BluePill (STM32) BLE oscilloscope

 Bluetooth Low Energy wireless interface can be used to transfer measurement data to Android smartphone.  My simple digital oscilloscope is done with 

 STM32F103C8T6 Core Board Development Board Bluepill

and Bluetooth low energy module  HM-10 :

Kicad drawn schematic diagram for this bluetooth low energy oscilloscope :

Designed also PCB in Kicad and was able to show these 3D images:

Kicad project is included in GitHub repository:

https://github.com/joukohak/stm32_blescope

Repository also includes  STM32 CubeIDE project  and  Android  apk.

Implemented hardware and 3D printed cover like this:

STM32 firmware was developed in Linux Mint PC with STM32 CubeIDE developement application and interface was ST Link V2:

Android application was developed with Android Studio.

Some screen captures of Android application:

Features include:

- AUTO triggering

- Single trigger

- START trigger rising/falling trigger level setting on channel 1

- 2 channel 1000 samples with period setting from 0.5us to 15ms (2MSps to 16.7 Sps).

- AC/DC select

- sine/triangle wave generator

- Max/Min / trigger Voltage display