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WiFi SmartLife single-color LED strip dimmer - test, interior, diagram

p.kaczmarek2 3753 6
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  • WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Hello my dear.
    Here I will test a WiFi driver / dimmer for a single-color LED strip compatible with the SmartLife application. Then I will show its interior and sketch its diagram. I will also check how high the currents it can withstand and repair a minor defect that will arise as a result of my tests.

    Related Topics
    I have already written a few topics about ESP-based WiFi products. I mainly show interiors there.
    I also describe the process of programming such a switch there and using it with the manufacturer's application (Blitzwolf, SmartLife, Tuya, eWeLink) or Tasmota.
    I recommend that you familiarize yourself with these topics, I will not repeat all the information several times and as a rule, they apply to all products of this type.
    List below:
    - BW-LT30, i.e. a WiFi adapter for a light bulb - test, teardown and uploading ESP firmware
    - WiFi-controlled electrical socket - BW-SHP8 - start-up and tests
    - Test and interior of the BW-SS3, i.e. the WiFi light switch from Blitzwolf
    - PS-16-M WiFi socket / plug and eWeLink / Coolkit application - test and teardown
    - SmartLife switch - test, interior and WiFi light switch programming (similar switch, but without RF and description of programming it in Arduino via cables)
    - SC3-01 SmartLife switch and uploading ESP firmware via WIFI (tuya-convert / OTA) (this time programming via WiFi, no need to open the housing, no soldering of cables)
    - WiFi QTouch switch can only be plugged into the L cable - test, interior, diagram
    Additionally, a second topic about Tasmota:
    - ESP8266 and Tasmota - step-by-step control of the WiFi relay
    Additionally, I recommend the topic about Home Assistant (which can control a collection of such devices):
    Home Assistant Tutorial - configuration, WiFi, MQTT, Zigbee, Tasmota

    In some of the topics above, I also discuss the possibility of creating automation for devices of this type (eg rules such as "automatically turn on the lighting when it is after 10 p.m.", or "turn on the lighting when the motion sensor detects the presence of a person in the room", etc.).

    Purchase and first impression
    I found the dimmer on the network under the password Tuya Smart Life Dimmer DC12 DC24V DC5V USB Wifi 5050 RGB / RGBW / RGBCCT Led Light Strip Single Color Controller for Alexa Google - Monotone Light for about $ 10 (including shipping), or PLN 40. Below is a screenshot of the offer (as I was buying, the price was probably slightly different):
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Working parameters according to the seller:
    Quote:

    Item Type: RGB Controler
    Material: Plastic
    Power Source: DC
    Voltage: DC 5-24V
    Max. Load Power: 96W
    Wattage: 96W
    Remote Distance: about 20m
    Applicable Lights: DC5-28V
    Oscillation frequency: 2.4G
    Model Number: WIFI 371
    Controled Method: Smart phone APP control
    Connection Mode: Commond connect
    Certification: CCC CE ROHS
    Features: Single Color WIFI controller

    Artwork from the seller:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    The product itself came to me in such a bag, without instructions but with QR codes:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    However, QR codes lead to:
    https://www.evernote.com/shard/s223/client/sn...cd37a43aef1599b0e3&sn=https%2F2.%3%ardote.com 2Fsh% 2Feb53e52d-3397-489b-979a-3b7ca059a3ce% 2F70498f1cd35bf8cd37a43aef1599b0e3 & title = USER% 2BMANUAL
    Below I am attaching the instructions from this link:
    Wi-Fi Ligh...Manual.pdf Download (995.51 kB)
    Wi-Fi LED ...Manual.pdf Download (2.02 MB)

    Pairing with the application
    Pairing is really very simple. The dimmer was detected automatically, I barely launched the SmartLife application on my Android phone (without that, you probably would have to put it into the Reset state by pressing the button for a long time):
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    The device is displayed under "bluetooth devices":
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    You need to enter the password of our WiFi network, it must be a 2.4GHz network (5GHz is not supported):
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Evaporation:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    After pairing, we get smooth brightness control and the ability to turn on / off via WiFi:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram


