- Tue Sep 13, 2016 6:36 am
#55014
The task is to get data from ds18b20 and send it through the internet using mqtt. First tried it via C in eclipse, ds18b20 was detected correctly but i couldn't publish through te internet, only in local network. Then i tried Arduino ide, it sent all correctly but another problem - ds18b20 not detected. So what's the problem??? I thought about problems with DS, but with C code it works well.
- Tue Sep 13, 2016 4:16 pm
#55048
Do you have a 4K7 PullUp on the data line ?
- Wed Sep 14, 2016 2:22 am
#55074
No, i don't. But when i had done it via C, this part worked well.
- Wed Sep 14, 2016 12:52 pm
#55105
You should ! 
Probably the library you used in plain C were enabling the internal PullUp, but I recommend to still using external one, since for long wires, the OneWire specs require 4K7, far from internal one which is around 100K.
Probably the library you used in plain C were enabling the internal PullUp, but I recommend to still using external one, since for long wires, the OneWire specs require 4K7, far from internal one which is around 100K.
