I have an older version Duet Wifi:
-Hdwr version 1.0.
-Power Vin = 12vdc
-Firmware v3.3
After upgrading the firmware to 3.3, everything worked fine. However, I had a very slow "Bed Heater" and wanted to speed the heat cycle up by going to 24vdc (Bed Heater was always slow even before the firmware upgrade- thought now would be a good time to change that). Didn't see anything that said this wouldn't work as the Duet3d Wifi board appeared to be spec'd up to 24vdc input.
I my system up to 24vdc and everything appeared to work, the bed heated up much quicker and was stable at just under 5amps. I shut the system down for the night. Today the unit came online but the DWC shows both temperature sensors are reading +2000 deg.
I changed the power Vin - reverted back to 12vdc and the DWC shows a reading -273.1 deg. I check my thermistor readings and they are fine. I removed the two thermistors from the connector and the readings don't change... still -273.1deg. My 5v and 3.3v LEDs are on, NO fault light, and I can home my all three axies. I have included my M122 readings:
*******************************M122 starts here **************************************
m122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.3 (2021-06-15 21:44:54) running on Duet WiFi 1.0 or 1.01
Board ID: 08DAM-999TL-MQ4SD-6J1F6-3S46N-TNB7Y
Used output buffers: 3 of 24 (12 max)
=== RTOS ===
Static ram: 23876
Dynamic ram: 75292 of which 0 recycled
Never used RAM 15248, free system stack 184 words
Tasks: NETWORK(ready,14.2%,237) HEAT(delaying,0.0%,342) Move(notifyWait,0.1%,364) MAIN(running,85.6%,442) IDLE(ready,0.1%,29), total 100.0%
Owned mutexes: WiFi(NETWORK)
=== Platform ===
Last reset 00:30:06 ago, cause: power up
Last software reset time unknown, reason: User, GCodes spinning, available RAM 15248, slot 2
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x00400000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
Step timer max interval 0
MCU temperature: min 24.4, current 30.9, max 31.7
Supply voltage: min 0.6, current 1.7, max 1.8, under voltage events: 0, over voltage events: 0, power good: no
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Driver 0: position 0, ok, SG min/max not available
Driver 1: position 0, ok, SG min/max not available
Driver 2: position 0, ok, SG min/max not available
Driver 3: position 0, ok, SG min/max not available
Driver 4: position 0, ok, SG min/max not available
Driver 5: position 0
Driver 6: position 0
Driver 7: position 0
Driver 8: position 0
Driver 9: position 0
Driver 10: position 0
Driver 11: position 0
Date/time: 2021-10-05 23:49:27
Cache data hit count 4294967295
Slowest loop: 8.72ms; fastest: 0.12ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 1.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 83, maxWait 0ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 15.44ms; fastest: 0.00ms
Responder states: HTTP(2) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
HTTP sessions: 1 of 8
- WiFi -
Network state is active
WiFi module is connected to access point
Failed messages: pending 0, notready 0, noresp 0
WiFi firmware version 1.26
WiFi MAC address 60:01:94:08:f0:7a
WiFi Vcc 3.38, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 25024
WiFi IP address 192.168.1.192
WiFi signal strength -42dBm, mode 802.11n, reconnections 0, sleep mode modem
Clock register 00002002
Socket states: 0 0 0 0 0 0 0 0