In the first mock exam, the compone

In the first mock exam, the components needed for system design are assembled, including the soldering iron, solder and so on. The corresponding circuit diagram is found, and the corresponding devices are located for welding. When the welding module is installed, the circuit module is welded. The power supply is started from the power source and the microcontroller circuit is carried out one by one. Each module must be tested to ensure that the power supply is not short circuited. There is no tin slag to prevent signal short circuit. Only when the measurement is normal, can the test be powered on. Any short circuit or poor contact may burn the circuit. It is necessary to test step by step. The common abnormal phenomena shall be checked clearly. The components with positive and negative pole requirements shall not be connected reversely, or the components will be burned. After the physical assembly and welding is completed, the power on verification can be carried out. When the power is turned on, confirm whether the power supply is normal again. After the power supply is normal, start the power supply, the system led works, and the power indicator light is on. At this time, you can burn the code to the single chip microcomputer. After the code is burned, observe whether the system status is correct, verify the system function, and then carry out the verification The verification of other functions shall be carried out according to the functional requirements of the system. After all functions are verified, the physical power on test is completed. To test the display module, the key problem in this step is whether the pins of magnetic field data collection correspond to the program one by one. In addition, there are the contrast and backlight settings of the display screen. If they are not set properly, they cannot be displayed normally. After debugging, the display function of the system is normal.