Circuitry refrence:

LCD circuitry:

pin 15 on the LCD may need a resistor but with my experience it is not necessary.

Images from: https://learn.sparkfun.com/tutorials/sparkfun-inventors-kit-experiment-guide---v41/circuit-4a-lcd-hello-world

View the code in action at: https://wokwi.com/projects/376338650472112129

I2C LCD circuitry:

for UNO:

for MEGA:

RGB circuitry:

From: https://learn.sparkfun.com/tutorials/sparkfun-inventors-kit-experiment-guide---v41/circuit-1d-rgb-night-light

DC motor Circuitry:

based off images from: https://learn.sparkfun.com/tutorials/sparkfun-inventors-kit-experiment-guide---v41/circuit-5a-motor-basics