here is the arduino nano, on the board that i made for it. on it i have the power inputs, thermistor inputs, led status outputs, 3 pwm outputs are moved to the edge for the heater controller. and the tx rx and grd brought to the edge for communication for arduino mega.
i decided to use 3 tricolor led's just because i had a few to spare, they are all on the same outputs. so they all turn the same colors at the same time. i am planning on using it to show the temps with the colors blue for cold, green for good, and red for too hot. i think this will be a good way to show the heat status at a quick glance. that is the idea any how.
this is the back of the board
but so far i do like the arduino nano its small and has the same cpu has its bigger brother.
but i am waiting on a few parts again, but i have a few more idea brewing still so i will post more soon.