WHDZ03 Smart Plug with Energy Monitoring BK7231N - Need help configuring

Question

I flashed WHDZ03 Smart Plug with Energy Monitoring BK7231N using cloudcutter.

Managed to configure PINs for energy monitoring and button toggle.

I cannot get to turn on the Blue LED for button toggle.

Do I need to assign a PIN for LED (WifiLed is working)?

The LED worked with Tuya App.

divadiow · Accepted Answer

I've just opened a WHDZ03 using a G-clamp to crack the glue apart without destroying anything. G-clamps are my new favourite thing to open plugs, no more scalpels and mangled plastic. Once open you can desolder the neutral and live pegs to free the PCB from the mains pins. You can then free the CB2S from the main board. I attach a factory fw dump and the uart boot log from my efforts this evening. Easyflasher detects these assignments Code: text Expand Select all Copy to clipboard - BL0937 SEL on P24 - Button (channel 1) on P11 - BL0937 VI on P6 - WiFi LED on P8 - BL0937 ELE on P7 - Relay (channel 1) on P26 But instead of WiFi LED on P8 I prefer LED_n on P8 (Channel 1) otherwise the LED just flashes blue regardless of relay state. At least with LED_n there's no LED when it's off and a solid blue LED when on. Sadly no red LED on this device. Code: JSONLog in, to see the code Here is undamaged device after dismantling and flashing. This has the same GPIOs

ferbulous · Answer

Try configure pin 8 as WifiLED_N

p.kaczmarek2 · Answer

@jkwim , do your device has two separate controllable LEDs or do you just want to remove WiFiLED role and just use LED for that?

WiFiLED_n (or without _n) is a WiFi status indicator
LED (or LED_n) is a diode that follows the channel value like a relay, so it shows whether relay is on or off (can be swapped)

Some devices might have just single diode available so you have to choose which role you want.

jkwim · Answer

I was playing with it.

Pin 8 = LED Channel 1

Works as expected: Blue when relay is OFF. Dark when Relay is ON.

If I recall properly there was a light blue in one state with Tuya FW.

I was also playing with Pin 10.

At one point I saw the light blue status but could not reproduce again.

Nevertheless, is it possible to change the pin role on the fly via a script?

Say:
1. On boot up Pin8=WiFiLED
2. Once WiFi is up Pin8=LED Channel 1
3. If WiFi is lost Pin8=WiFiLED

Also second question:
How to control brightness of LED via command or script?

p.kaczmarek2 · Answer

It is possible to change the pin role on the fly. You could also catch a WiFi event, although I am not sure if WiFi events are already added.

Still, your idea seems very useable, maybe I will just add a special pin role? Something like.... i don't know how to call it. WiFiAndPowerLED ?

Quote:

How to control brightness of LED via command or script?

It has to be on the PWM pin. We don't have software PWM yet.

jkwim · Answer

There is a MQTTState right? Smilarly if a WiFiState can be added Added after 3 [minutes]: WiFiAndLED Then the LED can be controlled for other purposes also by changing the channel right? If Channel is same as of Relay, then it will act as a Power LED. Otherwise it can be decoupled as any other output LED by changing in to a different channel.

Zain00 · Answer

I have the same plug model, here are som internal picture of the plug

jkwim · Answer

Great and Thank You! So that confirms my guess also that there might be a CB2S module inside. Based on all discoveries, looks like these are similar plugs in terms of WiFi module: 1. WHDZ03 (C2BS BK7231N + BL0937) 2. BSD48 (C2BS BK7231N + BL0937) LSPA7 which looks similar is different: LSPA7 (WB2S BK7231T + BL0937) @p.kaczmarek2 Would it be possible to create a sticky post with these kind of summary notes? I know database has everything but when shopping a new device these summaries will help to pick the correct device (In the past I have returned LSPA7 devices because Tuya app did not show Energy Monitoring option. I did not know about OpenBK at that time. Probably the BL0937 was in there but for some reason the app did not pick it up)

p.kaczmarek2 · Answer

Hello, what kind of sticky topic would you want?

ruffmonkey · Answer

Hi all

Any idea if these plugs will flash with the Tuya over-the-air converter software?

