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. Previous:24V to 5V circuit diagram Next: Test board
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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. 
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. 
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