Is Flora LSM 303 compatible with an Arduino Uno Ethenet ?

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PierreFreyssinet
 
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Is Flora LSM 303 compatible with an Arduino Uno Ethenet ?

Post by PierreFreyssinet »

Hi,
Context: I have a FLORA Accelerometer/Compass Sensor - LSM303 (PRODUCT ID: 1247) that I will eventually connect to a Flora in a wearable project.
But I feel I need to make a lot of testing to write a proper code that will light LEDs when sensing a deceleration. I therefore thought I could try to connect this sensor to an Arduino Ethernet board I can borrow from friends. This board is based on a Uno R3, but comes with a built-in SD card that will be handy to log data.

But ! The LSM 303 is a 3.3V max chip.
I understand the breakout version of this accelerometer (PRODUCT ID: 1120) is equipped with some circuitry that makes it compatible with both 3.3 and 5 v boards.
Is it the same with the Florafied version I owe? In other words, will it work with the Arduino Ethernet, if I connect it to GND, 3.3 v and the SCL and SDA pins that are located left to AREF?
Thank you for your help.
Pierre

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adafruit_support_bill
 
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Re: Is Flora LSM 303 compatible with an Arduino Uno Ethenet

Post by adafruit_support_bill »

The board has pullup resistors on the SDA and SCL lines to 3.3v. Since the Arduno has no pullups, the i2c bus voltage will be 3.3v and it will be safe for the LSM 303.

PierreFreyssinet
 
Posts: 39
Joined: Fri Feb 14, 2014 5:07 am

Re: Is Flora LSM 303 compatible with an Arduino Uno Ethenet

Post by PierreFreyssinet »

Thank you again Bill for your prompt and meaningful answers.

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