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Author: Smartweigh–Multihead Weighter
1 Introduction Dynamic trolley weighing means that the trolley passes through a weighing cabinet table with a certain total width at a certain rate. The net weight of each axle of the trolley is measured from the weighing cabinet table, and then the total weight of the trolley is accumulated. The whole weighing process is a strong real-time whole process, and the single-chip design must immediately collect the data information of each axis of the trolley and quickly measure its net weight. If the single-chip design speed is too slow or the programming design is unscientific, it will cause problems of reliability and credibility to the instrument panel.
The mobile phone software of many multi-functional instruments today adopts the front/background system design scheme. All program operation is an infinite loop system. The background operation loop system enables relative culverts to perform relative actual operations, and terminates system services to solve multi-threaded vicious events. . Such traditional programming design concepts have significant deficiencies. The entire program operation is a whole of organic chemistry. It is difficult to design and expand the real-time program operation. It is difficult to achieve a convenient and reasonable solution to malignant events with strict time regulations. use.
Transplanting the embedded operating system in the multi-function instrument can handle the above problems well, and make the software development work more and more standard and easy to detect, complete the programming of modular design and reduce the development progress. Naturally, RTOS itself must occupy a certain amount of resources. With the development trend of semiconductor technology, the characteristics of components continue to increase and the cost continues to decrease, which makes the cost of RTOS no longer critical. The automotive dynamic multihead weigher is the transplant of the embedded operating system, which improves the reliability and credibility of the system software in the specific application.
2 The overall scheme of the system The automotive dynamic multihead weigher is mainly composed of a data collection control module, a data processing method control module, a display information control module, a data communication control module, an external memory chip and an external watchdog 1, as shown in Figure 1. The data collection control module undertakes to enlarge and filter the net weight data signal detected by the weighing sensor, convert it into an analog signal and transmit it to the CPU; the CPU undertakes the communication with each external device and the analysis and solution of the net weight data signal, and will solve the problem The completed net weight data signal is sent to the display information control module and the communication control module; the display information control module is responsible for the display information of the net weight data signal: the communication control module is responsible for sending the net weight data signal to the host computer software; the external memory chip is stored in the instrument panel. Main parameters: The function keys are used to set and change the main parameters of the instrument panel; the external watchdog 1 is used to improve the anti-interference of the instrument panel and improve the reliability of the instrument panel. 3 Hardware Configuration Circuit Principles 3.1 Data Collection Control Module Because the multihead weigher table must be high precision, an external A/D converter is selected and CS5532 is used.
This component is a multi-channel analog/digital converter with extremely low noise released by British CirrusLogic, because it uses charge balance technology and extremely low noise program controller gain value chopper, stable and accurate measurement amplifier, The internal integration of enlargement and filter functions can achieve 24-bit pixel output results, and has the advantages of high dynamic range and flexible switching power supply options, making this component especially suitable for dynamic weighing. Its standard working voltage is produced by the professional standard working voltage component AD780. The power circuit is shown in Figure 2.
3.2 Microcontrollers and external memory chips Microcontrollers are the key to the system software, and the pros and cons of their characteristics immediately determine the accuracy of the weighing equipment.
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