Exploring BRK7231N Chip in Costco/FEIT Smart Plug BPPLUG/WIFI/WP/2: Pinouts & OpenBK Firmware

So it appears there are at least 3 versions of this Feit / Costco smart plug floating around. One with an ESP, one with a BRK7231T and the one I have...

I would like to report a 3rd version, which I purchased last month. This version has the BRK7231N chip in it.

I did not take a picture of the internals, but putting OpenBK firmware was pretty straightforward. There are solder pads for U1TX, U1RX, GND, 3V3 and CEN all in a line on the back of the PCB. They worked as expected.

The main reason I am making this post is for the pinouts. After some experimentation here is what I have found.

Relay - 15
Button - 26
Led_n - 24

All on Channel 1.

Unfortunately I did not take a picture while it was apart, but the PCB looks very similar to other BPPLUG/WIFI/WP/2 PCBs found on the web.

Thank you for reporting, it certainly makes sense. From what I heard, the oldest devices are using ESP, slightly newer are using BK7231T and even more newer are using BK7231N, but I may be wrong.

It might be worth to link my original review of BK7231T version:
Link

I will add your report to our device templates database.

Question: so your device has single relay but two output sockets?

To answer your question, yes one relay, two sockets. Both sockets are on or off. It occurred to me that perhaps the buttons or LEDs are different on mine, so I took a picture of the front side for future reference.

Ah thx, so this is indeed a slightly different device.
Another dual one was shown here: https://www.elektroda.com/rtvforum/topic3937358.html

For the BK7231T version, see this topic.

I purchased a similar device from Costco today. It seems almost exactly identical to the photos above, except mine is labeled "PLUG/WIFI/WP/2", not "BBPLUG/WIFI/WP/2". The FCC ID is the same, SYW-PLUGWFWP, and it also contains a BK7231N.

Flashing was straightforward (uartprogram with "--unprotect" and "--startaddr 0x0" options) and the pin configuration from above worked for me. There are two LEDs; the red one is on P24, and the blue one is on P17, which I configured as WifiLED_n. So the full configuration is:

P15: Rel
P17: WifiLED_n
P24: Led_n
P26: Btn