HC-05 Bluetooth Module Products
Created:
10Nov2023 21:16:59 UTC
2023-11-10T21:16:59Z
Updated:
10May2024 00:08:14 UTC
2024-05-10T00:08:14Z
Description
The HC-05 Bluetooth module is two way (full-duplex) wireless transceiver that can send/receive small amounts of data over short distances (nominal 10 meters or 33 feet). The HC-05 can only handle short data transmissions, such as logging or commands, but not for streaming audio or video. This is a classic Bluetooth 2.0 module with an IEEEInstitute of Electrical and Electronics Engineers (Industry Standards) 802.15.1 standardized protocol (it is not compatible with iOS devices such as iPhones or iPads that uses Bluetooth 4.0). It can operate in either Master or Slave mode: in Slave mode it waits for another Bluetooth device to initiate a connection, whereas in Master mode it actively searches for other Bluetooth devices to initiate a connection with.
The HC-05 module has a UARTUniversal Asynchronous Receiver-Transmitter interface with (RXReceive, TXTransmit) pins that can be controlled or configured by connecting it to a USB Serial Adapter or microcontroller board for data communication using ATShort text string commands where the AT stands for ATtention and every command line starts with "AT" or "at". commands. There are two modes of operation: AT mode and Data mode. In AT mode you can configure the settings of the HC-05 module (name, baud rate, PIN code, etc.). In data mode, the HC-05 can send wireless data and by reading from the UART port or receives wireless data and writes it to the UART port.
The board has a 3.3V LDOLow Dropout Regulator regulator and can be powered using a +3.6V to +6V DC supply voltage on the VCCVoltage Collector Collector (VCC) is the supply voltage at the collector of a transistor. The double subscript notation of repeating letters "CC" is used to denote a power supply voltage that is relative to ground. and GNDCommon Ground pins. However, the communication and control lines (RX, TX, State, and EN pins) have a 3.3V logic level and are not 5V tolerant, so you will need a level shifting circuitry if using a 5V microcontroller or USB Serial Adapter.
Specs
| Parameter | Description |
|---|---|
| Bluetooth Version | 2.0 + EDREnhanced Data Rate |
| Operation Modes |
|
| Communication Interface | UARTUniversal Asynchronous Receiver-Transmitter with ATShort text string commands where the AT stands for ATtention and every command line starts with "AT" or "at". Commands |
| Range | Approximately 10 meters (33 feet) in open air |
| Frequency | 2.4GHz ISMIndustrial, Scientific, and Medical radio bands band (2.402GHz to 2.480GHz) |
| Modulation | GFSKGaussian Frequency-Shift Keying modulation |
| Transmit Power | Class 2 (up to 4dBmDecibel-milliwatts (dBm) is a power level that expresses decibels in terms of milliwatts on a logarithmic scale.) |
| Sensitivity | -84dBmDecibel-milliwatts (dBm) is a power level that expresses decibels in terms of milliwatts on a logarithmic scale. (typical) at 0.1% BERBit Error Rate |
| Transmission Speed |
|
| Data Baud Rates (bpsbits per second) | 1200, 2400, 4800, 9600 (default), 19200, 38400, 57600, 115200, 230400, and 460800 |
| Supply Voltage | 3.6V to 6V DC |
| Operating Current |
|
| Operating Temperature | -20°C to +75°C (-4°F to +167°F) |
| Board Size (LxW) |
37.3mm x 15.5mm (1.47in x 0.61in)
Including Pin Header |
HC-05 Modules
- 1x HC-05 Module with plastic cover
- 1x User Guide
- 1x HC-05 Module with plastic cover
- 1x 6-Pin Dupont Cable
- 1x User Guide
- 1x HC-05 Module
- 1x HC-05 Module
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