Introduce a method for measuring temperature by using msp430 single chip microcomputer

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This paper introduces a method of measuring temperature using msp430 single-chip microcomputer to replace the experimental method of relatively backward thermistor combined with ammeter in traditional teaching.
1 Temperature measurement section There are many temperature sensitive components for measuring temperature, such as thermocouples, thermistors, integrated temperature sensors, digital temperature sensors, and so on. This system uses a thermistor. The thermistor consists of a semiconductor ceramic working body that is very sensitive to temperature. Compared with the commonly used metal resistors, it has a large temperature coefficient of resistance and can achieve higher temperature resolution. Thermistors made of different materials are suitable for different temperature measurement ranges. For example, the thermistors made of CuO and MnO2 are suitable for -70~120 °C, suitable for measuring body temperature. The temperature is the analog quantity, and the measured analog quantity is converted into a digital quantity for processing by the single chip microcomputer. In order to save costs, analog-to-digital conversion can be achieved by slope A/D conversion. Slope A/D conversion is achieved by charging and discharging of an external capacitor. The circuit connection is shown in Figure 1.
/> Using the msp430 comparator (Comparator_A) and timer (Timer_A), you can measure the resistance of the thermistor. According to the correspondence between resistance and temperature, the temperature to be measured can be obtained, and A/D conversion can be realized. Connect CA0 of Comparator_A to external signal, CA1 is connected to internal reference voltage 0.25Vcc. Timer_A works in capture mode, capture on falling edge, capture CAOUT through CCI1B. First make P1.2 port output high level, charge capacitor C6 through Rref . When charging is completed, the voltage of CA0 terminal is higher than the voltage of CA1 terminal, CAOUT output 1. Read the count value of Timer_A t0, t0=TAR. Then let P1.2 port output low level, capacitor C6 discharge through Rref, when CA0 terminal voltage When falling to 0.25Vcc, the Comparator_A output is inverted, CAOUT outputs 0, Timer_A captures the falling edge through CCI1B, triggers the timer interrupt, reads the capture value CCR1, t1=CCR1.C6 discharges through Rref to 0.25Vcc time_ref=t1- T0. Then charge and discharge the thermistor Rsens, and also measure the time_sens when C6 is discharged through Rsens to 0.25Vcc. The resistance of the thermistor (Rsens) can be calculated by the following formula. <img height="79" width="480" src="http://i.bosscdn.com/blog/20/17/56/16322314809.png" alt=
2 Temperature display section
The MSP430F413 has a liquid crystal driving circuit and a display buffer. The corresponding segments on the LCD screen are displayed or disappeared by setting and resetting the bits in the memory, and the data obtained by the slope conversion is sent to the display memory, and can be displayed on the LCD screen. The measured temperature. The msp430 has four driving modes. Which driving method is selected depends on the number of liquid crystal segments to be driven and the arrangement of the liquid crystal panel pins and the internal electrodes of the liquid crystal panel. The LCD screen used in this system is the EDS812 liquid crystal display produced by Dalian Dongxian Electronics Co., Ltd. The display can display 3 digits with 24 pins, 1 common pin and 23 segment pins. Since the LCD screen has only one common pole, only the static driving method can be used. The MSP4 30 and EDS812 are connected according to the correspondence shown in FIG. 2 and Table 1, and data is written to the display memory to display the measured temperature.
/>3 Keyboard Control SectionThe keyboard is the input device of the man-machine dialogue. The system parameters can be set through the keyboard to control the system operation. The keyboard of the application system can use a non-deterministic keyboard and a determinant keyboard. The hardware circuit and execution software of the non-deterministic keyboard are relatively simple, consume less CPU resources, but are only suitable for the case of fewer buttons. The system has only one switch key and one temperature measurement button, which is suitable for non-deadline keyboards. This system uses a light touch button, which is realized by the switch state. In practical applications, the running speed is very fast relative to the speed of the operator's button, so it is necessary to consider the jitter problem before and after pressing the button. The system uses software delay to eliminate jitter, that is, when the system detects that a button is pressed, it will detect again if the button is pressed after 20 ms. If it is detected that the button is actually pressed, the function corresponding to the button is executed; if it is not detected that the button is pressed, the standby state is continued. 4 Conclusion With the above system, the temperature can be accurately measured. Different schools can formulate specific experimental steps in terms of hardware connection and software design according to specific teaching requirements. Through this experiment, students will initially grasp the application of integrated circuits in the teaching stage of the basic course. Compared with traditional experimental instruments, the experimental instruments consisting of this system apply more modern science and technology, and are closer to the actual equipment and equipment, so that students can better apply the knowledge learned by the school to practical work. </p> </div> </div> <div class="tech-detail-share"> <!-- Baidu Button BEGIN --> <div class="bdsharebuttonbox"> <a href="#" class ="bds_qzone" data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title="Share to Sina Wei Bo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> <span>Share to:</span> </ Div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName(

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