[Training Camp] Tuya IoT fill light main control board +492119A

1. Project establishment

Participated in the [Lichuang EDA Internet of Things Practical Training Camp] organized by Lichuang EDA, and the project adopted the [ Tuya IoT ] project.

I would like to thank Tuya IoT for providing it for free WB3S WiFi&BLE 双协议模组. Use the WB3S module to create a main control of RGBCW light string controlled by a mobile phone.

2. Draw schematic diagram

The schematic diagram is drawn using the domestic high-quality Lichuang EDA. By viewing the Tuya module document ( WB3S WiFi&BLE dual protocol module ), you can understand the basic information and draw the symbols, packaging and 3D model of WB3S through Lichuang EDA. Because I'm lazy, I just used the @SOEST author's symbols and encapsulation for free.

Other schematic diagrams can basically be copied from the engineering attachments 涂鸦云提供原理图.pdf. This schematic diagram uses 12V to 3.3V to realize 12V light strip control. I made a slight modification here and used AMS1117-5.0 and AMS1117-3.3 to convert 12V first. Convert to 5V, and then convert 5V to 3.3V, realizing a common control board for 12V and 5V common anode lamp strips.

The power supply selection is achieved through a patch switch to select 12V or 5V.

The interface chosen is a 6P Type-C female port (C283541). It is particularly easy to solder the components with a soldering iron. The power supply can be powered by a decoy device that supports 12V charger or power bank.

Special note is that in the hardware debugging part of the Tuya IoT platform, you must first configure the firmware, and then pass

View the pin configuration of the component.

The RGB lamp bead I chose is C193878, which is a 6-pin common anode RBG lamp bead. I made a mistake here, I didn’t read the lamp bead manual carefully.

The manual states that pin 1 of the lamp bead is B and pin 3 is R.

This is how it should be drawn, and I made an empirical error. As a result, when drawing the schematic diagram, pin 1 and pin 3 are drawn upside down.

3. PCB drawing

There is nothing much to say about PCB. I converted the schematic diagram into PCB through the function of Lichuang EDA 原理图转PCBand then arranged the layout myself. All traces and traces were drawn manually. Not a lot of wiring, so it was done easily! Below is a 3D preview.

4. Submit proofing

Because I draw relatively quickly, I feel that I have enough time, so I chose black as the color for the proofing. It looks so good. There is no problem with this, Jialichuang is as awesome as ever. Lichuang EDA provided a 20 proofing coupon, but I didn't use it here. I always felt that I would make mistakes, and then there would be a chance to modify it for free.

5. Welding

It's not difficult to weld, it just doesn't look good. The welder is such a scumbag!

6. Debugging

Thanks to the development-free module provided by Tuya, there is basically no need for debugging unless the design is wrong or the welding is not in place.

7. Demonstration

See the video!