, keyboard processing program first execution confirmation whether buttons and waiting for the procedures section keys pressed. When confirmed Jimmy Choo Outlet Bags after keys pressed, the next step will be to identify which a button press.
The identification of key commonly there are two ways: one kind is commonly used.scanning inquires the law; Another kind is fast line inversion. First identify the keyboard or key press, a single-chip microcomputer I/O port to the keyboard, and then send the scanning words read lines Jimmy Choo Outlet Handbags state to judgment. The method is: to lines output full scan 00H, put all fathers word, the low level line will be listed line level and read in A state of accumulator. If there are keys pressed, there will be a root lines level is pulled to low level so that not all lines for 1. 2.3 display circuit design Jimmy Choo Outlet Heels This system design show circuit is to give users to tip and setting. Considering the mouth to save the single-chip microcomputer system we show resources, by the way, serial display using only MCU two serial port, can complete MCU display, display circuit circuit principle diagram shown as shown in figure 2-5. Circuit setting: when the program is testing within 5