Timeline for Connecting a LSM9DS0 9DoF module to Arduino Uno
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Feb 13, 2015 at 11:11 | comment | added | kontur | Thanks, I've since read up on it and realised I confused logic voltage and powering voltage here, as I've had never heard of logic voltage levels. :) | |
| Feb 13, 2015 at 11:10 | vote | accept | kontur | ||
| Feb 12, 2015 at 13:25 | comment | added | darwinawardee | You can safely power it from the 3.3V pin, but cannot safely communicate over SDA and SCL (or any other UNO pins) as they are at the wrong voltage. You'll need a logic level shifter to safely connect those pins. Take a look at sparkfun's logic level guide if you want to learn more about why this is. | |
| Feb 11, 2015 at 7:46 | comment | added | kontur | Hm, interesting. So did I understand correctly that I should not connect it straight to the 3.3V pin of my Uno? | |
| Feb 10, 2015 at 10:51 | comment | added | darwinawardee | Ah, there's two voltages to consider, to voltage to power a device and the voltage its logic runs at. It's the latter that's referred to here. Essentially at what voltage in digital communications logical HIGH is considered to be. This IMU can only tolerate digital communications (SDA & SCL) at 3.3V logic level. Your UNO can supply power at 3.3V but has a 5V logic level for its pins, the logic level converter takes 5V signals from the Arduino and converts them to 3.3V for the IMU and takes the 3.3V replys and converts them back up to the 5V level the Arduino expects. | |
| Feb 6, 2015 at 10:26 | comment | added | kontur | In the second example it states "... if you have a 3.3V-operating Arduino – like the 3.3V/8MHz Pro – you can connect SDA and SCL directly from microcontroller to sensor." - is this equivalent to using the Arduino Uno's 3.3V pin? | |
| Feb 6, 2015 at 10:17 | history | answered | darwinawardee | CC BY-SA 3.0 |