LeiZe Smart Home Assistant Smart Switch - Double Switch

Risk Warning:
This project involves 220V high-voltage electricity, and there are serious electrical risks during use.
Please ensure you have professional electrical skills or seek support from a professional electrician for installation and operation.
You are solely responsible for any electrical risks, and we are not liable for any loss or damage caused by the use of this project.
Project Background:
I bought several learning materials from people on Douyin and Xiaohongshu (TikTok) who made a wireless switch for just over ten yuan
; I found that while what they said was correct, many pitfalls were not clearly explained...

The biggest pitfall is that the single 8266 relay module requires 5V power; our switch at least needs a power converter to actually fit into the base.
The second pitfall is that besides mobile phone control, there is no panel control; it's a pseudo-smart switch (originally, operating the switch only required pressing one button, now it requires opening the phone - opening the app - pressing the button; this is a nightmare for the elderly)

. Special thanks to LCSC Open Source Community and Bilibili. From being a complete novice, I gradually learned how to design circuit boards, solder, order PCBs, write code, debug, 3D model, find factories, etc.; finally, I created my own product:
Leize Smart Home Assistant Smart Switch 86-type WiFi Double Switch
Real Shot Effect Image 1
Real Shot Effect Image 2
Internal Image Front
Internal Image Back
DIY Related Features

Zero Fire
Version The design employs a layered approach: **
The bottom layer is the circuit layer, containing the basic circuit layout (also the part open-sourced in this project).
The middle layer (under design) serves as the control layer, which I envision can freely connect various control buttons or sensors.
The outer layer serves as the appearance layer, allowing for customization of various panels to meet the personalized needs of our users.


Currently, the bottom layer consists of two relays that can control two physical circuits.
The main controller uses an ESP12F, i.e., Wi-Fi 2.4G control; its main advantage is its affordability, at 5.2 RMB per piece on 1688, though shipping is not included, so remember to buy a few extra.**
The 2x4 header in the middle is used to install the TP223 touch control chip. Considering there are two types of TP223 modules on the market, a special layout was arranged to ensure
chip programming is possible for both. It is recommended to program the chip before soldering. However, I also brought out a 2x4 header in the upper right corner, which can also be used to connect serial port chips for programming (but remember to solder the resistors and capacitors according to the technical manual first).
GPIO13/GPIO16/ADC are also brought out in the upper right corner for future sensor module design in the control layer.
The AC-DC module, casing, and copper terminals are all mass-produced generic films, available on Taobao/1688.
The BOM table is exported by JLCPCB by default; please refer to the list below for the actual module purchase.

Images of two different priced TTP223 chips are shown: the one on the left is 1.5 RMB with soldered pins, and the one on the right is 0.3-0.6 RMB with self-soldered pins.
For questions, please contact WeChat: rez-ti.
I have created self-media accounts on Xiaohongshu and Douyin: Kevin_SmartHome; currently, I don't have many followers. If you like the project, please follow and like it to make friends.
Cost Estimate and Purchase Recommendations:
Estimated cost per unit: 21.58 RMB (excluding shipping, soldering costs, etc.)

ESP12F: 5.2
Copper pillars x4: 1.52
Power module: 3.5
Relays x2: 2.4
JLCPCB: 2.1
Housing: 1.7
Tempered glass panel: 3
Capacitors, resistors, voltage regulator chips, etc.: 1
Female connector x2: 0.56
Note: Not all accessories include shipping, so the cost will be higher if shipping is considered; also, some accessories can be priced more favorablely (for example, if you have a JLCPCB coupon, the PCB is free). Purchase channel:
Attached is the store where I placed the order and the description:





Accessory name,
channel,
original purchase link
, Note:




ESP12F
1688
【ESP8266 serial WIFI remote wireless control wifi module ESP-12E ESP-12F ESP12S】 Copy ￥o3eYl8k00ugaz￥, open 【Mobile Alibaba】 to view: https://qr.1688.com/s/NR5bfNOR CZ2333



Copper Pillar
on Taobao
[Taobao] https://m.tb.cn/h.gbGpnn3cRR4WFik?tk=LloVWsl0gor CZ3458 "Copper Pillar with M3 Screws, Smart Switch Terminal, 9.5mm High Wiring Copper Pillar Terminal, Custom Made, Three Sizes Available" Click the link to open directly or search on Taobao.
Shipping fee: 6 yuan.


Power Module
on Taobao
[Taobao] https://m.tb.cn/h.g0xf3GZ3g8Z9b8N?tk=CLPDWslYW09 CZ3456 "[Youxin Electronics] 5V 700mA (3.5W) Isolated Switching Power Module AC-DC Regulator/220 to 5V" Click the link to open directly or search on Taobao.
Price fluctuates.


Casing
: 1688
【New Wholesale 86-type Smart Touch Switch Shell Can Pass Certification Flame Retardant V0 Grade Material】Copy ￥Qr4Nvtc30eSaf￥, open 【Mobile Alibaba】to view: https://qr.1688.com/s/3News4hT CZ6949
Express fee 12 yuan


Capacitors, resistors and other auxiliary materials
Taobao
same power supply, Shenzhen Youxin
Electronics 10uf, 100nf capacitors, 10k resistors, 1k


transistors

【Taobao】https://m.tb.cn/h.g0xUQGlDSYdHYuL?tk=LHqFWslXUIp CZ0016 "【Youxin Electronics】SMD S8050 J3Y SMD Transistor 500MA SOT-23 (20 pieces)" Click the link to open directly or search for



diodes on Taobao

【Taobao】https://m.tb.cn/h.gbGszWMM3oi1cdM?tk=vPH3WslXL7N CZ0015 "Original Authentic SMBJ5.0A DO-214AA 5V/Single-Directional TVS Transient Voltage Suppressor Diode (10 pieces)" Click the link to open directly or search for "



voltage regulator chip" on Taobao.

[Taobao] https://m.tb.cn/h.gb7rJa4blBbcrKI?tk=JXe9Wsl2DFq MF6563 "AMS1117-3.3V 1.2V 1.5V 1.8V 2.5V 5.0V ADJ voltage regulator chip SOT223 power step-down IC" Click the link to open directly or search on Taobao
to buy a 3.3V


relay .
(Taobao price
: 68 yuan) [li4CWsldfDM]