Area measuring instrument related sensors and design
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The measuring sensor is one of the key parts of the area measuring instrument. Its performance is directly related to the measuring accuracy. Optical sensors can be divided into two types: First, photoelectric sensors, which have the characteristics of small size, high speed, high cost, high installation requirements, suitable for relatively clean environment, and secondly, photosensitive sensors, which use fluorescent lamps as common light sources. The cost and the installation conditions and the use environment are relatively low. The interface circuit between the area measuring instrument and the measuring sensor can be selected according to the specific circumstances.
The area measuring instrument program adopts top-down design and module structure, including monitoring program, dynamic scanning display, printing, algorithm and other modules. T0 is a timed interruption mode, designing a perpetual calendar and clock program, sampling and important programs within the interrupt service routine. In order to ensure the brightness of the display, the programming process focuses on ensuring that the sampling and measuring modules work in order, and executes the display subroutine with as much time as possible, and calls the display subroutine for software delays. Such as the print program, keyboard shake, E2PROM write, etc. are called display subroutine methods. Setting or modifying important parameters requires password protection. Important parameters are stored in the E2PROM. Therefore, the operator's misoperation does not affect the normal operation of the measurement.