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In 10 years of experience, we have had too many unforgettable stories with each of our customers. We have continued to work together on each order, and have also continued to enhance our relationship, slowly reaching a deep understanding.

Thanks to our customers’ absolute trust in us, our products have evolved from standard products from well-known brands such as Arduino, Raspberry Pi, Micro:bit, Makey Makey, etc. to gradually customized and personalized products. Product categories have also gradually expanded from DIY electronic products to CNC, 3D printing, drones, chips and other electronic products.

Looking back on the past, our winning advantage lies not in the lowest price, but in doing business in a down-to-earth manner and being a sincere person. We never deceive customers and sincerely cooperate with customers to solve every problem they encounter. We always adhere to one of the most important principles: allowing customers to find a real sense of security in cross-border procurement!

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Description

Product Description

The HC-05 Slave Board is a highly reliable Bluetooth 2.0+EDR (Enhanced Data Rate) module designed to add wireless serial connectivity to any electronic system. While the standard HC-05 is famous for its Master/Slave dual-role capability, this specific Slave-Optimized Board is pre-configured and hardware-tuned for seamless “Peripheral” operation. It acts as a wireless serial bridge, allowing your hardware to “listen” for connections from smartphones, tablets, laptops, and Master Bluetooth modules.

This board is the go-to solution for developers who need a “set-and-forget” wireless link. Once paired, it functions exactly like a physical serial cable—data sent to the module’s RX pin is wirelessly transmitted to the paired device, and vice versa. Built on a high-quality breakout board with an integrated 3.3V regulator and status LED, it is fully compatible with Arduino, Raspberry Pi, and Industrial PLC systems using standard TTL serial logic.

Key Features

Classic Bluetooth Compatibility: Fully supports Bluetooth V2.0 + EDR for maximum compatibility with older and modern Android and Windows devices.
Transparent Data Transmission: Once a connection is established, the module enters a “Transparent Mode,” passing serial data back and forth without any protocol overhead.
Optimized Slave Firmware: Pre-configured for high-stability slave operation, ensuring fast discovery and consistent pairing with master controllers.
Broad Voltage Range: The onboard power management chip supports an input voltage of 3.6V to 6V, making it compatible with both 5V USB power and battery packs.
Industrial Build Quality: Features a heavy-duty PCB with gold-plated pins and a clear status LED for visual diagnostics (Blinking = Searching; Steady/Double-Flash = Connected).
Full Customization: Supports a wide range of AT commands to change the device name, pairing PIN, and baud rate to suit specific project or branding requirements.

Additional information

Bluetooth Protocol	Bluetooth V2.0 + EDR (Classic)
Operating Voltage	3.6V – 6.0V DC
Operating Current	30mA (Pairing); 8mA – 10mA (Connected)
Logic Level (I/O)	3.3V (VCC is 5V compatible; RX requires 3.3V logic)
Frequency Band	2.4GHz ISM Band
Modulation	GFSK (Gaussian Frequency Shift Keying)
Default Baud Rate	9600 bps
Default Pairing PIN	1234 or 0000
Sensitivity	≤ -80dBm
Transmission Power	Class 2 (+4dBm)
Interface Pins	VCC, GND, TXD, RXD, STATE, EN/KEY