Hello friends,
Could you please help me to answer this question. Can you transmit signal wirelessly via (Wi-Fi, Bluetooth or RT-RR) from IMU digital board (MPU-9150 Breakout) to the Arduino board for further signal processing? The reason why I am curious to know is because I one to have the device containing IMU as light and as small as possible, therefore I would like to keep Arduino apart, which would make the battery smaller as well. Thank you for helping me!
I doubt it. (just a guess) because you need to transmit all the signals simultaneously without interruption and they have to be perfectly synchronized. I think you would need 6 wireless modems. (transmit/receive pairs). If you think of it as a spread-spectrum
radio link to an RC aircraft with 6 channels, then theoretically a 6-channel transmitter and 6 receivers would be required for all the
signals to be realtime and simultaneous but an RC transmitter only modulates a PWM signal whereas you device has signals that are
very different. Theoretically, 6 digital modems might work. That's pie in the sky expensive.
I don't see a problem with the idea. The data are transmitted serially from the IMU sensor to a microcontroller in the normal situation (via I2C or some other bus), and could be further transmitted serially over a reasonably high speed link to any other computer. Bluetooth or Pololu's Wixel modules offer lossless, wireless serial links that run up to 10 k bytes/second data transfer rate, which is way more than you need for a 50 Hz sensor update rate.
However, you need an interface between the sensor and the wireless modules in order to accomplish this task and a small Arduino (e.g. micro) or some other microcontroller (like that built into the Wixel) would be needed anyway. This is essentially what Sebastian Madgwick does in his gait-tracking work, where IMUs are attached to a person's shoe and transmit data to a remote logger: Gait tracking with x-IMU – x-io Technologies