Hello,
I'm trying to use FSRs as a z probe and have them mounted on my bed. However, I get the error "G28 Z Error: Probe already triggered at start of probing move" immediately upon trying to home my Z. I'm using a 10k potentiometer, but tuning the resistance on it seems to have no effect. Here is how I have it wired and my config. g.
; Configuration file for Duet WiFi (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.15 on Sun Mar 12 2023 14:20:36 GMT-0400 (Eastern Daylight Time)
; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"FSR Test Bench" ; set printer name
; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet
; Drives
M569 P0 S1 ; physical drive 0 goes forward
M569 P1 S1 ; physical drive 1 goes forward
M569 P2 S1 ; physical drive 2 goes forward
M584 Y0 X1 Z2 ; set drive mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M92 X80.0 Y80.0 Z400.00 ; set steps per mm
M566 X900 Y900 Z60.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180.00 ; set maximum speeds (mm/min)
M201 X500 Y500 Z20.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; set idle timeout
; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X100 Y100 Z100 S0 ; set axis maxima
; EndStop
M574 X1 S1 P"xstop"
M574 Y1 S1 P"ystop"
M574 Z1 S2 ;define Z probe as low end
; Z-Probe
M558 P1 C"!^zprobe.in" H5 F100 ;mode 1 on z-probe in
G31 P500 X0 Y0 Z0.7 ;set trigger value, xy offsets, and Z trigger height
;M557 X0:20 Y0:20 P2
and homez.g in case
; homez.g
G91 ; relative positioning
G1 H1 Z-205 F1800 ; move Z down until the endstop is triggered
G30