Technical description of the LZC-Ι smart water heater controller, its hardware, software and safety features.
The document details the design of a smart home electric water heater controller named LZC-Ι. It explains the market need for intelligent water heaters, the design goals, and the overall system architecture, including both the main controller and a remote control unit.
Hardware design covers the MC68HC908GR8 microcontroller, power and clock circuits, temperature and water‑level sensing, leak detection, and protection mechanisms. Software design describes the main program, interrupt handling, temperature control, reservation function, and remote‑control processing. This manual is written in Chinese.
| Temperature display range | 0~99 °C |
|---|---|
| Adjustable temperature range | 20~80 °C |
| Microcontroller | Motorola MC68HC908GR8 |
| Flash memory size | 7680 bytes |
| Current consumption in wait mode | 12 mA |
The controller uses Motorola’s MC68HC908GR8 8‑bit microcontroller.
The user can set the water temperature anywhere between 20 °C and 80 °C.