This is where you talk about the NXJ hardware related topics such as the brick, sensors, LEGO pieces, etc
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I found that LeJOS uses TYPE_LOWSPEED_9V constant to specify 9V power level for some I2C sensors. But I could not find any documentation that describes the necessary power level for these sensors.
I tested HiTechnic Accelerometer sensor using TYPE_LOWSPEED_9V and TYPE_LOWSPEED and found that it worked in both cases.
What advantages of using 9V power level instead of 5V? Is it safe to use HTAccelerometer sensor in HIGH_SPEED mode using 9V power level (by specify TYPE_LOWSPEED_9V)?
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It all depends on the sensor, for instance the Lego Ultrasonic sensor requires 9V to operate correctly (it uses the 9V supply in a voltage doubler circuit to driver the ultrasonic emitter). I suspect that all certified Lego devices will be safe with a 9V supply. As to other devices best read the documentation. The safe option is to try it with 5V if it works stick to that...
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