meysam_abbasinia
Advanced Member level 4
hello
my friend I'm work on DS18b20 temperature 1wire sensor ,
I test it with 2 m cable it is ok and working
but another sensor is connected with 18 meter cable and don't work. why?
I use 3.3 KΩ pull up resistor on PCB
now I have 2 question :
1- maximum length of DS18B20 ?
2- where we must connect pull up resistor? on PCB far of sensor or near of sensor?
thank you.
---------- Post added at 20:54 ---------- Previous post was at 20:47 ----------
hey , now I solved my problem, pull up resistor must connect near sensor , and it work with 18 meter cable.
now , my question is maximum of length.
my friend I'm work on DS18b20 temperature 1wire sensor ,
I test it with 2 m cable it is ok and working
but another sensor is connected with 18 meter cable and don't work. why?
I use 3.3 KΩ pull up resistor on PCB
now I have 2 question :
1- maximum length of DS18B20 ?
2- where we must connect pull up resistor? on PCB far of sensor or near of sensor?
thank you.
---------- Post added at 20:54 ---------- Previous post was at 20:47 ----------
hey , now I solved my problem, pull up resistor must connect near sensor , and it work with 18 meter cable.
now , my question is maximum of length.