Application of intelligent voice control (fish tank) module

The core uses the HLK-V20 module to create a multi-channel voice control module for offline home voice control. It allows for independent control of multiple channels. My wife isn't a big fan of fish, saying they're boring because they can't talk, so I decided to get a smart system for the aquarium, providing remote voice control for adding water, changing water, aeration, lighting, feeding, etc. It's similar to a smart voice speaker, enabling precise multi-channel voice control. It can even make some sounds; overall, it's quite interesting. A smart aquarium.
The module has some redundant design features. It's necessary to consider the usage of other parts of the module, so some seemingly unnecessary parts are actually carefully reserved. This facilitates future adaptation to different relays, different power supply methods, and devices controlling different voltages. The passive design allows for adjustment of normally open and normally closed states by adjusting the soldering points to the relays. It also allows for selection of whether the device is on or off when energized, making adjustments based on the actual operating time of the equipment.
For low-voltage, low-current applications, a low-voltage drive of around 12V and 0.5A is sufficient, even down to the transistor. For higher voltage and current requirements, a relay is necessary for safety and reliability. It can generally drive 40W or 60W lights without issue. To drive high-power appliances like kettles or air conditioners, a low-voltage-to-high-voltage control is required at the end. Connect an AC contactor to the drive to prevent damage to offline devices.

 
Extension:
The design allows you to customize control command names and wake-up methods. Connect the corresponding devices and appliances as needed (do not operate high voltage without proper training to avoid danger). Voice wake-up association is also possible for two or more devices, which is particularly suitable for multi-device use and allows for modular management of areas. For example, after offline voice wake-up in the living room, it can be set up to issue a wake-up word to wake up other modules, making smart offline whole-house control possible. Those interested can try it out, paying attention to distance and word settings.