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

andrewmarkcongdon 3294 1

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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Post #1
20586316 19 May 2023 05:08

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

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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.

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#2 20586439 19 May 2023 09:12

p.kaczmarek2 p.kaczmarek2

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Post #2
20586439 19 May 2023 09:12

And here's OBK template for that:
Code: JSON
Log in, to see the code

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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

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)

What hardware does the LSPA9 smart socket use?

It contains a BK7231N Wi-Fi MCU module (model CB2S) and a BL0937 energy-measurement IC on the power board [Elektroda, andrewmarkcongdon, post #20586316]

Which pins connect to the BL0937 energy IC?

GPIO6 links to BL0937 CF1, GPIO7 to CF, and GPIO24 to SEL as defined in the OpenBeken template [Elektroda, p.kaczmarek2, post #20586439]

Is the earth pin always soldered?

No. One unit arrived with the earth pin floating because it was never soldered, creating a safety fault [Elektroda, andrewmarkcongdon, post #20586316]

How wide is the plug, and will it block a double GPO?

The casing is slightly wider than Arlec/Connect plugs, so it blocks the second outlet on a standard Australian double GPO [Elektroda, andrewmarkcongdon, post #20586316]

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?

Pry the case and expose the CB2S header.
Wire 3.3 V, TX, RX, GND to a USB-TTL adapter.
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].

Does the Wi-Fi LED stay on during normal use?

By default GPIO8 drives WifiLED_n; OpenBeken blinks on AP mode and turns solid when connected [Elektroda, p.kaczmarek2, post #20586439]

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].

Does firmware 1.1.8 limit any features?

No features removed. However, OTA downgrade is blocked, so flash once; recovering needs serial lines [Elektroda, andrewmarkcongdon, post #20586316]

What’s an expert tip for safer installs?

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