LSC Tuya Dimmer Fast Response with OpenBeken: Rotary Encoder and Button Latency Fix

User question

How to make this dimmer work well with openbeken and have it react faster when turning the rotary encoder or pressing the button

Artificial Intelligence Response

Direct answer to the question

• Make the Tuya side deliver input events as fast as possible, keep the serial link uncongested, and avoid flooding MQTT when you spin the knob.
• In OpenBeken (OBK), enable TuyaMCU, fake the “Wi‑Fi connected” state for the Tuya side, verify the correct baud rate, link the right dpIDs to channels, and rate‑limit MQTT publishes so encoder bursts don’t backlog the CPU and broker.
• Be aware: on most LSC/Tuya dimmers the rotary encoder and push‑button are wired to a secondary MCU (TuyaMCU). That chip debounces/detects single/double‑clicks before OBK ever sees them, so a small latency on button single‑click is inherent and cannot be removed in OBK. (elektroda.com)

Key points

• Use TuyaMCU driver with dpID→channel links; set “connected” state: tuyaMcu_defWiFiState 4. (elektroda.com)
• Confirm/optimize UART speed (9600 or 115200 bps, device‑dependent). (elektroda.com)
• Reduce network/CPU load from fast rotations: mqtt_broadcastInterval (and only if you really need periodic state, Flag 2 to force periodic broadcast). (elektroda.com)
• Update to a current OBK build and keep logging level moderate.

Detailed problem analysis

• Architecture and where the lag comes from
  • Two‑MCU path is typical: the encoder and push‑button sit on a small Tuya MCU; OBK runs on the BK7231 (WB3S/WB2L, etc.). Encoder turns and button clicks are first processed by the Tuya MCU, then sent over UART to OBK as Tuya dpIDs. This allows the small MCU to run ultra‑low power or handle timing locally, but it also means OBK cannot change the MCU’s internal debounce or double‑click timeout. (elektroda.com)
  • Practical impact:
  • Rotary: usually fast if the UART is set correctly and OBK is not CPU/network‑bound.
  • Button: single‑click latency is often the Tuya MCU waiting to see if a second click occurs (typ. a few hundred ms). OBK receives “single‑click” only after that window closes; that delay is not in OBK. (elektroda.com)
• OBK/Tuya link and dpIDs
  • OBK’s TuyaMCU driver consumes dpID frames from the Tuya MCU and exposes them as channels. You must link the correct dpIDs (boolean ON/OFF and numeric brightness). You can discover dpIDs quickly by asking the Tuya MCU to dump state. (elektroda.com)
• Bottlenecks to eliminate
  • Tuya side “Wi‑Fi state” routines: some Tuya firmwares waste cycles (and sometimes beep/blink) when they think Wi‑Fi/cloud is not connected. Faking a connected state removes that overhead and makes controls feel snappier. Command: tuyaMcu_defWiFiState 3 or 4 (4 = cloud/wifi connected). (elektroda.com)
  • UART throughput/mismatch: wrong baud means queued frames and visible lag in OBK. Confirm with tuyaMcu_setBaudRate 9600 or 115200 as appropriate for your unit. (elektroda.com)
  • MQTT flood from the encoder: spinning the knob can produce many brightness steps. If every step is published immediately to MQTT and Home Assistant, the device and broker may backlog, creating apparent “rubber‑banding.” OBK supports throttling the broadcast interval; set a short, fixed interval so bursts are coalesced. (elektroda.com)

Current information and trends

• LSC Smart Dimmer/Action devices confirmed to use a small Tuya MCU in front of BK7231; encoder events wake/report to the Wi‑Fi side via serial. This hardware split is why on‑device click latency can’t be fully eliminated in OBK. (elektroda.com)
• OBK project continues to add TuyaMCU quality‑of‑life commands such as dpID discovery (tuyaMcu_sendQueryState) and stable dpID→channel linking at boot, useful to verify mapping for your dimmer. (elektroda.com)
• MQTT publish interval controls are available and commonly used to tune Home Assistant charting/traffic; they also help keep encoder bursts responsive. (elektroda.com)

