The current limitations of Arduino UNO are:
- 20mA for each Pin
- 200mA in total, sum of all pins
That means we can connect one led to each of the pins with no problems, and have 10 of them illuminated at the same time.
I had the following signal bridge. It has 4 light signals of 3 aspect each one:
I connected each of the led (4 signals x 3 aspects = 12 led) to Arduino UNO. On top of Arduino there is the GCA185 Loconet Shield, and on the top of the shield a self development board where I soldered screw terminals to make the connections easy:
And that's all needed to control your light signals through Loconet: Arduino UNO (3€), Loconet Shield (15€), development shield (2€). Just 20€ and you can manage 16 outputs. If more load is needed in each pin, you can always use a MOSFET board and supply the needed current through an external power source.
In my case, the power to light leds comes directly from the Loconet connector.
I hope you liked it!!