Impermeabil un fir DS18B20 TEMP SENSOR MODUL SONUL

arduino, raspberry pi-dallas-sonoff esp8266-one wire DS18B20 temp sensor module probe kit.
DS18B20 is a commonly used digital temperature sensor probe (arduino, raspberry pi, multiple esp8266 DS18B20). Ieșirea sa este un semnal digital, care are caracteristicile de dimensiuni mici, Hardware scăzut, capacitate puternică anti-interferență și precizie ridicată.
The DS18B20 digital temperature sensor is easy to wire and can be used in a variety of situations after being packaged. Such as pipe type, tip filetat, tip de adsorbție magnetică, tip pachet din oțel inoxidabil, diverse modele, inclusiv LTM8877, LTM8874 și așa mai departe.
Aspectul său se schimbă în principal în funcție de aplicație. DS18B20 încapsulat poate fi utilizat pentru măsurarea temperaturii cablului, măsurarea temperaturii de circulație a apei de furnal, măsurarea temperaturii cazanului, computer room temperature measurement, măsurarea temperaturii în serele agricole, măsurarea temperaturii camerei curate, măsurarea temperaturii depozitului de muniții și alte ocazii de temperatură nelimită. Rezistent la uzură și la impact, de dimensiuni mici, usor de folosit, cu diverse forme de ambalare, este potrivit pentru măsurarea digitală a temperaturii și controlul diferitelor echipamente pentru spații mici.

DS18B20 1 m /3.2 FT Temperatură digitală cablu termic Senzor de sondă impermeabil -55 ° C până la +125 ° C

DS18B20 Senzor de temperatură Sondă de temperatură Pachet din oțel inoxidabil Impermeabil 1M

DS18B20 digital temperature sensor delivers accurate readings within a measurement range of -55°C to +125°C

How the DS18B20 temperature sensor works
The reading and writing timing and temperature measurement principle of DS18B20 are the same as that of DS1820, except that the number of digits in the temperature value obtained differs due to different resolutions. And the delay time during temperature conversion is reduced from 2s to 750ms. The temperature measurement principle of DS18B20 is shown in Figure 3. The oscillation frequency of the low temperature coefficient crystal oscillator in the figure is very little affected by temperature, and is used to generate a fixed frequency pulse signal and send it to counter 1. The oscillation frequency of the high temperature coefficient crystal oscillator changes significantly with temperature changes, iar semnalul generat este folosit ca intrare de impuls a contorului 2. Contra 1 iar registrul de temperatură sunt presetate la o valoare de bază corespunzătoare la -55°C. Contra 1 numără invers semnalul de impuls generat de oscilatorul cu cristal cu coeficient de temperatură scăzut. Când valoarea presetată a contorului 1 scade la 0, valoarea registrului de temperatură va fi mărită cu 1, valoarea presetată a contorului 1 va fi reîncărcat, și contor 1 va relua numărarea semnalelor de impuls generate de oscilatorul cu cristal cu coeficient de temperatură scăzut. Acest ciclu continuă până la contor 2 conteaza pana la 0, apoi se oprește acumularea valorii registrului de temperatură. În acest moment, valoarea din registrul de temperatură este temperatura măsurată. The slope accumulator is used to compensate and correct the nonlinearity in the temperature measurement process, iar ieșirea sa este folosită pentru a corecta valoarea presetată a contorului 1.

Technical performance of DS18B20 temperature sensor
1. Technical performance description:
①. Metodă unică de interfață cu un singur fir. Când DS18B20 este conectat la microprocesor, are nevoie doar de o linie de port pentru a realiza o comunicare bidirecțională între microprocesor și DS18B20.
②. Temperature measurement range -55℃～+125℃, inherent temperature measurement error (note, not resolution, it was wrong before) 1℃.
③. Sprijină funcția de rețea în mai multe puncte, multiple DS18B20 can be connected in parallel on the only three lines. Only up to 8 poate fi conectat în paralel pentru a realiza măsurarea temperaturii în mai multe puncte. If there are too many, the power supply voltage will be too low, resulting in unstable signal transmission.
④. Sursa de alimentare de lucru: 3.0~5,5 V/DC (data line parasitic power supply can be used)
⑤. No external components are required during use.
⑥. The measurement results are transmitted serially in the form of 9~12-digit digital quantities.
⑦, Stainless steel protection tube diameter Φ6
⑧ Suitable for temperature measurement of DN15~25, DN40~DN250 various medium industrial pipelines and narrow space equipment
⑨. Standard mounting thread M10X1, M12X1.5, G1/2” optional
⑩, PVC cable outlet directly or German ball junction box outlet, easy to connect with other electrical equipment.
DS18B20+ and Maxim Integrated information
Manufactured by Maxim Integrated, DS18B20+ is a temperature sensor.

