HC-42 nRF52832 Bluetooth V5.0 Module

The HC-42D is a Bluetooth 5.0 Low Energy serial port module built around the Nordic nRF52832 SoC, designed to add wireless transparent transmission to any device with a UART interface. It operates in the 2.4GHz ISM band using GFSK modulation, with a maximum transmit power of +4dBm and a receive sensitivity of -96dBm at 1Mbps. The module supports both master and slave roles in a single unit, configurable via AT commands, and delivers data at air rates of 1Mbps or 2Mbps. Its working voltage range of 1.8V to 3.6V makes it compatible with 3.3V logic systems, while the shutdown current of just 0.3µA supports long-term battery-powered operation. The onboard PCB antenna provides a reference range of approximately 40 meters in open air, and the UART interface allows direct connection to Arduino, STM32, ESP32, and other microcontrollers without complex RF design. With a compact footprint of 26.9mm × 13mm × 2.0mm, this HC-42 Bluetooth module fits into wearables, sensors, and space-constrained IoT endpoints. Whether the goal is to add BLE connectivity to an existing serial device or to build a transparent wireless bridge, this nRF52832 BLE 5.0 module delivers a well-documented, low-power BLE serial port module solution.

Application

1. Transparent serial data transmission between microcontrollers and smartphones, tablets, or computers.
2. Arduino, STM32, and ESP32 projects requiring a low-power BLE serial link.
3. Battery-powered sensors, remote monitoring devices, and wearable electronics.
4. Industrial data loggers, smart home nodes, and medical peripherals with UART interfaces.
5. Point-to-point wireless bridges and master/slave BLE networks configurable via AT commands.

Specifications

1. Model: HC-42D
2. Bluetooth version: BLE 5.0
3. SoC: Nordic nRF52832
4. Frequency band: 2.4GHz ISM
5. Modulation: GFSK
6. Air data rate: 1Mbps / 2Mbps
7. Working voltage: 1.8V to 3.6V DC
8. Communication interface: UART
9. Logic level: 1.8V to 3.6V (same as working voltage)
10. Transmit power: -40dBm to +4dBm
11. Receive sensitivity: -96dBm at 1Mbps
12. Shutdown current: 0.3µA
13. Antenna: PCB internal antenna
14. Reference range: approximately 40m at 2Mbps (open air)
15. Working humidity: 10% to 90%
16. Operating temperature: -25°C to +75°C
17. Storage temperature: -40°C to +85°C
18. Module dimensions: 26.9mm × 13mm × 2.0mm (length × width × height)