RaspberryPi Zero W

I came across a RaspberryPi Zero W, the older generation RPi Zero with WiFi.  For $10, it is a great little board.  Although it can run the desktop environment, it cannot really be expected to run the memory intensive applications such as internet browser because of limited memory.  But 512MB is a huge amount of memory for embedded systems.  To run the camera, it needs to allocate 128MB to the GPU (perhaps 64MB if only still picture).

It is straightforward to wiring up a display module.  And with the python module luma.oled, the display is up and running quickly.