Supporting explanations and details

• Recommended minimal autoexec (adjust dpIDs to your device)
  • Purpose: start TuyaMCU, ensure Tuya side is “connected,” set baud, link outputs, and avoid serial/network storms.
  • Example:
  • startDriver TuyaMCU
  • tuyaMcu_defWiFiState 4
  • tuyaMcu_setBaudRate 115200 (or 9600 if your logs show 9600)
  • linkTuyaMCUOutputToChannel 1 bool 1 (dpID 1 → channel 1 ON/OFF)
  • linkTuyaMCUOutputToChannel 2 val 2 (dpID 2 → channel 2 brightness)
  • mqtt_broadcastInterval 5 (coalesce rapid updates to ~5 Hz)
  • save; reboot
  • dpIDs vary; find them by:
  • tuyaMcu_sendQueryState
  • then GET http://device_ip/cm?cmnd=DP or see MQTT DP JSON to list them. (elektroda.com)
• Why faking Wi‑Fi state helps
  • It stops the Tuya MCU from spending time in pairing/status loops and makes it prioritize input processing and UART comms. This is a common fix for beeping/slow controls immediately after flashing. (elektroda.com)
• Why MQTT throttling improves “feel”
  • The light responds locally as soon as OBK sets the channel. The perceived lag often comes from the web UI/HA slider catching up through a flood of messages. A short interval (e.g., 5–10 Hz) sends the latest state quickly without queue buildup. (elektroda.com)

Ethical and legal aspects

• Mains dimmers: if you are working on a mains‑powered triac dimmer variant, follow electrical safety procedures and local code. Do not modify wiring unless qualified. Battery/low‑voltage wall controllers don’t carry mains risk but still require safe handling.

Practical guidelines

• Step‑by‑step
  1. Update OBK to a recent build for your chip.
  2. In Console: startDriver TuyaMCU; set tuyaMcu_defWiFiState 4; set correct tuyaMcu_setBaudRate; save; reboot. (elektroda.com)
  3. Discover and link dpIDs; verify ON/OFF and brightness update instantly in the OBK web panel. (elektroda.com)
  4. Set mqtt_broadcastInterval 5–10 to prevent floods on fast rotations. Only enable periodic “broadcast even if unchanged” (Flag 2) if you need rigid periodic telemetry; otherwise leave it off. (elektroda.com)
  5. Reduce log verbosity (no debug spam during testing).
  6. Measure: watch Console timestamps for “TuyaMCU RX dpID …” and confirm they appear immediately on knob turns; if they do but HA lags, your bottleneck is MQTT/HA, not Tuya.
• What you cannot fix in OBK
  • The Tuya MCU’s double‑click window for the push‑button; expect a short delay on single‑click toggle. Some devices expose no direct GPIO for the button/encoder to OBK, so scripting OnClick/OnHold in OBK won’t apply. (elektroda.com)
• If your unit is the battery‑powered LSC wall controller version
  • The same TuyaMCU principles apply; ensure the Tuya port is stable and “Wi‑Fi connected” is asserted so wake→report cycles are prompt. (elektroda.com)

Possible disclaimers or additional notes

• Commands sometimes change names or gain options across releases. If a command is not accepted, verify on the device’s /help or check the current commands list in the OBK docs/repo. (github.com)
• mqtt_broadcastInterval and Flag 2 affect reporting cadence, not the internal dimming loop. They do not slow the light; they prevent message storms that can make the UI feel slow. (elektroda.com)

Suggestions for further research

• Identify your exact dpIDs and log a short knob spin to quantify timing end‑to‑end (Tuya RX → OBK channel set → MQTT publish).
• If you suspect the Tuya MCU isn’t pushing updates, schedule a periodic tuyaMcu_sendQueryState (e.g., every 60 s) as a fallback, though most dimmers push brightness changes themselves. (elektroda.com)
• For hardware hackers only: on some designs the encoder can be rewired to the Wi‑Fi SoC pins for direct handling, but this is model‑specific and voids safety approvals.

Brief summary

• Configure TuyaMCU correctly, fake Wi‑Fi state 4, confirm the proper baud, and link dpIDs for on/off and brightness. Then coalesce rapid MQTT publishes to keep the device responsive while spinning the encoder. Expect a small, unavoidable single‑click delay due to the Tuya MCU’s double‑click detection. These steps produce fast, reliable reaction in daily use without sacrificing Home Assistant integration. (elektroda.com)

If you share your device model (mains vs battery wall controller), current OBK version, and a short Console log while rotating/pressing, I can give you a tailored autoexec and dpID map.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.