Hi, I would like to receive some suggestion about finding a CHEAP smartwatch / wristband already available that has these minimal features: BLE (with SDK / GATT profiles), Heart Rate and Accelerometer.
I can find many devices (su $30) with nRF51822 with Heart Rate + Pedometer (usually based on G Sensor kx022-1020), but I can't find documentation (even unofficial) to understand if it is possibile to get raw data.
The only reliable solution I have found would be from mbientlab but they are procrastinating their MetaHealth (not so cheap, considering that I need to add a case and a wristband).
Any suggestion?