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January 11, 2011
about 2 years ago
Thanks for the additional “fine print” information. I want to ask a clarification on 3.3V vs 5V.
you shouldn’t mix 5V and 3.3V sensors on the same bus
I use an Arduino connected to a DS2482-800 (8-channel 1-Wire master) with a network of DS18B20 temp sensors. The 1-Wire master is powered by 5V off of the Arduino and all temp sensors run in parasitic power mode off of the 1-Wire master.
My intent is to connect the BMP180 to one of the channels of the 1-Wire master. If I understand your comment correctly, I should not connect a 3.3V sensor to a system running at 5V.
I expect the solution is to try powering the entire system on 3.3V and change the pull-up resistors. Not sure if all my temp sensors will still work in parasitic power mode but it’s worth a try.
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