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| This page documents roughly how to do this and my hardware findings. | | This page documents roughly how to do this and my hardware findings. |
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| Update: I've posted this page as a teardown on the Elektroda forum: [https://www.elektroda.com/rtvforum/topic3969247.html <nowiki>[BK7231T] Connect 10W Smart RGB Bulb</nowiki>]. I've also had my information for this merged in to [https://openbekeniot.github.io/webapp/devicesList.html OpenBeken's device list]. If you have this bulb just follow regular instructions!
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| == Compatibility == | | == Compatibility == |
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| * Newer versions that use a WB2L chip | | * Newer versions that use a WB2L chip |
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| This bulb is still sold so it's likely there are other versions too. | | This bulb is still sold so it's likely there are newer versions too. |
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| These product IDs of the bulb have not changed between revisions, so there is no way to know if the version you have is the version I have. | | These product IDs of the bulb have not changed between revisions, so there is no way to know if the version you have is the version I have. |
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| | As always, follow random instructions online at your own risk. You may brick your lightbulb. |
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| == Software == | | == Software == |
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| The bulb connects to the Tuya cloud, but also supports discovery and API interactions over the local network. You can get API keys for local access using Tuya's developer APIs. These will work even if Tuya drops support for your device. At least until you have to factory reset the device. | | The bulb connects to the Tuya cloud, but also supports discovery and API interactions over the local network. You can get API keys for local access using Tuya's developer APIs. These will work even if Tuya drops support for your device. At least until you have to factory reset the device. |
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| Alternatively you can disconnect the bulb from Tuya's cloud using [https://github.com/tuya-cloudcutter/tuya-cloudcutter Tuya Cloudcutter]. This software creates a local Wi-Fi network and exploits the bulb's factory reset mode. It can then permanently disconnect the bulb from the cloud or send a firmware upgrade. | | Alternatively you can disconnect the bulb from Tuya's cloud using [https://github.com/tuya-cloudcutter/tuya-cloudcutter tuya-cloudcutter]. This software creates a local Wi-Fi network and exploits the bulb's factory reset mode. It can then permanently disconnect the bulb from the cloud or send a firmware upgrade. |
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| When it comes to firmware currently the only open source firmware is [https://github.com/openshwprojects/OpenBK7231T_App OpenBeken]. This firmware is highly configurable and provides an interface over MQTT and HTTP. Installation requires setting up device pins manually, but this isn't too hard.
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| == Installation ==
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| Warning: Read all appropriate documentation and warnings for Tuya Cloudcutter and OpenBeken. If your bulb does not have the same chipset as mine it's possible you will brick your device. Follow their installation instructions instead of mine if possible.
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| Installation is roughly these steps:
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| * Set up Tuya Cloudcutter using their instructions
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| * Grab the BK7231T firmware in CCtr format from OpenBeken
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| * Place it in the custom-firmware directory
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| * Run Tuya Cloudcutter and select update firmware mode
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| * Select a device by firmware (I used <code>oem-bk7231s-light-ty-1.1.2-sdk-2.0.0-30.06</code>)
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| * Select the firmware you've downloaded
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| * Follow the instructions
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| *Connect to the bulb's Wi-Fi access point
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| * Open this address in your web browser: <nowiki>http://192.168.4.1/</nowiki>
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| *Configure the bulb's Wi-Fi access point
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| *Re-connect to your regular Wi-Fi network
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| Configuration is done using these steps:
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| * Find the IP of your bulb using your router page
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| * Open the IP in your web browser, in a URL like this: <nowiki>http://192.168.1.5/</nowiki>
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| * Go to the configuration page
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| * Go to the 'Configure Module' page
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| * Set P6 (PWM0) to PWM role, channel 1
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| * Set P7 (PWM1) to PWM role, channel 4
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| * Set P8 (PWM2) to PWM role, channel 3
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| * Set P24 (PWM4) to PWM role, channel 2
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| * Set P26 (PWM5) to PWM role, channel 0
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| * Save the configuration
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| * Return to the original bulb page
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| * Test that you can set the light colour
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| That should be it! If you manage to install OpenBeken but the configuration goes wrong you might need to ask online for some help.
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| == Hardware == | | == Hardware == |
| The bulb is a bayonet mount, B22.
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| The bulb label has the following written on it:
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| * LSH-B22RGB10W;
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| * CSH-B22RGB10W
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| * Input: 220-240VAC, 50/30Hz
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| * Output: 10W
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| * Wi-Fi: 2.4GHz
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| * Batch No.2002672
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| * www.laserco.com.au
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| The power PCB has the following features:
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| * 240V AC input
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| * 340V DC rectifier
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| * 12V output using a capacitive dropper
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| * GND, 12V and VIN output pins
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| * VIN is supplied by the 340V DC source
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| The main PCB has the following features:
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| * The label 'MK-A85(wifi)-44amd2836-dlx01 (HY)20/33'. The A8 is hard to read and possibly wrong
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| * The label '30903772 2020-5-18'. The 9 is hard to read and possibly wrong
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| * A 3 pin connector labelled VIN, GND and 12V. This connects to the power PCB
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| * An 8 pin connector labelled in anti-clockwise order: GND, 12V, unlabelled, B, R, G, W, C. This connects to the Wi-Fi PCB
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| * 4 groups of R, G and B LEDs
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| * 16 C LEDs
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| * 16 W LEDs
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| * A KP18055ESP chip connected between the 8 pin connector's C and W pins and the C and W LEDs
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| The Wi-Fi PCB has the following features:
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| * An 8 pin connector labelled in anti-clockwise order. It is unlabelled and connects to the main PCB
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| * A 3.3V voltage regulator that seems to be a switching power supply
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| * The WB2L chip with 7 pins: 3.3V, GND, PWM4, PWM5, PWM0, PWM1, PWM2
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| * A sticker label with the text 'Model: WB26 P/N: 30904213 S/N: 100003493012FB' and the serial number as a QR code
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| * A BP1633 chip connected between the WB2L chip's PWM4, PWM5 and PWM0 signals and the 8 pin connector's B, G and R pins
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| *The PWM1 and PWM2 signals connect to the 8 pin connector's W and C pins
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| The RGBCW signals are laid out like this:
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| * The WB2L's PWM4, PWM5 and PWM0 signals drive the B, G and R LEDs via the BP1663 chip
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| * The WB2L's PWM1 and PWM2 signals drive the W and C LEDs via the KP18055ESP chip
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| == Gallery==
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| Here are some images of the bulb and its insides. Please note that this page serves as a full textual description of the bulb, so the pictures will have simple descriptions.<gallery>
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| File:CSH-B22RGB10W Bulb.jpg|The bulb, unopened
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| File:CSH-B22RGB10W Label.jpg|The bulb label
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| File:CSH-B22RGB10W Lamp PCB.jpg|The main PCB
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| File:CSH-B22RGB10W WiFi PCB Top.jpg|Wi-FI PCB, top
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| File:CSH-B22RGB10W WiFi PCB Bottom.jpg|Wi-Fi PCB, bottom
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| File:CSH-B22RGB10W KP18055ESP.jpg|KP18055ESP chip
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| File:CSH-B22RGB10W BP1633.jpg|BP1633 chip
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| File:CSH-B22RGB10W Signals.jpg|A visual map of the RGBCW signals on the board
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| File:CSH-B22RGB10W PCB Traces.jpg|The main PCB with traces more visible
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| </gallery>
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| [[Category:Hardware]]
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