I can see from the post that you managed to take the plug apart (I have no idea how you managed that, as far as I can see it is incredibly well sealed).

Any info welcome, and just hoping these are not plugs where the chipset has been swapped and not documented...!

Kind Regards

p.kaczmarek2 · Answer

I think the following sentence means that he has flashed it over the air, by using tuya-cloudcutter:

hakimmuhiddin · Answer

Hi all,I'm having an issue. The power shows some reading, but the voltage and current remain 0.Do you have any idea what might be the possible reason? My model is WHD09, but very close to this forum picture.

beniamino38 · Answer

>>20345445

jkwim: Could you share the profile you used with cloudcutter for the WHDZ03? I bought some of these which appear to be on firmware 1.1.17, and I couldn't find a working profile for them.

Added after 8 [hours] 15 [minutes]:

I took one apart (destructively) and dumped the flash. Unfortunately:

[+] Matched pattern for BK7231N version SDK 2.3.3 LAN 3.4/CAD 1.0.5, payload type ssid
[!] The binary supplied appears to be patched and no longer vulnerable to the tuya-cloudcutter exploit.

These particular plugs are very solidly glued together -- I can't see a way to open them for flashing without destroying them. So I would recommend others avoid this device.

divadiow · Answer

this would be cool

p.kaczmarek2 · Answer

I think we have here an example of LED acting in the way you described through a script:

divadiow · Answer

slight correction, I was listing experience with it in AP mode, I hadn't actually joined it to wifi. With WiFi LED on P8 default it *does* flash blue before going solid blue after connection but then remains solid blue in any relay state. With that script, it behaves perfectly. Autoexec for this model Code: TextLog in, to see the code

jkwim · Answer

I bought a couple of these again recently and found out that they have patched Tuya firmware.

I tried using a C-Clamp to open but I applied to much force in one location and unfortunately the WiFi PCB got broken.

Haven't worked on the others yet.

p.kaczmarek2 · Answer

How the damage to PCB looks like? Maybe it's recoverable?

divadiow · Answer

>>20946334 Let's have a look!

p.kaczmarek2 · Answer

I've did a pad regeneration tutorial once, but it's not yet translated. I will update com link later, currently it yields 404 error:

jkwim · Answer

Sure! I would definitely want to. It is just that I was getting busier with a different device.

Advian1 · Answer

Just received one of these.What was your firmware version?Mine is 1.1.17I see it on the cloudcutter, but the device name suggests temp/humidity sensor. not sure if I should proceed?what is the way to disassemble it safely?

jkwim · Answer

This firmware is patched so cloudcutter cannot be used So opening is the only way out.

Advian1 · Answer

thanks. Any help on how I can open it without destroying the case? @divadiow can you please help? how I can open the device safely?

divadiow · Answer

G or F clamps. slow and steady at different angles. Like this

Advian1 · Answer

ok, thanks. I've only one clamp though. Will see how it goes.

divadiow · Answer

I only used one. You'll be fine. Just gotta get clamp the right points

Advian1 · Answer

any hints for the right points? :DAdded after 27 [minutes]:Looks like I managed to break it. Was it too much pressure?update: Was finally able to open it.I wouldn't say undamaged, but slight marks and bruises in a couple places.Much better than what I hoped.Thanks for your help. I wouldn't be able to open it such smoothly without the instruction!

divadiow · Answer

hey that's pretty good! I don't *quite* remember how I did it before. I think I made a small dent or two and vowed to buy an F-clamp with rubber feet so there's not such a hard surface against the plastic.

Buy more and practice more!

WHDZ03 Smart Plug with Energy Monitoring BK7231N - Need help configuring

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