Arduino Pro Mini & DS18B20
I tried for 2 days now to build this project https://www.mysensors.org/build/temp. Unfortunatly I am not able to get this temperature read out with a Arduino Pro Mini. When I use a Nano it works. !?!
What could be wrong here? I tried 2 different Arduino Pro Mini boards but both don't work.
What could be different between the Arduino Pro Mini and Nano?
Do have the famous 4k7 Ohm resistor from VCC to data pin? DS18B20 min voltage is 3.0V and regardless if you use a 5V or 3,3V Arduino voltage it should work.
Maybe if you use read too quick it can't get enough voltage/power to the DS18B20 in parasite power mode
Yes, I have the 4k7 resister from VCC to data pin. The voltage is 3.3.
when compiling in Arduino IDEdo you remember to select correct Arduino board, Pro Mini and choose 3.3v 8MHz.
Tools->Board->"Arduino Pro or Pro Mini"
Maybe if you forget this you will compile with wrong oscillator frequency and get wrong timings to your communication to DS18B20
Thanks!! Yes this was the trick! Wrong Speed!
Happy New Year!!
Good that you replied what made the trick for you, so other can read what to check
Couldn't agree more.
This might just be the problem I face.