The transmitter has electrodes for ECG measurement and an acceleration sensor inside. This SDK establishes a Bluetooth connection between the hitoe transmitter and the smartphone, and uses the ECG and acceleration sensor values measured by the hitoe transmitter to remove the heart rate, measure ECG noise, and scan. Performs data processing such as spectrum analysis and motion estimation. According to the manual, the target of this SDK was Android 4.4 to 6.0 or iOS 8.1 to 9.0, but it was also available for the latest smartphone Pixel 3a.
The hitoe transmitter has electrodes for ECG measurement and an accelerometer. Here, I used SDK for Android Ver.1.3.0 downloaded around February 2019. The SDK connects between the hitoe transmitter and the smartphone with Bluethooth, processes noise removal and spectrum analysis, and estimates the motion. According to the manual, the target of this SDK was Android 4.4 to 6.0 or iOS 8.1 to 9.0, but I could use it for the latest Android smartphone Pixel 3a.
I used the sample application attached to this SDK. The application required permissions of both storage and location information. We cannot use the emulator including Android Studio because the hitoe library consists of Arm binaries. Debugging is performed on the actual device.
Start this sample program and turn on “Start measurement” at the bottom of the screen to display the sensor selection screen. Select the target hitoe transmitter and enter the PIN number. This PIN number is on the back of the hitoe transmitter.
On the screen of this sample application, LF/HF (it denotes stress degree), connection status, heart rate, electrocardiogram, body direction are shown. This information is recorded on the smartphone internal storage at the same time as is shown. However, it is not suitable for long-term use due to its large amount of data. It is fun to look at the ECG during your exercise.
The SDK has been discontinued on April 26, 2019 and is no longer available.