Wiring method of DS18B20 sensor
The DS18B20 component faces the flat side, with negative left and positive right. Once connected incorrectly, it will become hot immediately and may burn! În același timp, reverse connection is also the reason why the sensor always displays 85°C. In actual operation, if the positive and negative connections are reversed, the sensor will heat up immediately and the LCD screen will not be able to display the reading. After the positive and negative are connected, it shows 85℃. în plus, if a 51 microcontroller is used, the middle pin must be connected to a 4.7K-10K pull-up resistor. Altfel, because the high level cannot be input/output normally, it will either display 85°C immediately after powering on, or the temperature will jump randomly between 85°C and the normal value after a few months of use.
DS18B20 sensor wiring harness features
The unique one-line interface requires only one port line for communication and multi-point capabilities, simplifying distributed temperature sensing applications. No external components required Data bus power available, domeniul de tensiune 3.0 V la 5.5 V No backup power required Measured over temperature range -55°C to +125°C. The Fahrenheit equivalent is -67°F to 257°F. Accuracy ±0.5°C over temperature range -10°C to +85°C
The programmable resolution of the temperature sensor is 9~12 bits. Temperature conversion to 12-bit digital format maximum 750 Domnișoară, user-definable non-volatile temperature alarm settings. Applications include thermostatic controls, industrial systems, consumer electronics thermometers, or any heat-sensitive system. Description The DS18B20 digital thermometer provides 9 la 12 digit (programmable device temperature readings). Since the DS18B20 communicates via a serial port line, there is only one serial port line connection between the central microprocessor and the DS18B20. For reading, writing and temperature conversion, energy can be obtained from the data line itself and does not require an external power supply. Because each DS18B20 contains a unique serial number, multiple DS18B20s can exist on the same bus at the same time. This allows temperature sensors to be placed in many different places. It has many uses, including air conditioning environment control, sensing the temperature inside buildings or machines, and for process monitoring and control.
DS18B20 uses a first-line communication interface. Because of the first-line communication interface, ROM settings must be completed first, otherwise the memory and control functions will not be available. Mainly first provide one of the following function commands: 1) Read ROM, 2) ROM match, 3) Search ROM, 4) Skip ROM, 5) Alarm check. These instructions operate on the 64-bit photolithography ROM serial number of a device, and can select a certain device among multiple devices hanging on a line. În același timp, the bus can also know how many and what kinds of devices are on the bus.
If the command successfully causes the DS18B20 to complete the temperature measurement, the data is stored in the memory of the DS18B20. A control function directs the DS18B20 to perform temperature measurement. The measurement results will be placed in the DS18B20 memory and can be read by issuing memory functions commanded to read the contents of the on-chip memory. The temperature alarm triggers TH and TL have one byte of EEPROM data. If the DS18B20 does not use alarm check instructions, these registers can be used for general user memory purposes. On-chip also contains configuration bytes ideal for solving temperature-to-digital conversions. Writing TH, TL instructions and configuration bytes is completed using a memory function instruction. Read the register through the buffer. All data is read and written starting from the lowest bit.
Components of DS18B20 sensor:
DS18B20 memory
The memory of DS18B20 includes cache RAM and electrically erasable RAM. The electrically erasable RAM also includes temperature triggers TH and TL, and a configuration register. The memory can completely determine the communication of the first line port. Numbers are initially written into the register using the write register command, and then the numbers can be confirmed using the read register command. When confirmed, the copy register command can be used to transfer these numbers to electrically erasable RAM. This process ensures the integrity of the numbers when the numbers in the registers are modified.
The scratchpad RAM is composed of 8 bytes of memory;. The ninth byte can be read using the read register command. This byte is used to verify the previous eight bytes.
64-bit photolithographic ROM for DS18B20:
Primul 8 bits of the 64-bit photolithography ROM are the DS18B20’s own code, următorul 48 bits are continuous digital codes, and the last 8 bits are the CRC check for the first 56 biți. The 64-bit photolithography ROM includes 5 ROM function commands: read ROM, match ROM, jump ROM, search ROM and alarm search.
DS18B20 external power supply connection:
DS18B20 can use the external power supply VDD or the internal parasitic power supply. When the VDD port is connected to a voltage of 3.0V-5.5V, an external power supply is used. Internal parasitic power is used when the VDD port is grounded. Whether it is an internal parasitic power supply or an external power supply, the I/O port line must be connected to a pull-up resistor of about 5KΩ.
Configuration register of DS18B20:
The configuration register configures different bits to determine temperature and digital conversion.
It can be known that R1 and R0 are the determining bits of temperature. Different combinations of R1 and R0 can be configured as 9-digit, 10-digit, 11-digit, or 12-digit temperature display. În acest fel, the conversion times corresponding to different temperature conversion positions can be known. The resolutions of the four configurations are 0.5°C, 0.25°C, 0.125°C and 0.0625°C respectively, and are configured as 12 biți când sunt expediate din fabrică.
Temperature reading of DS18B20:
The DS18B20 is configured as 12-bit when shipped from the factory. When reading the temperature, un total de 16 bits are read, and the first 5 bits are sign bits. When the first five bits are 1, the temperature read is a negative number. When the first five bits are 0, the temperature read is a positive number. The reading method when the temperature is positive is to convert the hexadecimal number into decimal. When the temperature is negative, the reading method is: invert the hexadecimal system, add 1, and then convert it to decimal system. Exemplu: 0550H = +85 grade, FC90H = -55 grade.