I got it working thanks to everyone's advice. Using the two wires connected to the ground and io.0in pins, it works perfectly every time. Thanks for the help everyone!

Thanks for the advice everyone. I'll be able to try it in a bit. I appreciate everyone's help!

@alankilian
I agree it should be something simple. I tried placing a wire across the 3.3 to the io0 in pin and the board didn't read it. Below are images of the wiring.

@alankilian
I just tried it but there was no change in the reading. You are correct that I am using the 3.3v for the endstop. I do have the ground connected between the endstop and the board if that matters.

Hi everyone, I'm working on getting a 3D printer up and running with a Duet 3 6HC board. The issue is that I can not get the board to recognize the endstops at all (ender 3 versions). I have taken a multimeter to verify that all my wiring for them is continuous and that the end stop completes the circuit when actuated. The wiring also has been shielded with aluminum foil to prevent any interference with the stepper motors.

Firmware: 3.3

Below is the code for my config file. (Eventually, I will enable the dual z motors, but I wanted to get XY motion done first. That is why there is a commented out stepper motor). I have also tried all of the endstops connected at once and one at a time, with no difference

; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Thu Jul 15 2021 14:31:46 GMT-0700 (Pacific Daylight Time)

; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"Propellant Printer"                           ; set printer name

M552 S0 ; Gaurentee Networking Disabled
M552 P192.168.2.10 ; Set static IP at 192.168.2.10
M552 S1 ; Enable networking at static IP

M586 P0 S1                                   ; enable HTTP
M586 P1 S0                                   ; disable FTP
M586 P2 S0                                   ; disable Telnet

; Drives
M569 P0.0 S1                                 ; physical drive 0.0 goes forwards, Extruder
M569 P0.1 S!1                                ; physical drive 0.1 goes forwards, y axis
M569 P0.2 S1                                 ; physical drive 0.2 goes forwards, x axis
M569 P0.4 S1                                 ; physical drive 0.4 goes forwards, z left
;M569 P0.5 S1                                 ; physical drive 0.5 goes forwards, z right
M584 X0.2 Y0.1 Z0.4 E0.0 ; E0.0                     ; set drive mapping
M350 X16 Y16 Z16 E16 I1; E16 I1                      ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E420.00   ;         ; set steps per mm
M566 X900.00 Y900.00 Z60.00  E120.00  ;       ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ;      ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00  ;        ; set accelerations (mm/s^2)
M906 X1680 Y1680 Z20.00 E800 I30  ;Z1680              ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                      ; Set idle timeout

; Axis Limits
M208 X0 S1 Y0 Z0 S1                             ; set axis minima
M208 X 210 Y210 Z200 S0                       ; set axis maxima

; Endstops
M574 X1 S1 P"!io0.in"
;M574 Y1 S1 P"!in3.in"
;M574 Z1 S1 P"!io2.in"
;M574 Z2 S1 P"io3.in"


; Heaters
;M308 S0 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp1
;M950 H0 C"out0" T0                           ; create bed heater output on out0 and map it to sensor 0
;M307 H0 B1 S1.00                             ; enable bang-bang mode for the bed heater and set PWM limit
;M140 H0                                      ; map heated bed to heater 0
;M143 H0 S120                                 ; set temperature limit for heater 0 to 120C
;M308 S1 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp0
;M950 H1 C"out2" T1                           ; create nozzle heater output on out2 and map it to sensor 1
;M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit
;M143 H1 S280                                 ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"out4" Q500                         ; create fan 0 on pin out4 and set its frequency
M106 P0 S0 H-1                               ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"!out6" Q500                        ; create fan 1 on pin !out6 and set its frequency
M106 P1 S1 H1 T45                            ; set fan 1 value. Thermostatic control is turned on

; Tools
;M563 P0 D0 H1 F0                             ; define tool 0
;G10 P0 X0 Y0 Z0                              ; set tool 0 axis offsets
;G10 P0 R0 S0                                 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

@phaedrux I started adding items back one at a time. It looks like the PT1000 (thermistor and probe) and the BLTouch no longer work but everything else does. My guess is that one of the two could be the cause of the issue that I was having.
Thanks for the help everyone!

@dc42 @Phaedrux Nothing gets hot when connected over USB. I'm connected to the PSU and the board is working with not issues (I have power cycled everything a few time to make sure). Vin is reported at 24.3 by the board and 23.8 by multimeter. I don't have time to reassemble printer today, but will do that tomorrow port by port to make sure the board will still function. I appreciate your help!

@phaedrux Connecting the board via USB with not connections has it working like it was new out of the box

@phaedrux Okay will do. Just checked PSU voltage, its 24v. Measured it 10 times, 1 a min. range was 23.8-24v

@phaedrux I dont see any damaged comonets on the boar. I'll attach some images.

The high voltage warning came from the duet at 31.4V. It could have come from the power supply. It came from an ender 3. I don't think the PSU has failed. I will have a multimeter later today and check output voltages.

I don't think any items got shorted and there was no sounds of shorting.