本文的实际工作背景是机器人玩具控制器设计的一部分，介绍了磁阻传感器的电路设计以及工作原理。
The work of this paper is is part of the design of robot toy controller system, the paper presents the principle and design of magnetic sensor in Direction control.
论述了利用变频器、压力传感器、可编程序控制器以及自制的控制器组成的改进型消防恒压供水控制系统。
This thesis discusses improved water supply control system with constant pressure in the fire fighting that is composed of transducer, pressure sensor, PLC as well as homemade controller.
重点阐述了系统中称重传感器，称重控制器的原理和特点，以及自动分装的控制过程。
The priciplies. the characters of weighing sensor and weighing controller and automatic packing controlling process are described.
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