Multiple SPI accelerometer reading

Projects Networking, Protocols, and Devices
1

Hello;

I'm new here and also a beginner in programming.
For a project I have to monitor/record accelerations on a steel structure on several positions.
I already used analog accelerometers with the Uno, but the lack of speed due to Analog Read and the low number of analog pins convince me to start an I2C protocol.
Basically I understand simple protocol with only one sensor 7455l. But in my case I have 3 accelerometers (so 9 axis) to monitor with Serial Oscilloscope software.
The idea is the following:

read the 3 axis of acc.1
Store them in the buffer
read the 3 axis of acc.2
Store them in the buffer
read the 3 axis of acc.3
Store them in the buffer
add \r at the end of the string so Serial Oscilloscope can understand its the end of the channels
flush the results through serial to the computer

I2C seems to be the most accurate protocol because I just need to read slaves and it only requires 2 wires.
The frequency monitored are below 10kHz, so a short delay between sensor reading is not an issue (but it was on analogread).

Thank you so much for your help.

[edit] as the I2c address seems frozen, i changed my idea to a SPI protocol

2

But in my case I have 3 accelerometers

Can you change the I2C address of them? If do, you can read all three on the one I2C bus. If not, you can't.

3

Hello;

Thanks for the advices.
On the datasheet, it doesn't seems possible.
SPI protocol could save me, the few I understand of it is the Arduino can select "who to read" thanks to the Chip Select (but requires more wires).
This is exactly what I want to build