Some experience with DS18B20

Crystal oscillator 2.5*2.0mm 2520 0.67M~170M OSC can be supplied at any frequency

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

1. When using single-line multi-point, although the software can search and identify the ROM code of all devices, but can not associate the ROM code with the physical location of the device, it is necessary to read each ROM code separately before accessing the system, and then Place the device as needed.

2. After the ROM code is known, the DS18B20 can be operated separately using the "match ROM" command, but it can be operated uniformly for some commands that are only sent by the host without receiving. If you need to measure temperature, you can use the "Skip ROM" command and then send the "Start Temperature Measurement" command to start all DS18B20 on the bus to start a temperature measurement, and then the host can use "match ROM" and "read memory". The command reads the temperature of each point one by one. This not only saves time, but also ensures good synchronization of the collected points.

3, DS18B20 single bus transmission distance is very far, the author has used more than 20 meters without any treatment, some people say that can reach 50 or even hundreds of meters. In the case of isolation or amplification, please pay attention to the use of high-speed optocouplers, such as 6N137, etc., used in pairs, 1 round and 1 receive.