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Configuring BC548 NPN Transistor for Tuya Wifi Water Leakage Detector CB3S

belveder79 1509 4
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  • Just acquired another WiFi Water Leakage Detector from Aliexpress

    https://de.aliexpress.com/item/1005005754072819.html

    WiFi water leakage detector with a white sensor and cord on a map background.

    which is a little different to this one here, but it essentially works the same way.

    WiFi water leakage detector with open casing and packaging. Close-up of the water leakage detector PCB with labeled connections 3.3V, TX, RX, and Gnd.

    It is powered with 2 AAA batteries, and as in the previous post, it simply goes to sleep, but does not wake up.

    In order to make this work, I followed the same procedure as in the upper post and used a BC548 NPN transistor between 3.3V (+10k resistor), one pin from the sensor to base and the other one to the connector on the board.

    Works as expected - goes to sleep, wakes up if you touch the sensor.

    Close-up of a water leakage detector circuit board showing electronic components and wires.

    The extraction from the flashing tool is incomplete and misses the relay, as the board has also a buzzer on the bottom. In order to use that one, you have to add it as a relay and configure it properly like this:

    Code: text Expand Select all Copy to clipboard
    
{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "Tuya WiFi Smart Water Leakage Detector (CB3S, no TuyaMCU)",
  "model": "unknown",
  "chip": "BK7231N",
  "board": "CB3S",
  "flags": "0",
  "keywords": [
    "water leakage",
    "CB3S",
    "Aliexpress"
  ],
  "pins": {
    "7": "Rel;0",
    "8": "DoorSnsrWSleep_nPup;0",
    "14": "BAT_Relay;1",
    "23": "BAT_ADC;1",
    "24": "Btn;0",
    "26": "WiFiLED_n;0"
  },
  "command": "",
  "image": "https://obrazki.elektroda.pl/1396778400_1707649738.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/viewtopic.php?p=20955712"
}


    I don't know about battery consumption. I do NOT have any custom script, so I will see how long it "survives" without tweaking it.

    Cool? Ranking DIY
    About Author
    belveder79
    Level 4  
    Offline 
    belveder79 wrote 10 posts with rating 2, helped 1 times. Been with us since 2023 year.
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  • #2 20957109
    p.kaczmarek2
    Moderator Smart Home  
    While I indeed think you did a good job on modification, I am not sure if it really was required. I think a correct pin setting (pull up, pull down or none) with a proper DSEdge setting (DSEdge 0, or DSEdge 1, or DSEdge 2) would work well enough in OpenBeken. I already had seen a door sensor which also at first seemed unable to wake up from a one certain state, but it turned out that I had to change just the DSEdge setting. You can search other topics for more details:
    https://www.elektroda.com/rtvforum/find.php?q=DSEdge
    Helpful post? Buy me a coffee.
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  • #3 20957358
    belveder79
    Level 4  

    Thanks...

    You are totally right. I'm sure that it has to work with proper settings in OpenBeken concerning some DSEdge parameters and such because the unmodified setup also works with the Tuya firmware... Openbeken certainly has the required features... As in the other post, it did not work with the standard settings of nPup etc from the module config. So it can't go without some custom setting...

    My major problem is the connectivity of the chipsets overall concerning WIFI with OpenBeken. Because they (any of them CBU, CB3S etc.) don't connect at all most of the time to my network, playing around with settings is a really time-consuming task. I did not find a workaround yet, so overall the sensors from Tuya are right now more something that I look into out of interest, rather as a real solution...
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  • #4 20957427
    p.kaczmarek2
    Moderator Smart Home  
    Is your WiFi crowded, have you tried changing the WiFI channel setting or moving sensors closer to router?
    Helpful post? Buy me a coffee.
  • #5 20957434
    belveder79
    Level 4  

    I wrote about my experiences with door sensors here.

    I indeed have around 50 devices in my network, but I can essentially (and I did) add another 20-40 devices from mobiles to laptops and others. None had any problem, but the OpenBeken simply won't connect most of the time at all, or it takes almost forever.

    Added after 25 [minutes]:

    I usually run my network in 802.11b/g/n mode. What I can say is that when I run the network in 802.11b/g mode only, it works considerably better - not great, but at least I get a connection in 80% of all cases within the 60 seconds that the device is supposed to be alive when on battery....
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