Im using Teensy 4.0 to control Adafruits Neotrellis 16 LEd/button board programing it with Arduino Ide. Then solder a wire to connect the resistor to where the trinkets digital pins 0, 1 and 4 will be located when the trinket is connected. ATmega32u4 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2. Interrupt on teensy 4.0 + Adafruits Neotrellis. The final soldering step is to add three resistors, four wires, and a battery connector as follows: For each LED lead except the annode, solder a resistor to bridge the gap between the top and bottom half of the breadboard.
ADAFRUIT TRINKET PIN 0 PRO
This library has been renamed Adafruit_LiquidCrystal so as not to conflict with LiquidCrystal.