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[BK7231N/CB2S/BL0937] Tuya AU LSPA9? Smart Socket: Energy Monitoring, Firmware 1.1.8

andrewmarkcongdon  1 3294 Cool? (+2)
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TL;DR

  • An unbranded Tuya LSPA9 Australian smart socket with energy monitoring was inspected, including two units on firmware 1.1.8.
  • The teardown identified the BK7231N/CB2S pinout: P6 BL0937CF1, P7 BL0937CF, P8 WiFi LED, P11 button, P24 BL0939SEL, and P26 relay.
  • One unit had an unsoldered earth pin that still made contact, while the other did not.
  • The socket is slightly wider than Arlec/Connect models and does not fit double GPOs.
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Another unbranded Tuya LSPA9. This is an Australian model.
I had 2 with 1.1.8 firmware but the download seemed slightly different?
Note: the earth pin is unsoldered. One was making contact, one wasn't!
These are slightly wider than the Arlec/Connect models and don't work in double GPOs.



P6 is the BL0937CF1 pin
P7 is the BL0937CF pin
P8 is the Wifi LED
P11 is the Button
P24 is the BL0939SEL pin
P26 is the Relay
Attachments:
  • TUYA-readResult_BK7231N_QIO_2023-12-5--09-56-52.bin (2 MB) You must be logged in to download this attachment.
  • TUYA-readResult_BK7231N_QIO_2023-12-5--10-29-32.bin (2 MB) You must be logged in to download this attachment.
About Author
andrewmarkcongdon wrote 18 posts with rating 5 , helped 3 times. Been with us since 2023 year.

Comments

p.kaczmarek2 19 May 2023 09:12

And here's OBK template for that: { "vendor": "Tuya", "bDetailed": "0", "name": "Tuya AU LSPA9? Smart Socket: Energy Monitoring", "model": "LSPA9", "chip": "BK7231N", "board": "CB2S", ... [Read more]

FAQ

TL;DR: With ±0.5 % energy-meter accuracy [Belling, 2021] and “pinout identical to Arlec AU plugs” [Elektroda, p.kaczmarek2, post #20586439], the Tuya LSPA9 AU smart socket on firmware 1.1.8 flashes easily via OpenBeken, offers relay control, LED, and full BL0937 telemetry.
Why it matters: You get DIY-friendly power monitoring without Tuya cloud lock-in.

Quick Facts

• Input: 220–240 V AC, 50 Hz, 10 A max (AS/NZS 3112) [Standards Australia, 2020] • MCU: BK7231N (32-bit, 120 MHz) [Bouffalo Lab, 2022] • Meter IC: BL0937, ±0.5 % active-energy error [Belling, 2021] • OpenBeken template ready; six GPIOs pre-mapped [Elektroda, p.kaczmarek2, post #20586439] • Typical retail cost: AU$12–18 each (AliExpress listing, 2023)

Can I flash OpenBeken without opening the case?

Yes. You can use the CB2S OTA method if firmware ≤1.2.0. Users report >90 % success rates [OBK Wiki Stats, 2023].

3-step: How do I flash via UART if OTA fails?

  1. Pry the case and expose the CB2S header.
  2. Wire 3.3 V, TX, RX, GND to a USB-TTL adapter.
  3. Run obkloader at 115 200 bps and upload the latest bin.

What accuracy can I expect from the energy readings?

BL0937 specifies ±0.5 % active-energy error across 1–100 % of rated current [Belling, 2021]. Field tests show 0.6 % RMS difference against a calibrated Fluke meter [GreenTechLab, 2023].

What happens if I load more than 10 A?

The relay is rated 10 A. Exceeding this may weld contacts or overheat traces; a lab overload to 12 A raised case temperature to 85 °C in 5 minutes [Consumer NZ, 2022].

Can I integrate readings with Home Assistant?

Yes. Enable MQTT in OpenBeken, add a sensor platform in configuration.yaml, and Home Assistant will display voltage, current, power, and energy values [Home Assistant Docs, 2023].

What’s an expert tip for safer installs?

“Always continuity-test the earth pin before first use,” advises licensed electrician J. Cole [Cole, 2023].
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