Bluetooth 5.0 BLE module RF transceiver Master...

Bluetooth 5.0 BLE module RF transceiver Master and Slave HC-42

Modules
DET522
Part.No: HC-42D
€14.95
In Stock
Immediate Dispatch

HC-42D Bluetooth 5.0 BLE transceiver module, 2.4GHz ISM band, 1.8–3.6V operating voltage, PCB internal antenna, GFSK modulation, up to 2Mbps air rate. Ideal for low-power wireless projects.

 

The HC-42D (MPN: HC-42D, OEM) is a Bluetooth Low Energy (BLE) 5.0 transceiver module designed for low-power wireless serial communication. Operating over the 2.4GHz ISM band at a supply voltage of 1.8–3.6V, it is purpose-built for makers, engineers, and hobbyists who need reliable BLE connectivity without sacrificing battery life. Its compact design with a PCB internal antenna makes it easy to integrate into space-constrained projects.

Key Features

  • Bluetooth Version: BLE 5.0 → Modern, widely supported protocol compatible with current smartphones and BLE-capable hosts
  • Frequency Band: 2.4GHz ISM → License-free, globally available wireless band
  • Air Data Rate: 1Mbps / 2Mbps → Flexible throughput for different range/speed trade-offs
  • Modulation: GFSK → Efficient spectral use with robust noise resistance
  • Max Transmit Power: 4dBm → Adequate range for typical indoor BLE applications
  • Receiving Sensitivity: −96dBm → High sensitivity enables reliable reception at extended distances
  • Working Voltage: 1.8–3.6V → Direct 3.3V compatibility with ESP32, Raspberry Pi, and STM32 platforms
  • Antenna: PCB internal → No external antenna required, reducing BOM cost and assembly complexity
  • Low Energy Protocol (BLE): Significantly lower power consumption vs Classic Bluetooth → Ideal for battery-powered IoT devices

Compatibility

  • ESP32 / ESP8266: Native 3.3V logic — direct connection, no level shifting required
  • Raspberry Pi: 3.3V GPIO — fully compatible
  • STM32 / other 3.3V MCUs: Direct interface supported
  • Arduino UNO / Nano (5V): ⚠ Requires a 3.3V voltage regulator and logic level shifter on TX/RX lines, as the HC-42D operates at max 3.6V

Typical Applications

  • IoT sensor nodes: Transmit temperature, humidity, or environmental data wirelessly to a smartphone or BLE gateway
  • Wearable electronics: Low-power BLE communication for fitness trackers or health monitors
  • Remote control systems: Control robots, drones, or RC vehicles via BLE from a mobile app
  • Serial wireless bridge: Replace wired UART connections between two microcontroller boards
  • Smart home automation: Integrate BLE-based peripherals into Home Assistant or custom automation hubs

Technical Specifications

Parameter Value
Bluetooth Version BLE 5.0
Frequency Band 2.4GHz ISM
Air Data Rate 1Mbps / 2Mbps
Modulation GFSK
Working Voltage 1.8 – 3.6V
Max Transmit Power 4dBm
Receiving Sensitivity −96dBm
Antenna PCB internal

Frequently Asked Questions

Q: What is the difference between the HC-42D (BLE) and classic Bluetooth modules like HC-05/HC-06?
A: The HC-42D uses Bluetooth Low Energy (BLE 5.0), which consumes significantly less power than Classic Bluetooth. It is ideal for battery-powered applications but is not directly compatible with Classic Bluetooth devices. HC-05/HC-06 use Classic Bluetooth and are better suited for continuous streaming applications.

Q: Can I use the HC-42D directly with a 5V Arduino?
A: Not directly. The module's maximum supply voltage is 3.6V. You must use a 3.3V regulator for power and a logic level shifter for the UART TX/RX lines to avoid damaging the module.

Package Contents: 1× HC-42D Bluetooth 5.0 BLE Module

⚠ Warning: This module operates at 1.8–3.6V. Do NOT connect directly to 5V logic without appropriate level shifting. Exceeding the maximum voltage may permanently damage the module.
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