CB3S (BK7231N) Water Leak Detector without TuyaMCU: Battery Saving Tips & Configuration

Question

Hi, first of all, thanks for making this great firmware. I have a Water Leak sensor that is not equipped with a tuyaMCU, The module is CB3S(BK7231N) I have flashed this CB3S with OpenBK7231N_QIO_1.15.407, the device has connected to HA, but the problem is I don't know how to reduce battery...

TomTheGeek · Accepted Answer

I picked up one of these as it was cheap and seemed like a good platform to use for battery-powered projects. The problem is I fried something on the board when trying to get battery monitoring working. I got it to work, but when I put the command in the startup file, it would rapidly heat up as if there was a short somewhere. Here is my template and autoexe file. This boots and doesn't burn anything up, but no battery monitoring works.

@GUTEK@ · Accepted Answer

Hello,
I also became the owner of this water sensor. Unfortunately, after downloading Open Beken, I couldn`t force it to wake up when the state changed. And even with the original software, it didn`t quite work properly in my opinion.

Therefore, I soldered an NPN transistor (the first one found on the motherboard) and a 10kΩ pull-up resistor connected to 3.3V to the P8 input, where one of the electrodes goes.
Something similar to the example in this diagram: https://www.instructables.com/Simple-Water-Sensor/

It looks like:

Thanks to this, the system simply gets 1 or 0 (3.3V or 0V). Now all I had to do was set the sensor as DoorSnsrWSleep_nPup and after short tests I found that it works properly. I will add that selecting DoorSnsrWSleep, which should pull up itself, also did not want to wake up the system. Additionally, you also need to turn on flag 42 to reverse the readings.

{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "Full Device Name Here",
  "model": "enter short model name here",
  "chip": "BK7231N",
  "board": "TODO",
  "flags": "1156",
  "keywords": [
    "TODO",
    "TODO",
    "TODO"
  ],
  "pins": {
    "7": "WifiLED_n;0",
    "8": "DoorSnsrWSleep_nPup;0",
    "14": "BAT_Relay;1",
    "23": "BAT_ADC;1",
    "24": "Btn;2"
  },
  "command": "",
  "image": "https://obrazki.elektroda.pl/YOUR_IMAGE.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/topic_YOUR_TOPIC.html"
}

divadiow · Accepted Answer

Here's another variant I didn't think warranted its own thread. This one has a button and some test pads at the bottom of the PCB. FW ver 1.0.6 cloudcutterable.

No soldering was performed as crocodile clips can easily be attached to all needed contacts for flashing.

Log in, to see the code

autoexec.bat with pindeepsleep. button wakes sensor as does moisture probe status change in either direction (dry/asleep -> wet and wet/asleep -> dry)

Log in, to see the code

OBK template

Log in, to see the code

https://github.com/OpenBekenIOT/webapp/pull/1...mits/efbc89f895def3b9794163e6b5fb84c8dfcef80c

p.kaczmarek2 · Answer

Well, DeepSleep is in early stage of development, but you basically have two options here. First option would be to use the GPIO wakeup from the sensor (it will wake up module when, for example, it detects water) and then module can report it's status, and the second option would be to just deep sleep for example, for 15 minutes, then wake up, check for water/report, and sleep again for fixed time of 15 minutes.
The external GPIO deep sleep is not yet fully working on N, only on T, so I'll try to look into that for you, or you can for now settle with second solution.
In general it depends on your use case. how quick reporting do you need.

I also checked the last release and I see that you'll have to update your firmware before using anything related to deepsleep. But in general, DeepSleep [Time] command should turn off device for given time and then device will reboot from scratch.

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

Helpful post? Buy me a coffee.

kyantobam · Answer

I have updated to ver 1.15.410

i don't where to put DeepSleep Command, putting on scripts but no effect

this autoexec :
setChannelType 0 ReadOnly
setChannelType 1 toggle
SetChannel 1 0
setChannelType 3 humidity
setChannelType 5 ReadOnly
startScript BACA * 507

this --> BACA id 507 :
+++++++++++++++++++++++++++
again:
          if $CH0==1 then goto done
          if $CH1==1 then goto done
          if $CH5==0 then goto done
          setChannel 20 0
          goto again
done:     // make sure  BATT monitor OFF
          setChannel 1 0
              // make sure only one shot
          if $CH20==1 then goto again
          setChannel 1 1
          delay_s 3
	  SetChannel 3 $CH11
	  setChannel 1 0
          // make sure only one shot
          setChannel 20 1 
	  delay_s 10
          DeepSleep 600 -------------------------------> no effect  :(  :(
	  goto again
+++++++++++++++++++++++++++

p.kaczmarek2 · Answer

Please try if DeepSleep works at all, just from the console, execute DeepSleep 600 and see if device goes offline (and comes back)

kyantobam · Answer

I made a mistake on the scripts, thanks. Now just observe how long the battery life[/film]

Ipn00tic · Answer

It goes into deep sleep mode but does not wake up when the pins come into contact with water, it only wakes up if you make a direct contact with a wire between the two contact pins. but when not in deep sleep it works fine and detects water between the pins and also resets the 60 second count for deepsleep.

I checked that when using DoorSnsrWSleep_nPup it loads the DoorSensor drivers, is this the problem? Is it necessary to load the specific drivers for the water leak?

