I am using 2 DS18B20 temperature sensors connected to my raspi. They are connected to a 5 meter long cable together with a DHT11 humidity sensor, do they share plus and minus. The problem I have is both the sensors are returning really high values above 80°C. I heard they return 85°C when they fail, but that seems not to be the case here as they return like 83.6 for example. Is anyone experiencing similar problems?
Also the DHT11 sensors reports >90% humidity, could that be the problem?
EDIT: the cable I have has 4 wires. 2 are used for power and get shared between the 3 sensors. The 2 wires left are for the dht11 and the 1-wire interface. Also this does not happen all the time. Most of the time it worls great. I have another ds18b20 near the raspberry inside the case on a short cable which works without problems.