I have a couple of variables that must be continuously updated, but they must be updated at different rates and through different functions. I have been using a daemon.g file to run simple looping metadata commands based off of a custom linear-analog sensor for ease of data analysis, but I now require a way to run another simple set of commands over a longer period of time without largely impacting the speed of the current set of commands. Currently running on 3.5.1, and efforts made with M596 have been unsuccessful so far. I realize the duet system is still essentially a one stack system, I am just hoping for an quicker solution than incorporating extra computers or micro controllers that I have overlooked.

In other words, is there a a way to run two separate background while loops at different rates, either in a daemon file or some other method? Perhaps some creative queue meshing method? There are no macros included, all M-commands, one loop designed to run at half a second, the other ideally over a full second.

@dc42 I see! That fixed all of my issues, thank you.

I have encountered a couple errors that I do not know how to fix, the most pressing one being this "DEFHJPSR". Should I be worried?

Also, a linear-analog sensor I had set up in an io port had a lower than desired value output, but when trying the Uu/Vv parameters for the M308 command with values U0 and V1, the "too high" error in the picture come up. Any solutions or oversights?

@Duet_Science_Application

Thanks again for getting back to me. I tried your solution of switching to different Q values, but the output is still the same at 24V AC. I probed the black component located next to the pins (assuming that this was the protective diode that possibly is failing) and noted that it is allowing the same current in both directions, while the other two components for the pins next to it allow current preferentially in one direction. This leads me to suspect a component failure over coding issues.

Hello,

I am a researcher looking to use the Duet chip family to build some niche application machines. To that end, I am using a Duet 6HC and 3HC expansion for a custom machine in my lab. My team and I are attempting to use a solenoid defined with M950 as a "Fan" type device (the solenoid in question is a 24V 4.8W DC) on output pin 3 (we ordered a 12V and 24V solenoid, but the 12V was used elsewhere); I am new to electronics, but given the solenoid is DC, I thought setting the Q parameter to 0 would enable simple control of the solenoid with DC voltage instead of PWM control.

Prior to today, we had run the solenoid with "M106 ... Q500 X.3" command and had no issues getting it to trigger, but wanted to ensure we were operating the solenoid properly for long term operation before moving on to the next task (again, assuming that the proper way to drive the solenoid was not with PWM).
After setting the Q parameter to 0, I attempted to run the above M106 command. The solenoid opened and stayed active, but attempting to turn off the "fan" with M106 shutoff command no longer works. Looking at the output of Output 3 with a multimeter now shows that 24V DC current is being outputted from the Output 3 pins.

My current thought is that the something has happened on the board that now causes it to only output 24V DC instead of on/off PWM. Given the mismatch between the usual 12V output and the 24V of the solenoid, I suspect that too much power was returned to the solenoid and a safety componet was tripped. Looking at the 6HC pinmap
I believe the "V_fuse" has been blown and is now freely allowing 12V passed through the pins, but this is only my thoughts and could very well be wrong.

Can anyone direct me to more resources or ideas on how to fix the Output 3 voltage coming out? I have tried to look for where V_fuse is located, but have not had much success looking online. Visual inspection of my fuses seems to indicate no failures from what I can see, but direct testing the connections is next.

Here is my config.g file, with the "fan"/solenoid in question being defined as the M950 "out3" line

; Configuration file for Duet 3 MB 6HC (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.4.0 on Fri Dec 29 2023 12:02:51 GMT-0700 (Mountain Standard Time)

; General preferences
M575 P1 S1 B57600                                           ; enable support for PanelDue
G90                                                         ; send absolute coordinates...
M83                                                         ; ...but relative extruder moves
M550 P"2D Exfoliator"                                       ; set printer name

; Wait a moment for the CAN expansion boards to start
G4 S4

; Network
M551 P"2D"                                                  ; set password
M552 P0.0.0.0 S1                                            ; enable network and acquire dynamic address via DHCP
M586 P0 S1                                                  ; enable HTTP
M586 P1 S1                                                  ; enable FTP
M586 P2 S1                                                  ; enable Telnet

; Main Drives
M569 P0.0 S1                                                ; physical drive 0.0 goes forwards, for X
M569 P0.2 S0                                                ; physical drive 0.2 goes backward, for Z
M569 P0.3 S1                                                ; physical drive 0.3 goes forwards, for E1
M569 P0.4 S1                                                ; physical drive 0.4 goes forwards, for E2

