I am currently having an issue with DO's on an Arduino in a constant state of high with a pull down resistor attached to a ground plane. Voltage being measured on the DO is 3v. Pull down resistor is 2.2kohm. Below is the wiring diagram of the entire circuit. Looking for suggestions on where I went wrong with this or possible solutions. Currently was thinking of either using a larger resistor array or putting a diode between the resistors and ground plane.
This is my first big project with the Arduino so any feedback is appreciated.