【Training Camp】Internet of Things Dynamic Light String + 997406A

1. Flashes according to the rhythm of music
2. Can be controlled by mobile phone, user can manually adjust
3. Try to access AI scene

## WB3S WiFi&BT dual-mode module

[WB3S module specification](%5Bhttps://developer.tuya.com /cn/docs/iot/device-development/module/wifibt-dual-mode-module/wb3s-module-datasheet?id=K9dx20n6hz5n4%5D(https://developer.tuya.com/cn/docs/iot/device -development/module/wifibt-dual-mode-module/wb3s-module-datasheet?id=K9dx20n6hz5n4))

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Either several pins were welded together, or they fell off after welding... After a few days, several resistors melted.
There was no response after powering on without any suspense. It seemed that after soldering, I found that there were missing components. In addition, the circuit diagram and PCB diagram were copied, but I found that the component numbers did not match, so I looked at the diagram carefully before soldering. I don’t know if I soldered it correctly.
This training camp ended in failure, which made me fully realize: welding is also a technical job!
For me who have never been exposed to hardware, the following is my enlightenment homework. Thank you teachers for your careful guidance, I am disappointed!

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However, today I discovered that STM can be used to mount patches. I no longer need to solder those tiny resistors and other components by myself. With a learning attitude and the pleasure of picking up wool, I ordered another 10 PCBs, two of which were soldered. I bought the voltage regulator I missed, and I look forward to seeing my complete work in the future.
This training camp cost a lot of money. If it can't be completed, dozens of dollars will be wasted, but the hands-on practice is great. In the future, you can really develop the Internet of Things from scratch (Copy diagram - board making (the kind that includes welding) - software development).