Added after 1 [minutes]:

Added after 41 [seconds]:

kyantobam wrote:
I made a mistake on the scripts, thanks. now just observe how long the battery life[/film]

friend, can you share the complete and correct script you are using?

kyantobam · Answer

Have same problem, during deepsleep 100% can wake up use button (P24) only, with Water leak probe sometimes can sometimes can't.
When already wake up, 100% Water leak can detect DRY or WET.

My Script only for Batt monitor
Channel 2 is (P14) turn on transistor, Channel 4 only LED

setChannelType 2 toggle
setChannelType 4 toggle
setChannelType 3 humidity
SetChannel 2 0
startScript TEKTOK * 440

restart:
setChannel 12 0
setChannel 2 0
again:
if $CH2>=1 then goto tmbah
setChannel 2 1
tmbah:
delay_s 1
setChannel 4 0
addChannel 12 1
if $CH12<=3 then goto again
if $CH12>=5 then goto mati
setChannel 3 $CH11
setChannel 4 1
mati:
setChannel 2 0
setChannel 4 0
if $CH12<=20 then goto tmbah
goto restart

p.kaczmarek2 · Answer

The DoorSensor driver is working for both Pull Up (DoorSnsrWSleep) and no-pull-up inputs (DoorSnsrWSleep_nPup). If it's not working, then a sufficient voltage level was on reached on input pin. What is the connection of water sensor pin in your device? Does it have any external pull up or pull down resistors? Or maybe is there some kind of circuit before BK GPIO used for water sensor? The only thing I can suggest right now is that I can provide a DoorSnsrWSleep_pullDown pin, which has a programmable, internal, pull-down resistor (because there are 3 options in bk - gpio with pullup, with pulldown, or with no pulls).

eddie.t.h · Answer

It seems that the Pindeepsleep function engages an internal pull-down resistor. Therefore, the sensor does not wake up from the liquid, only from a metallic short circuit. The question is whether it is a hardware or software bug?

p.kaczmarek2 · Answer

This is configurable. You have multiple pin roles:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/ioRoles.md
Namely:

There is also DSEdge setting:


| DSEdge | [edgeCode] | DeepSleep (PinDeepSleep) wake configuration command. 0 means always wake up on rising edge, 1 means on falling, 2 means if state is high, use falling edge, if low, use rising. Default is 2.<br/><br/>See also [DSEdge on forum](https://www.elektroda.com/rtvforum/find.php?q=DSEdge). |

eddie.t.h · Answer

I know about these settings but they don't seem to work. That is, they work until the Pindeepsleep command is executed. Therefore, when the sensor is awake, everything works properly, i.e. it detects moisture correctly. After sleep, the measurements showed that an additional resistance of several dozen kohm is attached to the pin, so the water resistance is too high to get a high state. I have the latest version of the software.

EDIT:
I checked again carefully and everything indicates that the PinDeepSleep function is bugged.
Setting pin P8 as DoorSnsrWSleep_nPup makes it correctly detect the dampness on the probe in active mode. The input resistance of the pin of the order of Mohms.
Enabling DoorSnsrWSleep_pd makes the input resistance drop to 18kohm and the probe no longer works. So here everything is ok, the functions work properly.
That is, with the DoorSnsrWSleep_nPup option, the sensor theoretically should work properly but unfortunately it does not. Until sleep everything is ok, the input resistance is in Mohm, but after sleep it drops to 18kohm - so clearly the pulldown resistor is activated!
The same thing happens when I set the inputs as ordinary DI without pull-up and issue the PinDeepSleep command.

Mad_Maxs · Answer

Hello, Did it start to work properly after this modification? I've got the same device, and the same problem with waking up. Additionally, I've set WifiLED to wifiled_n to see when it's connected, but after it goes to sleep, the LED is still on.

belveder79 · Answer

I can't confirm that it works for this particular version of the sensor, however I have another one which is very similar documented here and for this one I can confirm that it indeed works.

Did not play around with the DeepSleep or anything yet, but it works like a door sensor now and comes back from deep sleep if you touch the sensor.

Mad_Maxs · Answer

By inserting the NPN BC547 transistor, with the emitter in place of the probe pad, the collector in the white wire from the probe, and the base through a 10kohm resistor in VCC, we obtain correct operation with pin 8 set as DoorSnsrWSleep_nPup, Flag 42 to OFF and DSEdge 2.

I noticed that when the probe is immersed in water, the sensor wakes up, does its job, goes to sleep, immediately wakes up again, does its job, goes to sleep and won`t wake up again... Even if I take the probe out of the water and dry it, it gets wet again no longer agitates the module. Only btn wakes him from sleep, detects that he is dry and goes to sleep, again watching and waiting for the leak to be detected. So it has to be??

BTW, how is work going on connecting PinDeepSlepp with DeepSleep so that you can periodically wake up the module to report the battery status?

p.kaczmarek2 · Answer

It is now working and released on N platform, please refer to the following guide: BK7231 deep sleep - how to enable wake up both on timer and on GPIO interrupt in OpenBeken? We still need to port that to T. If you know C and want to help, give it a go.

CB3S (BK7231N) Water Leak Detector without TuyaMCU: Battery Saving Tips & Configuration

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