ONENUO WiFi Tuya Water Leak Sensor Flood Leakage Detector with Sound Alarm (898DT)

Question

Hello,

I have bought this water leak, branded Tuya. Here are the pictures. Attached is the original firmware.
I would like to make it free from the cloud and use it at home with my Wi-Fi.
I'm not sure what to do next? I could not find a template for this device.

[Edit: added pictures of board after removing batteri case]

carlig833 · Accepted Answer

Buzzer of my water sensor is controlled by pin number 6 in WebApp > Config > Pin Settings. Here is the obk json config template:


{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "ONENUO WiFi Tuya Water Leak Sensor",
  "model": "Flood Leakage Detector with Sound Alarm (898DT)",
  "chip": "BK7231N",
  "board": "TODO",
  "flags": "0",
  "keywords": [
    "water sensor",
    "ONENUO WiFi",
    "898DT"
  ],
  "pins": {
    "6": "PWM;6",
    "14": "Btn;2",
    "15": "WifiLED;0",
    "20": "BAT_Relay;4",
    "22": "dInput;1",
    "23": "BAT_ADC;5"
  },
  "command": "",
  "image": "https://obrazki.elektroda.pl/1039201300_1716148730.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/topic4055031.html"
}

I could manage to drive the buzzer to emulate a modulated bi-frequency siren. Here is the autoexec.bat:


Battery_Setup 2000 3000 2 2400 4096
//measure batt every 2s
Battery_cycle 2
//mqtt_broadcastInterval 1
//mqtt_broadcastItemsPerSec 5
addEventHandler OnHold 10 SafeMode 5
setChannelLabel 1 Water
// now wait for MQTT
waitFor MQTTState 1
// extra delay, to be sure
delay_s 1
// publish water state at least once after boot
publish 1 $CH1
// if water detected, keep cycling (drains battery)
// also useful for configuring the device or doing OTA
mainLoop:
delay_s 1
if $CH1!=1 then "goto sirenOn" else "goto sleep"
// turn on the siren and goes into siren loop
sirenOn:
setChannel 6 10
// siren loop repeats while water is detected
sirenLoop:
backlog PWMfrequency 460;delay_ms 50
backlog PWMfrequency 491;delay_ms 50
backlog PWMfrequency 521;delay_ms 50
backlog PWMfrequency 550;delay_ms 50
backlog PWMfrequency 577;delay_ms 50
backlog PWMfrequency 601;delay_ms 50
backlog PWMfrequency 621;delay_ms 50
backlog PWMfrequency 638;delay_ms 50
backlog PWMfrequency 650;delay_ms 50
backlog PWMfrequency 657;delay_ms 50
backlog PWMfrequency 660;delay_ms 50
backlog PWMfrequency 657;delay_ms 50
backlog PWMfrequency 650;delay_ms 50
backlog PWMfrequency 638;delay_ms 50
backlog PWMfrequency 621;delay_ms 50
backlog PWMfrequency 601;delay_ms 50
backlog PWMfrequency 577;delay_ms 50
backlog PWMfrequency 550;delay_ms 50
backlog PWMfrequency 521;delay_ms 50
backlog PWMfrequency 491;delay_ms 50
if $CH1!=1 then "goto sirenLoop" else "goto sirenOff"
// turn off the siren and go into main loop
sirenOff:
setChannel 6 0
goto mainLoop
sleep:
delay_s 5
// All good, sleep for 1 day or next water event
PinDeepSleep 86400

I have removed all the "general flags" and I am currently running any of them.

Lesson learned:
1) Pin numbers in Tuya CBU datasheet does not match pin numbers in WebApp
2) WebApp > Gpio Finder was very useful to guess where the buzzer was
3) A little bit tricky to implement the buzzer tone. Here is a link to helper worksheet to build the code:
https://docs.google.com/spreadsheets/d/1TK9gSiA_PeJN_Ib2-lEu-KJxAQaQPhOLzvdFuCchP-U/copy

p.kaczmarek2 · Answer

Well, it seems that our tool is not able to extract the config at this time. So now you need to either investigate the PCB or play around with GPIO doctor (in the web app). Find out the role of each pin. We are looking for at least a LED Pin, water sensor pin (input), button pin, maybe more...

carlig833 · Answer

Hello,

I could easily find a basic configuration of this device that works for the purpose, thanks to the following post about a similar device:
https://www.elektroda.com/rtvforum/topic4054445.html

Here is the device template in json format:


{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "ONENUO WiFi Tuya Water Leak Sensor",
  "model": " Flood Leakage Detector with Sound Alarm (898DT)",
  "chip": "BK7231N",
  "board": "TODO",
  "flags": "0",
  "keywords": [
    "water sensor",
    "ONENUO WiFi",
    "898DT"
  ],
  "pins": {
    "14": "Btn;2",
    "15": "WifiLED;0",
    "20": "BAT_Relay;4",
    "22": "dInput;1",
    "23": "BAT_ADC;5"
  },
  "command": "",
  "image": "https://obrazki.elektroda.pl/1039201300_1716148730.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/topic4055031.html"
}

