@user2684 Hi, I tried NRF51822 with the WaveShare dev board (https://www.waveshare.com/wiki/BLE400).
I can use his integrated cp2120 to see the serial output (no need to do any special coding, it works out of the box if we use the proper board when uploading our sketch).
I'm using a SSD1306 lcd working properly, using the proper library (https://github.com/beegee-tokyo/nRF52_OLED) and connecting the lcd to the SCL and SDA pins (P.01,P.02).

The only thing I'm still trying to make it working is the Door sensor. Using Nodemanger is not working for me.