I'm about to start an investigation about people movement after a surgery (walk basically). I would like to know where should I start to look for movement sensors (pedometer/accelerometer). This sensor basically has to be installed on the patient and has to monitor his movement.
I need something affordable, efficient, lightweight and non intrusive. I don't know where I should start to search for sensors.
This sensor also needs to be accessed from outside, for example: a custom iOS app that asks for the sensor information and store information on a database on the cloud.
The sensor has to be accessed via wireless (bluetooth or lte) or some kind of api.