There are a variety of sensors to measure temperature in devices such as Arduinoand ESP8266, in this case we have chosen the Sensor DS18B20this particular sensor is not connected through a GPIO Analogue, technically it is a digital sensor that uses the protocol Onewire or 1- Wire designed by dallas semiconductor, There are many tutorials on the net about this protocol.
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Reference:Datasheet DS18B20 Maxim
Max cable lenght 2 meters - 2 meters 2 meters - Baudrate 19.2 kbit/s - 125-500 kbit/s 5-1000 kbit/s - Certifications CE certified and RoHS compliant- CE certified and RoHS compliantCE certified and RoHS compliant-ORDERING INFORMATION Order code 017504 (Profibus-DP) 017505 (Profibus-DP/DPV1) 024710 (Basic) 024720 (Plus) 020 1.24.0034.03100. 2 Rear: Front: 80 to 110 Ncm Figure 4-1 Installing the RS 485 repeater on an S7-300 mounting rail Removing the repeater from an S7-300 mounting rail To remove the RS 485 repeater from the S7-300 mounting rail: 1. Loosen the fixing screw of the RS 485 repeater (1) and 2. Pull the RS 485 repeater up and out (2). Corelcad 2020 20 0 0 1074.
In this case we have adapted our temperature sensor for fast connections, the sensor, the datasheet of
DS18B20Maxim recommends using a resistance of 4.7k, but we will use a resistance of 3.3k, but for ease we will use 3 resistors of 10k in parallel, This modification will allow your ESP8266 modules to work with this sensor without difficulty, with the help of heat shrinkable resistors and wiring.
Required Materials
Test
We will use a module ESP8266 12E NodeMCU and the Onewire library, in this case, step by step the methods of sending and requesting sensor data.
Connections, GND, 5V, GPIO(2) PIN D4
Arduino IDE Code
In this case the code indicates step by step the process of requesting data to the probe, this example can easily be modified for other implementations with onewire, I decided to use this example to understand step by step how the Onewire protocol works.
- Requires Libreria Onewire.h
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 | OneWire ds(2); // put your setup code here, to run once: } voidtemperature(){ bytepresent=0; bytedata[12]; floatcelsius,fahrenheit; if(!ds.search(addr)){ /// Serial.println(); delay(250); } Serial.println('fallo'); addr[i]; if(OneWire::crc8(addr,7)!=addr[7]){ return; switch(addr[0]){ break; break; // Serial.println(' Chip = DS1822'); break; Serial.println('Device is not a DS18x20 family device.'); return; ds.select(addr); delay(1000); present=ds.reset(); ds.write(0xBE); //Serial.println('Paso 7'); for(i=0;i<9;i++){ } OneWire::crc8(data,8); int16_t raw=(data[1]<<8)|data[0]; raw=raw<<3; raw=(raw&0xFFF0)+12-data[6];} bytecfg=(data[4]&0x60); if(cfg0x00)raw=raw&~7;// 9 bit resolution, 93.75 ms elseif(cfg0x20)raw=raw&~3;// 10 bit res, 187.5 ms elseif(cfg0x40)raw=raw&~1;// 11 bit res, 375 ms celsius=(float)raw/16.0; if(isnan(celsius)){ } Serial.print('Temperature: '); // put your main code here, to run repeatedly: delay(1000); |
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Conclusions
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Although it is considered that we simply test the sensor, this tutorial invites to adapt the Sensor and the resistance to facilitate connection in tests, this sensor will be used in a lot of future tests.
A great advantage of the use of these sensors, since being digital and using a protocol, allows to create a network of sensors to a single input (GPIO).
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In times of just in time production as well as increased safety requirements plants have to imply redundancy. In case of failure of the operational system the complete control function must be taken over by a stand-by system. The optimal solution is PRS - PROFIBUS DP Redundancy Switch
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PRS is a compact 24 Volt hat rail module containing the switching logic as well as an intelligent double DP Slave. The device allows the connection of two DP Masters and the PROFIBUS connection to the DP Slaves. The Switch controls the status of the operational DP Master system on the PROFIBUS protocol and application level.In case of failure of the operational Master the device physically switches over to the stand-by Master, which seamlessly takes over the DP Slaves.
In contrast to the established Flying Master principle a double address conflict cannot occur with PRS, even if the failed DP Master is still active on the PROFIBUS level.
Furthermore, many DP Master implementations on the market do not support the Flying Master principle. As both DP Masters are prevented from being connected to the bus at the same time, the device avoids all disadvantages of current redundancy concepts.
PRS provides the DP Master systems with important information about the redundancy operation, i.e. the alive state of the complementary system It also allows the execution of a switch-over command. The device can be used in very complex redundancy systems, i.e. in connection with PROFIBUS OPC servers or overlying Ethernet based cell networks. Leech 3 1 3 – complete control over your downloads. Duphunter 2 0 mac os x. Furthermore, PRS can be controlled via both integrated Ethernet connections if direct control via the PROFIBUS is not possible.
There is no single point of failure with PRS because if the device does develop a fault the Master to Slave communication would continue without interrupted.
In contrast to the established Flying Master principle a double address conflict cannot occur with PRS, even if the failed DP Master is still active on the PROFIBUS level.
Furthermore, many DP Master implementations on the market do not support the Flying Master principle. As both DP Masters are prevented from being connected to the bus at the same time, the device avoids all disadvantages of current redundancy concepts.
PRS provides the DP Master systems with important information about the redundancy operation, i.e. the alive state of the complementary system It also allows the execution of a switch-over command. The device can be used in very complex redundancy systems, i.e. in connection with PROFIBUS OPC servers or overlying Ethernet based cell networks. Leech 3 1 3 – complete control over your downloads. Duphunter 2 0 mac os x. Furthermore, PRS can be controlled via both integrated Ethernet connections if direct control via the PROFIBUS is not possible.
There is no single point of failure with PRS because if the device does develop a fault the Master to Slave communication would continue without interrupted.