SparkFun Forums 

Where electronics enthusiasts find answers.

For the discussion of Arduino related topics.
By theepdinker
I have a BMP085 pressure sensor mounted on the Sparkfun breakout board SEN-09694. It is working with my Arduino UNO.

However, I wonder if I might be damaging it with the wrong voltage on the SDA and SDC lines. The Vcc input I have hooked to the Arduino 3V3 power. The SDA and SDL lines go to the Arduino A04 and A05 lines. However, I believe that those lines default to 5V, differing from the VCC to the sensor of 3V3. The pressure calculated is correct, but the noise (20 Pa) is higher than expected. Is the voltage mis-match a possible cause of the noise?

Is the voltage on the SDA and SDL likely to damage the BMP085?

I have thought of a possible fix: Hook the Arduino Aref to the 3V3 supply, and use the analogReference (EXTERNAL). Will this change the operating voltage of the I2C outputs on the pins?
long long title how many chars? lets see 123 ok more? yes 60

We have created lots of YouTube videos just so you can achieve [...]

Another post test yes yes yes or no, maybe ni? :-/

The best flat phpBB theme around. Period. Fine craftmanship and [...]

Do you need a super MOD? Well here it is. chew on this

All you need is right here. Content tag, SEO, listing, Pizza and spaghetti [...]

Lasagna on me this time ok? I got plenty of cash

this should be fantastic. but what about links,images, bbcodes etc etc? [...]