I am working on a project to add LED lights to my DIY 3d printer, which is running RAMPS 1.4 and Marlin firmware. I am trying to come up with a design that allows me to connect a Neopixel to an Arduino trinket, and the trinket to the RAMPS board to detect temperature changes so I can change lights. Rather than use I2C, and to keep the solution as simple as possible, I was hoping to connect the trinket to the RAMPS board using a serial port, and communicate via GCode- eg. using the M105 command, which gives me the temperature of the nozzle and bed.I think all of this is possible based on some initial research. However, I’m not sure what my options are for connecting to a serial port on the RAMPS board. Is anyone familiar with doing something like this that could help point me in the right direction? http://ift.tt/2dHyWUP