Hello,
I'm working on a project that involves sensors that go on a person's body and detect when the left and right sides of the body are not aligned (e.g. when the user is driving and has one hand on the wheel and one had rested). I have a limited background in sensors so I can't decide which sensor is the right one for my project. And also I'm not sure if I need more than 1 sensor per user (since I'm comparing both sides of the body). Can anyone please help me choose the right sensor?
Thanks a lot 
There is no such sensor.
There are sensors which can report their spatial orientation (for example the tilt angles of whatever they are mounted on) but a CPU is required to interpret the data and compare results.
So, imagine a person wearing a wiring harness in addition to the sensors.
would a mc3216-3-axis-accelerometer or a lsm9ds1 3D digital linear acceleration sensor meet requirements ? However, as @jremington pointed out in post #2 you would require a processor to sample the data and process results - I assume the two devices would have to communicate wiith each other or a host device.
Recently involved in a project with a number of wareable devices using the lsm9ds1 which sent data to a Android phone using BLE.
can a sensor send data to a cellphone? I think I should've been more clear. I want to see and read data in a phone preferably in real time. Would that be possible? thanks
No.
But a microprocessor board with a sensor and Bluetooth can send the sensor data to a cell phone. The Nano 33 BLE Sense is one of many examples.
I actually want to connect the sensors to a phone and see the data in the phone in real time (if possible). would that require an additional Bluetooth reader, or lsm9ds1 has that built in? Also do I need more than one lsm9ds1 for this? If so can two lsm9ds1 communicate with each other? Thank you
Thank you. Is this the inertial sensor that makes this sensor suitable for my project? I'm asking because this sensor is out of stock and I got to find an alternative.
Any 3 axis accelerometer can be used to measure tilt angles.
Any 9DOF sensor can be used to estimate absolute orientation.
for the latest project have switched to the MC3216 3-Axis Accelerometer. The sensor does not have BLE built in - you have to have a microcontroller such as the Nano 33 BLE Sense suggested by @jremington in post #5 which collects data from the sensor and transmits it to the smartphone over BLE for processing. We found sampling the LSM9DS1 every 20mSec worked OK.
Thanks a lot. Do you think one sensor is enough for my project or I need to connect two or more sensors? I mean can a 9DOF sensor on the spine detect improper posture, or I need two sensors on the shoulders.
That was helpful. Thanks
From your comments, it appears that you first need to decide what it is that you want to measure, and how you will go about making those measurements.
That will probably involve quite a bit of learning, research and experimentation. The sensors and microprocessor boards are cheap, so go ahead and get started!
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