Just played around with the I2C header and some OLED displays. In doing so I wrote some simple code that'll show the mean energy spectrum and also the mean measured activity. All of this stuff is already uploaded to GitHub with the newest firmware release!

By default, SSD1306 OLEDs are all supported without big changes to the firmware. Out of the box, 128 x 64 px displays work immediately and will be automatically used when plugged in. The rest of the device works as usual over the serial interface.

Here are some photos of my test run with two tiny LYSO scintillators that contain the radioactive isotope Lu-176. Although the display is tiny and the energy range pretty wide (up to ~3500 keV), you can clearly see the distinction between the two ~200 and ~300 keV peaks :)