WB-LED firmware changelog

Overview

Device firmware can be updated over Modbus; see the instructions.
This page lists changes since the beginning of 2022. Earlier changes are in Firmware Changelog.

Changelog

3.9.2 (11.08.2026)

• Fixed a bug that stopped the device from sending Fast Modbus events ERRMODBUS012

3.9.1 (29.07.2026)

• Fixed writing values above 255 s to the communication loss timeout register for entering safe mode (register 8)

3.9.0 (13.07.2026)

• Added service coil register 65500 for LED testing.

3.8.1 (30.06.2026)

• Improved Fast Modbus arbitration timing stability
• Fixed Modbus issues:
  • ERRMODBUS008: Unexpected behaviour with long request frames
  • ERRMODBUS009: Unexpected behaviour when reading near address 0xFFFF in continuous-reading mode
  • ERRMODBUS010: Incorrect request validation and handling of invalid requests
  • ERRMODBUS011: Incorrect handling of invalid Fast Modbus event-configuration requests

3.8.0 (11.06.2026)

• Added encoder support
• Added configurable dimming steps for single and double short presses
• Added smooth dimming control from remote buttons
• Added duplicate control channels with automatic switch-on
• Fixed event loss when two devices on the same bus transmit events simultaneously. ERRMODBUS007
• Fixed continued hue animation after entering safe mode
• Added 2CCT operating mode

3.7.1 (25.03.2026)

• Optimised filesystem operation
• Optimised power-loss handling

3.7.0 (20.02.2026)

• Added CCT strip power normalization (fixed issue ERRLED0005)

3.6.1 (30.01.2026)

• Fixed differing PWM phases between channels in 4*W mode ERRLED0002
• Fixed parallel-connected channels recovering separately after overcurrent protection trips ERRLED0003
• Fixed unsynchronized PWM updates for parallel-connected channels ERRLED0004

3.6.0 (24.12.2025)

• Added stack and RAM monitoring service registers
• Added a service register for the last MCU reset cause
• Added a firmware update counter service register
• Improved MCU supply voltage measurement accuracy on new devices
• Added device batch number registers

3.5.6 (26.05.2025)

• Simplified hardware by removing EEPROM

3.5.5 (22.04.2025)

• Fixed hardware overcurrent signal handling when the signal remains active after a trip (for example, due to a failed switching transistor)

3.5.4 (24.03.2025)

• Fixed input actions in maintained-switch mode (broken in firmware 3.5.3)

3.5.3 (12.03.2025)

• Added a register to restore default settings
• Fixed power-on and safe-mode actions ERRMRGBW-D05
• Removed unused and incorrectly functioning press-type action configuration registers ERRMRGBW-D06
• Fixed channel level loading at device power-on ERRMRGBW-D07
• Fixed the Input control in safe mode setting ERRMRGBW-D08
• Fixed unexpected behaviour when invalid values are written to some registers ERRMODBUS003

3.5.2 (31.01.2025)

• Fixed the Switch all off action in maintained-switch mode
• Updated system libraries

3.5.1 (11.11.2024)

• Added parity checking for received Modbus data ERRMODBUS006

3.5.0 (25.09.2024)

• Added safe modes
• Added power-on actions
• Added maintained-switch support

3.4.4 (05.08.2024)

• Added a register for minimum MCU supply voltage since power-on
• Fixed rare possible freezes at power-on
• Fixed replies to address 0xFD packets that did not contain Fast Modbus commands ERRMODBUS001
• Fixed reading different coils in one request ERRMODBUS005
• Fixed a bug allowing output configuration register values above the PWM resolution

3.4.3 (19.01.2024)

Added Fast Modbus events:

• for RGB mode colour registers when RGB or HSV changes
• when brightness increases from zero and the channel coil switches on.

3.4.2 (28.11.2023)

• Added Fast Modbus events for channel control registers: coils [0..10] and holdings [2000..2017]
• Fixed the response to discovery command 0x46 ERRMODBUS002
• Fixed uninitialised high bits in bit-field replies ERRMODBUS004
• Added register 131: enter the bootloader with current connection settings. Requires bootloader 1.3.0 or later.

3.4.1 (12.09.2023)

• Accelerated supply-voltage response in register 121 by reducing the RC filter time from 500 to 50 ms
• Added register 125: unfiltered supply voltage in mV

3.4.0 (31.07.2023)

• Added events for press and input closure counters
• Discontinued support for WB-MRGBW-D revisions up to and including v8.0J (signature mrgbw).

3.3.4 (15.12.2022)

• Fixed software handling of overcurrent protection trips (broken in 3.3.1)
• Fixed V_IN low-pass filter initialization

3.3.3 (05.12.2022)

• Minor Modbus fixes

3.3.2 (16.11.2022)

• Updated the Modbus library: fixed rare device reboots during communication while saving settings
• The HSV-S decrease time (register 3112) used the wrong value (from HSV-V)
• Fixed RGB-to-HSV conversion when R == G == B, which produced invalid HSV values and prevented HSV palette operation
• Increased debounce time to 2000 ms

3.3.1 (27.10.2022)

• Fixed stop-bit register reading for backward compatibility; operation was unaffected because the device does not use this setting

3.3.0 (13.10.2022)

• Added master-switch functionality: Switch all channels off is now available in the action list.
• Fixed channel indication: the status LED did not light when a channel raw PWM value was a multiple of 256.

3.2.2 (11.08.2022)

• Fixed current-state saving: state could occasionally be lost on power failure.

3.2.1 (03.08.2022)

• Fixed data compaction before firmware updates: the device could sometimes freeze while entering the bootloader.

3.2.0 (01.08.2022)

• New Modbus implementation:
  • support for response-time register 113; very fast replies when set to 0. Can be used efficiently with the scheduler wb-mqtt-serial;
  • support for continuous reading, enabled in register 114.
• Reworked serial numbers for internal purposes.
• Reworked settings storage in flash memory

3.1.0+wb1 (14.09.2022)

• Added support for new EEPROM chips

3.1.0 (05.07.2022)

• Added WB-LED and fourth-input support
• Added board temperature and available-power registers
• Added thermal protection: the device reduces power at high temperatures to prevent overheating

3.0.4 (03.04.2022)

3.0.3 (25.03.2022)

3.0.2 (15.03.2022)

3.0.1 (10.03.2022)