    LED strip test
    It's time to test with the LED strip, here the white strip at 12VDC, 5 meters, 4.8W * 5 = 24W (in practice it turned out to be smaller, but this is not the case).
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    For the test, I used the Twintex TP-1603 laboratory power supply. The output voltage is 12V, you can read the current from the photos. Additionally, a second "Watt Meter" is plugged in behind the tested device.
    Full brightness:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    50%:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    1%:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Let's see how the lighting power is regulated. Obviously, this is a 1kHz PWM. The LEDs are simply turned on for a given time and then turned off, but it is done so quickly that the human eye does not feel the flashing.
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    NOTE: Do not turn on such LED strip for more than a few moments without unfolding. It can get really hot.

    Interior
    There are no screws, we just pry up the base:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    And we immediately see the interior:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Unfortunately, this is not for any ESP8266 or ESP8285 (TYWE3S, TYWE2S). This is WB3S:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    WB3S, an energy-saving WiFi + Bluetooth module from Tuya, based on the BK7231T chip.
    Additionally, we have what looks like a converter and transistors:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    From the bottom, we have space for additional layouts. There are no programming pins. There are pins with roles:
    - IR-, IRIN - probably this board also supports remote control in another version ...
    - W, R, G, B - this PCB probably also supports separate control of 4 channels in a different version (separate PWM for R - red, separate for G - green, etc., red green blue white).
    Let's take a better look at the inverter:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    The converter is a xl1509-3.3e1 by XLSemi.
    It is more precisely a step down converter (buck) which works on input voltage from 4.5V to 40V, and gives 3.3V at the output (there are also versions giving 5V and 12V). So this circuit provides power to the WB3S.
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    There are still transistors. The designation for R0 might point to a few different ones, but my searches show that these are probably CJ3400 or similar:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    So MOSFET transistors with an N channel in the SOT-23 housing, with a very low RdsON, just right for switching high currents.
    There is also a fuse on the board, which is always a plus in this type of product.

    Diagram
    Finally, I decided to sketch a schematic of the entire circuit. It is based on the Eagle and diagram in Application Note XL1509.
    First, the 'rough draft':
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    And the diagram:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    A few notes about the scheme:
    - on the board we have 5 places for transistors (4 of them are occupied), but only one transistor is used (I do not know why the others are soldered, maybe the manufacturer initially made the RGBW version and then changed his mind)
    - transistors are controlled by the PWM outputs of WB3S (PWM frequency is 1kHz)
    - I have the impression that there is one additional diode on the board that is not in the diagram, it is related to the step down converter circuit, probably there is some additional protection

    Catalog notes of the elements from the inside:
    CJ3400_C19...ech-CJ.pdf Download (169.13 kB)
    XL1509 dat..eet.pdf Download (383.28 kB)
    BK7231T CO...tation.pdf Download (6.07 MB)
    WB3S Modul...cs (3).pdf Download (636.03 kB)

    Test under load - 48W
    I was about to finish, but I was tempted to check how much this device heats up, at the beginning with a load of 48W. For this I used 50W 5.6 ? wire resistors, two connected in parallel give 2.8 ?. When powered by 12V, a current of about 4.28A should flow, but this is without taking into account the voltage drop across the MOSFET in the center of the circuit.
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Test circuit - Twintex TP-1305 power supply. At 12V, it flows at 4.11A:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    After a few hours:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Only 35 ° C, so approx.


    Test under load - 75W
    At around 48W it was okay, what will be at 75W? According to the manufacturer, up to 96W is ok ... we will check. I increased the voltage to 15V:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    After about an hour:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    A little later - a sad surprise. There must have been damage, burnout of the transistor and an interruption of the circuit:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    75W was too much for this device.

