1. Introduction of MSP430FW42x MCU The MSP430FW42x series of microcontrollers is TI's newly developed dedicated MCU chip for electronic flow and rotary motion detection. It combines ultra-low power MCU, rotary scanning interface (SCAN IF) and liquid crystal display LCD driver modules. The device's ultra-low power structure and flow detection module not only extends battery life, but also improves instrument accuracy and performance. Typical applications for the MSP430FW42x include thermal meters, hot and cold water meters, gas meters and industrial flow meters, wind meters, and other rotary inspection applications. 2. Principle of flow measurement 2.1 Basic principles A mechanical device consisting of an impeller or a helical gear converts fluid flow into rotation, which enables measurement of fluid flow. The rotation of the impeller can be detected by placing an inductor in a resonant tank above the impeller, and half of the impeller is coated with copper or other damped metal. The damping coefficient of the resonant circuit is determined by the position of the inductor above the impeller. When the inductance is in the region a, the damping coefficient of the loop is higher than when the inductor is located in the region b. Measurement of the rotation can be achieved by measuring the different damping coefficients of the resonant tank. Figure 1 is a schematic diagram of the measurement principle. 2.2 Oscillation test method Figure 2 shows the oscillation waveforms of two sensors in different regions. The MSP430FW42x uses the oscillation test method to convert different attenuation amplitudes into digital signals for measurement. This method expresses the damping coefficient of the sensor 1 in FIG. 2 as L, and the damping coefficient of the sensor 2 as H. 2.3 Signal Processing As the impeller rotates, the signals of sensor 1 and sensor 2 change continuously. Figure 3 shows the state changes of the two sensors. If the previous state and the new state are known, the direction of the rotation can be derived at the same time. Count up: change from state d to state a; count down: change from state b to state a. 3. Non-magnetic water meter designed with MSP430FW427 The MSP430FW427 design water meter has a very simple circuit structure, and the flow measurement part is completed by the MSP430FW427 built-in SCAN IF module. Figure 4 is a block diagram of the non-magnetic water meter system designed with MSP430FW427. FC Fast Connector is used for field-assembled optical Fiber Connector, widely used in fiber to the home (FTTH) access optical networks.FC fast connector is not only for single-mode or multimode fiber but also choose to 900 microns, 3 mm and the introduction of cable 8 font type .FC fast connector is quick and easy terminations of fibers in the field. Installation process of fc fast connector takes about two minutes and does not require any adhesive and curing process.Fiber preparation tools of FC fast connector: a fiber stripping tool, wipes and a fiber cleaver.FC fast connector are widely used in FTTx, Connecting up Renovation of Computer/controlling Room applications. Foclink,a reliable supplier of FC fast connector is always beside u 7*24. FC Fast Connector FC Fast Connector,FC Apc Fast Connector,Fast Connector FC Foclink Co., Ltd , https://www.scfiberpigtail.com
