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UART TTL Bluetooth Module -- BC4

$19.50  $16.90
Sale: $16.06
Save: 18% off
  • Units in Stock: 406
  • Date Added: Monday 08 February, 2010
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Product Description:

UART TTL Bluetooth Module -- BC4

Industrial serial port bluetooth, Drop-in replacement for wired serial connections, transparent usage. You can use it simply for a serial port replacement to establish connection between MCU and GPS, PC to your embedded project and etc.

The current firmware is the latest version. The default setting for serial port [9600, N, 8,1], paging code: 1234

Parameters can be changed via AT command, including the baud rate, device name, passkey, master or slave mode (master-slave mode can be modified by AT commands)

Product Specifications

  • Bluetooth protocol: Bluetooth Specification v2.0 + EDR
  • USB protocol: USB v1.1/2.0
  • Frequency: 2.4GHz ISM band
  • Modulation: GFSK (Gaussian Frequency Shift Keying)
  • Transmit power: ≤ 4dBm, Class 2
  • Sensitivity: ≤-84dBm at 0.1% BER
  • Rate: 2.1Mbps(Max)/160 kbps(Asynchronous);1Mbps/1Mbps(Synchronous)
  • security features: Authentication and encryption
  • Support profiles: Bluetooth serial port (master & slave)
  • Power Supply: +3.3 VDC 50mA
  • Operating temperature: -20 ~ +55 Centigrade
  • Dimensions: 26.9mm x 13mm x 2.2 mm

Typical application schematic, power and 2-line RS232 (TTL) interface:

Pin definition:

  • PIO8 connects with LED cathodea with 470ohm series resistor in between. LED NEGATIVE connects to ground. It is used to indicate the module state. After powered on, flashing intervals differ in different states.
  • PIO11, module state switching pin. HIGH -> response to AT command; LOW or floating -> regular work status.
  • With build-in reset circuit, reset is completed automatically after powered on.

Steps to set to MASTER:

  1. Set PIO11 HIGH with a 10K resistor in between.
  2. Power on, module comes into AT Command Response Status
  3. Open HyperTerminal or other serial tool, set the baud rate 38400, 8 data bits, 1 stop bit, no parity bit, no Flow Control
  4. Via serial port, send characters "AT + ROLE = 1\r\n",if successful, return "OK\r\n", where \r\n is carriage return.
  5. Set PIO11 LOW, re-power, then in Master state, automatically search for slave module and connect.

Other Document

  1. Click here to get schematic
  2. Click here to get its mannual
  3. Click here to get the AT command manual
  4. Click here to get reference document

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