ChipScout

Communication

HC-05

Classic Bluetooth serial module used for Arduino UART wireless control demos.

China-madeGenericActiveModerate

Best For

Projects needing Bluetooth and UART with a commonly available communication part.

Avoid If

You need production-grade certainty without checking the exact module vendor, pinout, and library maintenance status.

Quick Decision Notes

HC-05 is indexed as a communication part from Generic. ChipScout tracks it by practical maker-facing dimensions: interfaces, library readiness, estimated price, field-level sources, and whether the page is strong enough for selection rather than only lookup.

Technical Specifications

FunctionBluetooth serialSource: Generic
InterfaceUARTSource: Generic
BluetoothClassic SPPSource: Generic
Working Voltage3.3V module / 5V tolerant boardsSource: Generic

Common Use Cases

  • Maker prototypes
  • Low-cost modules
  • Educational hardware

Known Issues

  • Breakout boards may use different pin labels or regulator choices
  • Clone modules can differ from the original datasheet part

Interfaces and Library Support

Interfaces
UART
Wireless
Bluetooth Classic
Voltage
3.3V
Libraries
Arduino verifiedMicroPython pending
Data Integrity72% confidence
Sourcehttps://components101.com/
Last verified2026-05-20
Core specsVerified
PinoutAvailable
Library supportChecked
Price rangePresent
Found a wrong spec?

Every field is meant to be source-backed. Corrections should include a datasheet URL, vendor page, module photo, or reproducible library test.

Submit correction

Source Resources

Datasheethttps://components101.com/GenericLibraryHC-05 Arduino library lookupArduino

Pinout Table

VCC3.3VPower the module from a rail that matches the breakout board, not just the bare IC.
GNDCommon groundConnect ground between the controller, sensor/module, and external power supply.
TXMCU RXCross TX to RX between the module and controller.
RXMCU TXCheck whether the module is 3.3V logic before connecting to 5V boards.

Pinout is not yet source-verified. Use the table as an integration checklist, then confirm exact pins against the module vendor page before wiring hardware.

Common Wiring

VCC

Power the module from a rail that matches the breakout board, not just the bare IC.

GND

Connect ground between the controller, sensor/module, and external power supply.

TX

Cross TX to RX between the module and controller.

RX

Check whether the module is 3.3V logic before connecting to 5V boards.

Arduino Example

void setup() {
  Serial.begin(115200);
  Serial.println("HC-05 GPIO wiring smoke test");
}

void loop() {
  // Replace with the maintained HC-05 library or module protocol.
  Serial.println("Read or toggle the connected signal pin.");
  delay(1000);
}
HC-05 Arduino library lookup

MicroPython Example

MicroPython support is pending. Treat community scripts as prototypes until a maintained driver is linked and tested on a known development board.

Recommended Development Boards

ESP32-C3 development board

Low-cost Wi-Fi/BLE board with enough interfaces for most sensors and modules.

Arduino Uno R4 / compatible

Good baseline for beginner wiring and library validation.

Raspberry Pi Pico W

Practical MicroPython target for I2C, SPI, UART, PWM, and ADC experiments.

Alternative Model Reasons

A7670CCommunicationThis alternative currently has stronger source coverage and confidence in ChipScout.
ATGM336HCommunicationThis alternative currently has stronger source coverage and confidence in ChipScout.
BC26CommunicationCompare this option when price or module availability is the deciding constraint.
CC1101CommunicationThis alternative currently has stronger source coverage and confidence in ChipScout.

Common Questions

What is HC-05 best used for?

Projects needing Bluetooth and UART with a commonly available communication part.

Does HC-05 support Arduino or MicroPython?

HC-05 has verified Arduino support and MicroPython support pending verification.

What interfaces does HC-05 use?

HC-05 lists UART; wireless support is Bluetooth Classic.

Compare HC-05 vs A7670C

Alternatives and Related Parts

A7670C

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BC26

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CC1101

Texas Instruments

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