ATtiny85 Based HC-12 Tester Kit Transmitter and Receiver Modules (with Relay Control)

This product is shipped from Sydney, Australia. 

Quickly Test Your SI4463 HC-12 Modules—No Coding Required!

This compact and easy-to-use ATtiny85-based tester kit is designed for makers, hobbyists, and developers who want a plug-and-play solution to test their HC-12 wireless serial modules. Whether you're building a long-range wireless communication project or just checking if your HC-12 modules are functional, this kit will save you time and effort.

🔧 Product Overview

The kit includes two preprogrammed modules—one transmitter and one receiver—built around the ATtiny85 microcontroller. Each module has a socket where you simply plug in your SI4463 HC-12 module. Once connected and powered via microUSB, the system is ready to go.

• 4 tactile switches on the transmitter:

  • Two switches turn ON the LED or an optional connected 5V relay module .

  • Two switches turn OFF the same outputs.

• The receiver module has a 3-pin female header to connect a 5V relay module or LED, enabling real-world testing of wireless control.

📶 About HC-12

The HC-12 is a powerful 433 MHz serial wireless transceiver module capable of transmitting data over up to 1,000 meters (1 km) in open space under ideal conditions. It uses transparent UART serial communication, which means it can replace wired serial connections without modifying your code.

• Frequency: 433 MHz

• Range: Up to 1 km (line of sight)

• Power Supply: 3.2V to 5.5V

• Baud Rates Supported: 1200 to 115200 bps

Note: Obstacles like walls, trees, or buildings may reduce the effective range depending on environmental factors.

🧪 How to Use the Tester

1. Plug an HC-12 module into both the transmitter and receiver units.

2. Power each board via 5V microUSB—you can use any mobile phone charger, USB port, or 5V power bank for portable use.

3. Press the buttons on the transmitter. The corresponding LED or connected relay on the receiver will turn ON/OFF wirelessly.

This makes it ideal for:

• Verifying if your HC-12 modules work right out of the box

• Quick functional testing before integrating into projects

• Learning and demonstration purposes