@ -6,7 +6,26 @@ Yimian's Family IoT system in Taian.
## Objective
Combining the knowledge I have learned and using cutting-edge technology to benefit life has been my unremitting pursuit for a long time. In order to let my family experience a more stable, comfortable and intelligent lifestyle, and to consolidate the technical foundation and architecture experience accumulated in the school smartfarm project and my own ushio system, I decided to use 20 to 23 before going abroad. All day long, reconstruct the old IoT system at home. Adopt a layered architecture and interface-oriented, test-oriented, and **document-oriented** development principles, with **Available** and **Reliable** as the highest priority indicators to build an operational target 3. A highly modular, easy-to-remote control, open source home software and hardware intelligent sensor control system for more than years.
## Hardware design
### Single Chip Microcomputer Material Selection
Use Arduino UNO as the calculation unit. On the one hand, Arduino Uno has high reliability. My previous smart curtain system used Arduino Uno as the main control board, and it ran smoothly for one and a half years without hardware problems. On the other hand, Arduino Uno has a larger RAM, so there is no need to bother to program the microcontroller in order to compete for RAM.
The main disadvantage of Arduino UNO is its high price, but this cost is necessary to ensure long-term stable operation.
### WiFi communication module selection
Use ESP-01 as the WiFi communication module. The main reason is that the ESP-01 has been used to build a remote control car in the previous school courses, and I have a better understanding of its working methods and performance to reduce development costs.
### LoRa communication module selection
Use **Anxinke LORA RA-02 LORA** as the communication module between LoRa node and LoRa gateway. The reason is that this module is used in the surf project, so I understand it better.
### Smart speaker selection
As the most important interface for human-computer interaction in this IoT system, smart speakers play a pivotal role. After research, I use Tmall Elf Sugar R as a home smart speaker. On the one hand, the price/performance ratio of Tmall Genie is very cheap. Second, unlike Xiaomi’s development of Xiao Ai, the purpose of Ali’s development of Tmall Genie is to provide a platform that allows developers to access its network in various forms, which is very important to me.
### Light toggle switch
Initial idea: one-way control + reset device.
Actual realization: The original single-opening is transformed into double-opening, one is connected in series with the relay, and the other is connected with two pin ports.
GitHub