    Repair after damage
    Well, now let's look inside what broke. Initial test shows that the WiFi module is still working and the phone sees the device:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    The defect is obvious - the transistor has burned out. The resistors are ok. The transistor is now a break in the circuit:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Fortunately, we have three spare pieces, right next to the PCB. As I wrote earlier, they are not used by the system, I do not know why the manufacturer soldered them there.
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    After replacing the transistor, everything works again:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram


    Can the device be controlled when we disconnect the router from the Internet (but the phone and the device are in one LAN)?
    I checked it by simply disconnecting quite the main cable from the router. I don't have any mobile internet on my phone, so my LAN has been separated from the world:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    Even so, you can still control the brightness from the app. Another plus for this product.

    Summary
    The product works well with the SmartLife application, but unfortunately we cannot upload open software such as Tasmota / Domoticz because it is not implemented on ESP, but on WB3S. This greatly limits the potential use of it in DIY.
    The only hope is that the outputs are compatible with TYWE3S / ESP12 so that it can be easily soldered there, but then I do not know about PWM - maybe they would have to be implemented by software.
    As for the rest of the circuit, the 3.3V power supply is done on the XL1509 step down converter and the switching (and PWM dimming) on the CJ3400. In addition, you can see that the product was initially prepared to separately control the RG and B channels of the strips, there are even additional transistors soldered to it. Maybe it could be modified to support it, if the WB3S SDK was run (in fact, you could probably even modify it to control ws2812b, only then you need a separate power supply and a separate pin with the control signal).
    In terms of power, the product can handle around 48W of the load without any problems, while 75W is too much for it and ends up with a burnout of the transistor. So the seller is exaggerating a bit by advertising it as "up to 96W". But I didn't expect that much power anyway, so the 48W LED strip on one transistor is also good.
    Anyway, it's not bad, but I'll be looking for a similar product anyway, only for ESP.

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    About Author
    p.kaczmarek2
    Moderator Smart Home
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    p.kaczmarek2 wrote 3280 posts with rating 4507, helped 122 times. Been with us since 2014 year.
  • #2
    bumble
    User under supervision
    Cool. I can't see Alexa cooperation tests. No external control tests. For example, a device connected to the home WiFi network and control from a phone from the mobile Internet, we do not know if it has a cloud to work with. We do not know if it works directly from the phone or via a router.
  • #3
    p.kaczmarek2
    Moderator Smart Home
    bumble wrote:
    No external control tests. For example, a device connected to the home WiFi network and control from a phone from the mobile Internet, we do not know if it has a cloud to work with. We do not know if it works directly from the phone or via a router.


    It was tested at the beginning of the series (probably one of the linked topics) and I do not repeat these tests anymore as there is another device from the SmartLife / eWeLink / Tuya / Blitzwolf series. If I would describe it separately for each device in this series, it would be too boring topics.

    But it works via the Internet, normally it goes through the manufacturer's servers, besides, their applications require account registration (you need to enter an email, no phone number, I did it on a phone without a sim card).

    And with that Alexa, I'll think about it.
  • #4
    bumble
    User under supervision
    Yes, I know. I have several devices that work with this application. However, I chose Mi-Light to control the lighting. In addition to the app and Alexy, they offer remote control and wall panels. My bulbs from this APP work with Alex without any problems.
  • #5
    398216 Usunięty
    Level 43  
    p.kaczmarek2 wrote:
    I do not know why the manufacturer soldered them there.
    To me, it looks like a PCB "universal" for various programs - from one channel / color to 5. Contrary to appearances, making a PCB for full filling in SMD and only partially does not differ significantly in costs. The manufacturer has more freedom in what he produces - it all depends only on the uploaded program.
  • #6
    Karol966
    Level 30  
    Is the layout of the photo known?
    I'd like to modify it. Add a relay control output (if RGB works, it should disconnect the main lamp and enable full 100% PWM on all channels because G / B are about 80%).
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
  • #7
    p.kaczmarek2
    Moderator Smart Home
    I think I have it:
    WiFi SmartLife single-color LED strip dimmer - test, interior, diagram WiFi SmartLife single-color LED strip dimmer - test, interior, diagram
    The programming and configuration procedure is as follows:
    https://www.elektroda.pl/rtvforum/topic3932026.html
    A relay operating alternately in RGB could be scripted in OpenBeken