Arduino Fasttrax board

 Whenever I start on an new idea with an Arduino, I end up with a breadboard with pretty much the same 2-3 circuits , connecting standard stuff like LEDs, relays, buttons, displays, and sensors.

So my idea was to make a generic board that had most of the frequently used circuits prepared, so that I could start concentrating on my idea with as little preparation as possible.

My first board , had 2 LED's, 2 buttons, 2 relays, and pins for an analog sensor, (this later developed to the board that was used  in the plant watering system) 

A few friends tested some leftovers from earlier productions, and made some suggested, tips, fails, and new interesting stuff to quickly connect to  in future projects

This shows the 2.2 version of the board

 

Currently a version 2.4 is under way, with some rearrangements and in particular some new stuff to support even more expansions boards.
It also includes the possibility to add a lithium 3.7 battery to drive the sim800L board, as the limited 5 volt from the board was not able to supply the Sim800L board sufficient. 
On the silk print, resistor values are changed from ex. R9 to ex. 4K7 , to make the board more self explaining.

I expect version 2.4 to include:

* Vcc IN 4.5-21volt (12 volt optimal)
* 2 LEDs
* 2 set of pins for buttons
* 2. Relays - to control for ex. 240 Volt 
* 2 set of pins for Analog sensors
* sockets to directly mount a Sim800L board (GPRS GSM module )
* sockets for nRF24L01 (2.4 GHz transceivers module)
* socket for I2C OLED display
* set of pins for SPI module
* set of pins for other I2C modules

Please comment below, I you have ideas to projects with this board or if you have an idea to what is missing on the board.