Hello,
I'd like to try this accelerometer Triple_Axis_Accelerometer_Breakout_-_ADXL345__SKU_SEN0032_-DFRobot
It needs a 2.0-3.6VDC Supply Voltage . OK, I'll use the 3.3V pin of the Uno to power it, but what would you do for the SDA/SCL pins ?
In the link above, they have them connected without any step-down !
In the datasheet, the absolute maximum ratings are :
VS ?0.3 V to +3.6 V
VDD I/O ?0.3 V to +3.6 V
Digital Pins ?0.3 V to VDD I/O+ 0.3 V or 3.6 V, whichever is less
All Other Pins ?0.3 V to +3.6 V
Output Short-Circuit Duration (Any Pin to Ground) Indefinite
Temperature Range
Powered ?40°C to +105°C
Storage ?40°C to +105°
Then, what would you advise me to do ? Step down with a 2 resistor voltage divider on SDA and SCL was the 1rst thing I planned to do, but....
what about the pull-up resistors ? Do I connect them to the 3.3V of the arduino ?
And if so, what do you think the resistors should be, for the divider, and for the pull-ups ?
Or do I connect the pull-up resistors to the +5V , the resistor being then the same value as the "R1" resistor of the divider ? (I think it is the best solution, but.... )
Thanks for your time,
jf
!
) !