RESISTORS — and use with DS18B20 September 17, 2011Posted by rik94566 in 1-wire, aquaponic automation, aquaponics, arduino, CAT 5 Cable, DIY aquaponics, DS18B20, indoor aquaponics, indoor gardens, indoor growing, One-wire, sensor, Sensor Hub, Stainless Steel Temp Probe, Temperature Probe.
Tags: aquaponic automation, aquaponic crop, aquaponics, arduino, arduino sketch, automation, CEA, Controlled Environment Agriculture, DIY aquaponics, DS18B20, indoor aquaponics, microcontroller, Miles Burton, rik kretzinger, sensor, Temp Probe, Temperature Probe
In order to read DS18B20 IC’s or temperature probes a resistor is required. The standard one used in almost all work done on breadboard examples are 4.7K ohm. Upon researching work done with 1-wire temp sensing most people are only working with 1 to 2 DS18B20’s and most of this is with breadboards. In a few cases people are using 3 or 4 only. I have found no cases where anyone is working and in production with 5 or more DS18B20 probes. So I think this is somewhat new ground. That being the case, there is a lot written that as you increase the number of DS18B20’s the power draw becomes greater and you need to decrease the resistor size. The common thought is to go to 2.2K ohm resistor. If that does not work the next size to work with is 1.0K ohm. Well this will be my next testing platform. I will be testing both the 4.7K and 2.2K resistors with up to 10 DS18B20 probes to determine what works and what does not work. Along the way I will determine what happens and how it happens and where the breaking points are in the hardware and the sketches. Will be fun stuff.