Welcome to the forum for MobiFlight! Feel free to reach out to the community in case you have questions, issues or just want to share great ideas or details about your latest home cockpit project.
You like MobiFlight? Donate via PayPal and support the MobiFlight development. Thanks!
1. A MEGA board can max drive 500mA. But you should drive it with less
2. Do you mean a single LED or a Segment of a 7-Segment-digit?
If you buy LEDs with high brightness ( >10000 mcd) then you can drive a LED with 6 - 12 mA (you should test the brightness)
The LED- segments from a 7-Segment LED on a MAX chip were drive with 40mA each. But the segments are multiplexed with a frequency of 1000Hz, so that the 40mA not fully
affect. You can reduce the power consumption if you change the 10kohms resistance (R1 - 103) on the MAX-board to 20 ... 47 kohms.
3. You do not mean LED but LCD. You should buy the first in the variant blue (without I2C) and a separate I2C module because the variant with the built in I2C module is without the possibility to program another I2C address. It's a bit more expensive but you are much more flexible if you use 2 LCD modules on one MEGA board.