Temperature measurement systems are used in a wide range of applications, covering all aspects of the industry and occupying important positions in a variety of fields. Starting from lowering development cost, expanding application range, stability and reliability of system operation, designing a temperature measurement device with PT100 platinum thermal resistance as temperature signal acquisition component, EW78E58 single-chip microcomputer as control core and OCMJ4@8C liquid crystal display as display device system. Voltage amplification and A/D conversion interface circuit The voltage output from the PT100 platinum RTD is very small. If it is directly connected to the A/D converter, the conversion data has a large deviation. Therefore, in this design, the voltage output from the PT100 platinum RTD is amplified 10 times and then the voltage follower. Connected, then A / D conversion, this will get a better conversion effect, as shown in Figure 2. The precision amplifier INA118 and the voltage reference chip MC1403 form an amplifier circuit, VIN+ is the voltage value outputted from one end of the PT100 platinum thermistor; WIN- is the voltage value output by the reference voltage source MC1403; VOUT is the amplified output voltage value. The MC14433 chip A/D converter (equivalent to 11-bit binary number) with double integral type 3 (1/2) bits is selected. The MC14433 adopts dynamic scanning BCD code output mode, that is, thousands, hundred, ten, and one-digit BCD codes alternately. Output on Q0~Q4, and sync word strobe signal appears on DS1~ DS4. As shown in Figure 3. The MC1403 integrated precision + 2. 5 V voltage source is divided by the potentiometer and used as the reference voltage for A/D conversion. The DU terminal of the MC14433 is connected to the EOC terminal to select the continuous conversion mode, and each conversion result is sent to the output register. EOC is the output flag signal at the end of the A/D conversion. When the MCU reads the A/D conversion result, it can use the interrupt mode or the query mode. In order to make the MCU busy with other tasks, the design system adopts the interrupt mode. The DU terminal is connected to the EOC and optically coupled to the INT1 terminal of the microcontroller. Optocoupler isolation circuit The number of word characters has further exerted the application of liquid crystal display technology in the single chip system. The OCMJ4 @8C module is ideal for displaying intelligent instrumentation systems and household appliances with a large amount of Chinese character information. The 8-bit parallel interface can be used to transmit signals and serial data and serial transmission data. This design system uses a parallel transmission method. The MCU control and LCD interface circuit are shown in the figure (J91 and J11 are used to connect the LCD). Single chip and liquid crystal display interface circuit diagram Electronic enthusiast network technology editors comment analysis: The SoE system based on single-chip microcomputer and LabVIEW realizes the low-cost data acquisition system architecture. In actual development, LabVIEW shows great flexibility. The MCU data acquisition system in LabVIEW environment combines the flexibility of MCU for data acquisition with Lab2VIEW's powerful data analysis and processing capabilities, and can be widely used in the field of measurement and control. The measuring system not only can measure the temperature in the room, but also measure the temperature in liquid, seed, etc. In practical applications, the system is stable and reliable, and the circuit design is simple and practical.
A waterproof slip ring is a type of sealant that can be used to create a watertight seal between two surfaces. This seal can be used in a variety of applications, including plumbing and automotive manufacturing. Waterproof slip rings are often used in conjunction with other types of seals to create a watertight system. It enables liquid and gas to flow freely between the two, without any leakage. This essential technology is used in a variety of industries, from automotive manufacturing to food processing.
Waterproof slip rings are mainly made of silicone rubber. They can be used in harsh environments and have a long life span. Silicon is an inert material and does not corrode in water or other liquids. It also has a low coefficient of friction, which makes it ideal for use in moving parts. Slip ring motors are typically used in high-power applications where large amounts of the current need to be transmitted. They are made of copper or aluminum to provide good electrical conductivity.
The Oubaibo waterproof slip ring is very popular on the market. It is made of high-quality materials and has a long lifespan. The slip ring is also very easy to use, and it can be connected to a wide range of devices. Additionally, the slip ring is Ethernet-enabled, which makes it perfect for industrial applications.
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