Hardware/Feature Requests for vNext (v5?)

[ctacke]

For the next version of Clima, I propose the following features:

1. A fan relay.
   We're using a temp sensor of the board, and having that in the enclosure that could be in the sun could yield data that isn't great. Adding a small 30mm case fan could help.
2. Screw terminals for an external thermistor
   For the reason above, the option of an external wired thermistor would be good
3. A light sensor and light pipe
   Being able to determine if we're in daylight/direct sun may also assist with meadow.core not found in local repository (also Meadow.Foundation not found when present) #1 above
4. A battery-backed RTC
   When the device boots it may or may not have a network connection. If it starts logging data before an NTP time comes in, we need to do math to back-correct those data points, which is not fun.
5. Remove the GPS
   It's used for locating the device, but typically there are fixed-mount so it seems like a lot of BOM cost for a one-time data point that could be achieved in another way
6. 4-pin header for an SSD1306 I2C display
   The ability to optionally plug in a small I2C display is extremely helpful for development and testing.

[jbeenes]

7. Also maybe add the ability to use some free pins to connect some custom hardware. Like the Qwiic I2C connector on the v3 already can be used for (I presume).