Here is the autoexec.bat


Battery_Setup 2000 3000 2 2400 4096
//measure batt every 2s
Battery_cycle 2
//mqtt_broadcastInterval 1
//mqtt_broadcastItemsPerSec 5
addEventHandler OnHold 10 SafeMode 5

setChannelLabel 1 Water

// now wait for MQTT
waitFor MQTTState 1
// extra delay, to be sure
delay_s 1
// publish water state at least once after boot
publish 1 $CH1

// if water detected, keep cycling (drains battery)
// also useful for configuring the device or doing OTA
again:
delay_s 1
if $CH1!=1 then goto again
delay_s 5 // was 5

// All good, sleep for 1 day
PinDeepSleep 86400

General flags:


Flag 37 - [WiFi] Quick connect to WiFi on reboot (TODO: check if it works for you and report on github)

Water detection works, deep sleep and periodic wake-up works, battery reports work.

This device also features 80db alarm, but couldn't find how to make it work. Suggestions?

p.kaczmarek2 · Answer

Very good progress. Thanks for sharing!

I think you can get buzzer working with PWM and PWMFrequency command. We've been actually talking about it in other topic few days ago:
https://www.elektroda.com/rtvforum/find.php?q=PWMFrequency
Here is one related link: https://www.elektroda.com/rtvforum/topic4052199-30.html#21077854

Please try it out and let me know how it goes.

carlig833 · Answer

Ok, I had a look at the related link to learn how to test the buzzer. Unfortunately I don't know which PIN drives the buzzer. There is no meaningful information in json config extracted from original firmware backup. Thinking about the options, a brute force approach would be to test each and every pin, right? Given that this is a CBS module, and having read datasheet I deduce there are possibly 5 PINs for PWM: 8 P8 I/O Support hardware PWM (Correspond to Pin 24 of the IC) 9 P7 I/O Support hardware PWM (Correspond to Pin 23 of the IC) 10 P6 I/O Support hardware PWM (Correspond to Pin 22 of the IC) 11 P26 I/O Support hardware PWM (Correspond to Pin 15 of the IC) 12 P24 I/O Support hardware PWM (Correspond to Pin 16 of the IC) (source: Then I have: 1) Enabled the show raw pwm controllers flag and rebooted the device 2) Set PWM for PINs 8 to 12 in the PIN configuration page and common channel 6 in WebApps > Config > PinSettings 3) exec command PWMFrequency 1000 in the WebApp > Logs > Command 4) exec command setChannel 6 50 in the WebApp > Logs > Command I could not ear any sound from the device. Am I doing the correct steps?

p.kaczmarek2 · Answer

If done correctly, the following should be ok. You can check it with a, for example, LED and resistor connected to PWM pin. Changing the channel value should adjust the brightness of the LED.

Maybe we need to investigate the PCB itself? How is the buzzer connected?

divadiow · Answer

I am playing with pwm for LED/buzzer for a door contact sensor at the moment. Maybe that needs its own thread though.

p.kaczmarek2 · Answer

Sure, please open thread for buzzer (or your device) Added after 44 [minutes]: >>21092652there are 6 PWMs I think, not 5. Did you check them all

divadiow · Answer

Ooh thanks. I might add some of that to my device Added after 21 [minutes]:added

p.kaczmarek2 · Answer

Good job, I've also added your autoexec.bat to our samples:
https://github.com/openshwprojects/OpenBK7231...mmit/5009cff8aa1e3c456f2a2595495366cd5f175fc7
I didn't refresh docs yet, tough.

Btw, @divadiow , if you have some time, you may consider adding some comments to existing autoexec samples. Just make sure to modify the source .bat file, and not the generated automatically MD document...

divadiow · Answer

sure. as in, as I see some good ones around, like if I find a device not in devicelist?

p.kaczmarek2 · Answer

There are two things that can be done to help: - adding comments to existing autoexec samples - adding new autoexec samples

divadiow · Answer

oh, COMMENTS. Yes, yes.

mariuszkowa · Answer

I have exactly the same device. I've used the provided pin configuration and uploaded the autoexec.bat. Thank you guys for providing those!
It works great (detects water and produces audio signal) except for the fact that the device shows 4800mV which seems invalid for 2xAAA battery.
@carlig833 do you see proper voltage?

I don't think the LED Dimmer actually works (I don't see any difference on the LED) and not sure what is the "Toggle Light" control doing, but I don't really need those.
Battery level on the other hand is a useful information to know when the batteries should be changed, so this one I'd like to fix, not sure how though.

EDIT: The best configuration I've found that is showing "somewhat reasonable" voltage and percentage is to set pins this way (note pin BAT_ADC on the pin 24):


"pins": {
    "6": "PWM;6",
    "15": "WifiLED;0",
    "20": "BAT_Relay;0",
    "22": "dInput;1",
    "24": "BAT_ADC;0"
  },

And Battery Setup in the autoexec.bat like this:

Battery_Setup 2200 2800 1.25 2400 4096

Let me know if anyone got a better setup. This above shows low percentage when battery is getting low but I think there may be a better approach, just couldn't find it.

ONENUO WiFi Tuya Water Leak Sensor Flood Leakage Detector with Sound Alarm (898DT)

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