Using one-wire DS18B20 sensors as simple id chips, what is the fastest method?

Other Hardware Sensors
1

I'm using some DS18B20 temperature sensors as ID's for devices since they're cheaper than the DS2401 (weird but they are).

Two questions...
Is it faster to poll a know list of ID's to see if they're there, or use the search method?

What is the fastest way to check if a sensor is there, for a known ID?

Cheers,
Woody

2

There are plenty of Address finder scripts already written out there. Just use one that suits your needs and speed

3

The 1-Wire search method has an ingenious way to find the sensors. I prefer a search with the Arduino OneWire library. You can test the time it takes yourself :wink: I don't know if someone has tested that.

4

Here is one or two

http://www.hobbytronics.co.uk/ds18b20-arduino

https://playground.arduino.cc/Learning/OneWire

You can also connect it in parasitic mode to reduce wires