Bluetooth Low Energy IOT

Radioland  BLE beacon module datasheet: https://www.renhotecic.com/image/download/pdf/2020031603025251822beacon.pdf can be reprogrammed with Arduino IDE and ST Link V2  to special remote button  application. SWDIO     ->   SWDIO SWCLK     ->   SWCLK 3.3V            ->   BAT+ GND          ->   BAT- 3D printed cover for BLE module:   Arduino IDE libraries for NRF51822  and instructions can be found from: https://github.com/sandeepmistry/arduino-nRF5 Nrf51822 Bluetooth low energy stack (Softdevice)  version S130 is required to download and flash to device  before BLE application software can be programmed : Selecting a SoftDevice SoftDevices contain the BLE stack and housekeeping, and must be downloaded once before a sketch using BLE can be loaded. The SD consumes ~5k of Ram + some extra based on actual BLE configuration...

Cheap and simple DIY bluetooth low energy digital oscilloscope made with JDY-08 BLE module and STM8S103 module and Li ION battery. Android application is developed to display oscilloscope data.  STM8S103 is 8-bit microcontroller with 1024 bytes RAM and 8 kbytes Flash memory. It stores 300 samples of 10 bit ADC data to RAM memory. Minimum sampling period is 5 us (200 kSamples/s).  ADC data is sent trough BLE lin k to Android smartphone application.  Circuit diagram