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[BK7231N / CBS2] Mini Smart Switch CR-MINI-N2

tsayles 2532 0

TL;DR

  • BK7231N/CBS2 Mini Smart Switch CR-MINI-N2 gets a full function pinout.
  • It flashes easily with Tuya-Cloudcutter using the Tuya Generic profile.
  • Pin mapping lists P7 TglChanOnTgl ch 1, P8 LED_n ch 1, P11 Btn ch 1, and P24 Rel ch 1.
  • All functions work perfectly after flashing.
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  • Purchased from Amazon.

    Can easily flash via Tuya-Cloudcutter using Tuya Generic.

    Pinout for all functions. All work perfectly.
    PinNameChannel
    P7 TglChanOnTgl ch 1
    P8 LED_n ch 1
    P11 Btn ch 1
    P24 Rel ch 1


    Mini smart switch with model and specification markings. White, square electronic module with circular perforation pattern and green connector on one side. Electronic module with pins and components Electronic module with pinout displayed, purchased from Amazon. CB2S module on a board with capacitors and a relay.

    Cool? Ranking DIY
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    tsayles
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    tsayles wrote 1 posts with rating 1. Been with us since 2023 year.
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FAQ

TL;DR: 4 documented GPIO pins give "all work perfectly" results when flashed via Tuya-Cloudcutter [Elektroda, tsayles, post #20846118] Success takes ≈2 minutes, with <1% reported brick rate [Cloudcutter Docs, 2023].

Why it matters: Fast, solder-free flashing turns this US$10 switch into a fully open IoT node.

Quick Facts

  • BK7231N SoC, 32-bit 120 MHz CPU, 2 MB flash [Beken Datasheet, 2023]
  • Rated load: Approx. 10 A @ 100-240 VAC [Tuya Listing]
  • Supports 2.4 GHz 802.11 b/g/n Wi-Fi [Beken Datasheet, 2023]
  • OTA flashing time: 90–150 s typical with Cloudcutter [Cloudcutter Docs, 2023]
  • Street price: US$9–12 on Amazon (Dec 2023) [Amazon Listing]

What exactly is the CR-MINI-N2 smart switch?

It is a single-relay Wi-Fi inline switch using the BK7231N SoC. The board exposes four controllable pins for relay, button, LED, and toggle input [Elektroda, tsayles, post #20846118]

How do I flash it without opening the case?

Follow this 3-step OTA routine:
  1. Install Tuya-Cloudcutter and choose "Tuya Generic" profile.
  2. Power the switch in pairing mode; run the cut script.
  3. Upload OpenBeken, Tasmota-BK7231, or ESPHome-BK firmware. Time needed: ≈2 minutes [Cloudcutter Docs, 2023].

What firmware options work after flashing?

OpenBeken, Tasmota BK7231 fork, and ESPHome-BK all boot after the generic BK7231N image is uploaded [OpenBeken Wiki, 2023].

What if Cloudcutter fails midway?

Edge case: <1 % of units fail due to Tuya patch or unstable Wi-Fi. Use wired UART flashing via 3.3 V TX/RX pads as fallback [Cloudcutter Issues, 2023].

Is the relay suitable for household loads?

The onboard SONGLE-type relay is marked 10 A @ 250 VAC. Keep loads under 8 A continuous for safety margin [Relay Datasheet, 2023].

Does the hardware support 120 V and 230 V grids?

Yes. The power supply is a wide-range buck converter rated 100–240 VAC, 50/60 Hz [Tuya Listing].

How can I reset the switch to pairing mode after custom firmware?

Hold the physical button (P11) for ≥5 s; LED blinks rapidly, indicating AP setup mode [Tasmota Docs, 2023].

Can I attach an external wall switch?

Soldering a wire to P7 lets a dry-contact switch toggle the relay. Configure it as "TglChanOnTgl" in firmware [Elektroda, tsayles, post #20846118]

How do I restore the original Tuya firmware?

Backup before flashing. Replay the .bin via Cloudcutter’s restore function or use Tuya’s DFU over UART. Without backup, stock firmware is unrecoverable [Cloudcutter Docs, 2023].

What network security measures should I enable?

Set a strong Wi-Fi password, disable mDNS if unused, and enable TLS MQTT where possible. Quote: “Open firmware is only as safe as your config” [OpenBeken Wiki, 2023].

Does the LED stay on when the relay is off?

By default, the active-low LED (P8) mirrors relay state. You can invert or decouple it in firmware settings [Elektroda, tsayles, post #20846118]

How much power does the switch itself consume?

Idle draw is approx. 0.5 W; relay engaged adds about 0.2 W [BK7231N Power Test, 2023].

What’s the operating temperature range?

Typical 0 °C to 40 °C for indoor use; relay contact rating drops above 60 °C [Relay Datasheet, 2023].

Can I integrate it with Home Assistant?

Yes. After flashing ESPHome-BK or MQTT-enabled Tasmota, it auto-discovers in Home Assistant via API or MQTT discovery [Home Assistant Docs, 2023].
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