Thanx for awesome advice in this thread. I’ve been struggling with 4 dallas sensors together with an azDelivery ESP32 wroom. I was having issues like scratch pad checksum and conversion fail etc.
I tested the dallasng with no luck. Finally I was playing around with different resistors as suggested in different threads (from 4.7k to 1k). When measuring resistance over 3.3v and data I noticed that I had about half of the value over the resistor. Also I had som small connection between 3.3 and ground (my instrument didnt beep when testing soldering joints) but when measuring I could clearly see that there was i small connection.
I cleaned my testboard from flux residue and all the sensors came alive!!
Long story short, If you read this thread and make the assumption that your hardware/software is faulty (like I did). Measure your resistance in the final circuit! It seems like the current sw-code is very picky.