hello,
it is the first time i am tinkering with ds18b20 temperature sensor. i wired it like this:
but to my surprise as soon as i start arduino with sensor connected it immediately disconnects, power led flickers as if there was a problem with power. right after sensor disconnection, arduino continues function.
anyone can please hint me what could be the problem? i expected this to be rather a simple task.
br, jose
If you're sure your connections are like in the schematic, I think your DS18B20 is shorted.
It should not drain that much power. According to the datasheet, max is 1.5mA.
thank you! i measured a way more current with multimeter. also, the 2nd sensor i have does not cause the issue.
how come that i do not detect a short-circuit with multimeter on ds18b20 itself? could it be that it only manifests itself when on power? is there a way how do i fix it (have the long - waterproof - version of it). kind regards,
jose
I think the short only shows up when power is applied.
Are your two sensors the same type? There has been a lot of confusion regarding the cable colours on some
of the waterproof DS18B20's
Try to Google : waterproof ds18b20 wiring.
same type, same vendor, same order. colors are: red, black and blue. i only did a quick test with the 2nd sensor leaving out blue (which i believe is signal) disconnected.
I tried to make a search on the forum pages with 'DS18B20 wiring colour'
and got DS18B20 not detected - Project Guidance - Arduino Forum as response.
The 2'nd entry from el_supremo can be the same problem you are facing.
So according to him, you should try to swap the red and the blue wire.
Remember the pull-up 4.7Kohm from -5v. to the data pin (now the red).
/ffur
OOPs. The last line should be +5v. - sorry
OPs. The last line should be +5v. - sorry
You can edit your post. Use 'Quick Edit' or 'More (then Modify)' down at the lower right, next to 'Quote' on your own posts.
Don
Hi,
I have sold thousands of those sensors. Here is what I have found about colors:
---------------------( COPY )---------------------
Sensor Connections:
red (VCC)
blue or white or yellow (DATA)
black (GND)
Some Versions, like Adafruit, have these connections: Orange Stripe: (VCC) White: (GND) Blue Stripe:(DATA)
-----------------( END COPY )----------------------
jose1711:
same type, same vendor, same order. colors are: red, black and blue. i only did a quick test with the 2nd sensor leaving out blue (which i believe is signal) disconnected.
The signal line requires a pull-up resistor - omitting this might cause all manner of bizarre behaviour as
the data wire is floating.
