2, the advantage of digital temperature sensor is that the composition of temperature control system is simple and the cost is low Temperature sensor chip :. The disadvantage is that the control accuracy is very poor, it can not enter the automatic temperature control system, and the gap with the continuous analog output sensor is too large.
3, electronic temperature sensors are ubiquitous in the field of science and technology, especially in the strict requirements for temperature controlApplications such as biopharmaceuticals, aseptic rooms, smart buildings and data center rooms. The machine room, as the heart of data processing, is crucial for temperature and humidity monitoring. In order to ensure the normal operation of the equipment and the comfortable environment of the staff, the installation of temperature sensors is a must, real-time monitoring and automatic adjustment to ensure the most suitable range.
The sensor looks like the following: The motherboard temperature sensor usually exists on the motherboard in the form of a chip, is a small rectangular black plastic square, appearanceThere are usually four pins on the top, two of which are used to connect the power supply and the other two are used to connect the temperature sensor. The motherboard temperature sensor is a computer hardware component that detects the temperature of the motherboard and transmits the data to the computer system, so that users can understand whether the temperature of the motherboard is normal.
A master IC, gold-plated battery contact shrapnel. The front and back of the motherboard, the integration is very high, there is only one main control IC, gold-plated battery contact shrapnel, next to the reset micro-button. The engine coolant temperature sensor, also known as the water temperature sensor, is installed in the engine block, cylinder head water jacket or thermostat and extends intoWater jacket.
Green line and white line: connected to the temperature sensor, the function is to transmit the real-time temperature to the motherboard and display board through the temperature sensor, so that we know the current temperature, and facilitate the motherboard to receive and receive signals. Blue and red lines: connected to the water level sensor, the resistance is about 60K when not placed in water.
The sensor that detects the CPU temperature is inside the CPU core. The CPU temperature is measured by two built-in thermal diodes of the CPU. The working principle is that the built-in thermal diode detects the temperature and transmits it to the BIOS for display. The temperature reported by the temperature measuring softwareThe value is very inaccurate, and sometimes wrong very unreliable.
The temperature sensor is not seen in your picture. Only see the plug-in for the temperature sensor. The temperature sensor of this air conditioner is connected to the temperature sensor plug-in. The arrow points to the plug-in position of the machine temperature sensor.
This designAT89S52 is a flash single chip microcomputer, which can be programmed directly online, and it is easier to write programs to the single chip microcomputer. DS18B20 digital temperature sensor is used in the design of the digital thermometer, DS18B20 is a high-precision digital temperature sensor that can be networked, because of its unique advantages of single bus, users can easily set up the sensor network, and can make the multi-point temperature measurement circuit simple and reliable.
PROTEUS, when installed, does not generate shortcuts on the desktop by default. Open the Start menu and click on "Process"Sequence, Proteus 7 Professional, ISIS 7 Professional "opens PROTEUS. Click P in the figure to add components such as microcontroller. Search with the keyword, 89C51, and add a few leds, because it is simulation, you do not need to add current limiting resistance and crystal reset components.
You can refer to the following routine, DS18B20 is the same as the CT1820 of Shensiring Microelectronics, is a single bus communication structure, but the CT1820 read speed is 20 times faster.
Through DS18B20 Read the measured temperature value directly, send it to the MCU for data processing, and then output it to display, and finally complete the overall design of the digital thermometer. The system structure is simple, the signal acquisition effect is good, the data processing speed is fast, and it is easy to use in practice.
Temperature alarm as an indispensable temperature sensor chip safety equipment temperature sensingThe core of the chip is the temperature sensing chip of the high precision temperature sensor chip. The MY18E20, a digital temperature sensor chip launched by MYSENTECH, with its excellent performance, provides a precise and reliable solution for temperature control. The temperature sensor is the heart of the alarm, which captures the ambient temperature change and converts it into an electrical signal.
Temperature sensing element in digital display (electronic) temperature, currently mainTo use P-N type semiconductor. PT100 platinum resistor and NTC thermistor from the temperature measurement principle, they have a common characteristic is that the resistance value of their own material can change with the temperature (P-N junction voltammetry characteristics have -2mv/℃ characteristics).
Because DS18B20 digital temperature sensor has the unique advantage of single bus, the user can easily set up the sensor network, and can make the multi-point temperature measurement circuit simple and reliable, so the DS18B20 digital temperature sensor is used in the design to measure the temperature.