; Extension Drivers
M569 P2.0 S1                                                ; physical drive 1.0 goes forwards, for U
M569 P2.1 S1                                                ; physical drive 1.1 goes forwards, for V
M569 P2.2 S0                                                ; physical drive 1.2 goes backward do to reverse wiring, for W

; Set main board motor configuration											
M584 X0.0     Z0.2     E0.3:0.4                             ; set drive mapping
M350 X16      Z16      E16:16          I1                   ; configure microstepping with interpolation
M92  X640.00  Z5039.37 E30.85:30.85       					; set steps per mm
M566 X600.00  Z60.00   E120.00:120.00      					; set maximum instantaneous speed changes (mm/min)
M203 X3000.00 Z180.00  E1200.00:1200.00  					; set maximum speeds (mm/min)
M201 X500.00  Z20.00   E250.00:250.00 			 			; set accelerations (mm/s^2)
M906 X2000    Z2000    E2800:2800      I30           		; set motor currents (mA) and motor idle factor in per cent
G92  Y0                                                     ; not using Y, just removes homey error
; Set extension board motor configuration
M584 U2.0    V2.1     W2.2									; set drive mapping on extention board to 0, 1, and 2
M350 U16     V16      W16	   I1								; configure microstepping with interpolation
M92  U640.00 V640.00  W5039.37     							; set steps per mm
M566 U600.00 V600.00  W60     								; set maximum instantaneous speed changes (mm/min)
M203 U3000   V800.00 W180   								; set maximum speeds (mm/min) ; NOTE: appears that there is a speed limitation for V motor, anything above around 1000mm/min results in motionless reving 
M201 U500.00 V50.00  W20.00    							; set accelerations (mm/s^2)
M906 U2000   V2000    W640     I30            				; set motor currents (mA) and motor idle factor in per cent, .64A max for small motor -Josh 
M84  S20                                                    ; Set idle timeout

; Axis Limits
M208 X0:290 Z0:65                                           ; set axis min:max main board
M208 U0:178 V0:141 W0:33                                    ; set axis min:max extension board

; Main Endstops
M574 X1 S1 P"io1.in"                                        ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io1.in
M574 Z2 S1 P"io2.in" 										; configure switch-type (e.g. microswitch) endstop for high end on Z via pin io2.in
; Extension Endstop
M574 U0 S1 P"2.io0.in"                                      ; configure switch-type (e.g. microswitch) endstop for low end on U via expansion board pin 1.io0.in 
M574 V0 S1 P"2.io1.in"                                      ; configure switch-type (e.g. microswitch) endstop for low end on V via expansion board pin 1.io1.in 
M574 W0 S1 P"2.io2.in"                                      ; configure switch-type (e.g. microswitch) endstop for low end on W via expansion board pin 1.io2.in  

; Z-Probe
M558 P0 H1 F120 T6000                                       ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:195 S20                                            ; define mesh grid

; Heaters
M308 S1 P"temp1" Y"thermistor"                              ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                                          ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S0.1                                             ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S50                                                 ; set temperature limit for heater 1 to 40C

; Fans

; Tools
M563 P0 S"Heater" D0:1 H1 F0                                ; define tool 0
G10 P0 X0 Z0                                                ; set tool 0 axis offsets
G10 P0 R0 S0                                                ; set initial tool 0 active and standby temperatures to 0C
M567 P0 E1.0:1.0                                            ; set extrusion ratio
M302 P1                                                     ; allow extruder to operate at any temp

; Custom settings are not defined
;Vacuum Solenoid 
M950 F1 C"out2" Q500                                         ; maps "Fan1" to output 2 pin, where "fan1" is solenoid valve. out2 is PWM pin, so Q500 might need to be adjusted to control the valve correctly
M950 F2 C"out3" Q0

; maps "Fan1" to output 2 pin, where "fan1" is solenoid valve. out2 is PWM pin, so Q500 might need to be adjusted to control the valve correctly

;M106 P1 S0 H-1 X0.1      ; set fan 0 value. Thermostatic control is turned off (H-1 param)-> no feedback from heater system, X set PWM%

; Miscellaneous
M308 S6 P"!io6.in" Y"linear-analog" A"Pressure Sensor" F0   ; configure io6 pin to be a sensor we named Pressure Sensor
T0                                                          ; select first tool

;Set gloabl variables
;renamed from myVar to Pressure, also made creating a global var more robust -Josh
if !exists(global.Pressure) || global.Pressure=null
	global Pressure=0
else 
	set global.Pressure=0   


;lobal daemon_iter = 0                                   ;setting global daemon variables```