Up until now I have been planning on a Neopixel ring and a couple of rotary encoders for a user interface. The Neopixel ring works great and I can use different colors for different uses. I have come up with a workable system for entering small numbers and displaying on the ring but I really need an alphanumeric display - at least three or four digits.
In normal operation the three digits would be the processed heading. Several adjustments need to be entered: filter Q, Doppler frequency, averaging, azimuth adjustment, etc.
The typical location for this device is in a car with normal lighting so that's the issue. It needs to be readable in possibly direct or almost direct sunlight. I've ordered a few small paper white displays and a 24 LED ring. Perhaps mounting the paper white display inside the ring. This arrangement would be nice but is awfully expensive for what is needed. Any suggestions?