HC-05 - Bluetooth Module
Pin Number ; 1
Pin Name ; Enable / Key
Description ; This pin is used to toggle between Data Mode (set low) and AT command mode
(set high). By default it is in Data mode
Pin Number ; 2
Pin Name ; Vcc
Description ; Powers the module. Connect to +5V Supply voltage
Pin Number ; 3
Pin Name ; Ground
Description ; Ground pin of module, connect to system ground.
Pin Number ; 4
Pin Name ; TX – Transmitter
Description ; Transmits Serial Data. Everything received via Bluetooth will be given out by
this pin as serial data.
Pin Number ; 5
Pin Name ; RX – Receiver
Description ; Receive Serial Data. Every serial data given to this pin will be broadcasted via Bluetooth
Pin Number ; 6
Pin Name ; State
Description ; The state pin is connected to on board LED, it can be used as a feedback to
check if Bluetooth is working properly.
Pin Number ; 7
Pin Name ; LED
Description ; Indicates the status of Module
Blink once in 2 sec: Module has entered Command Mode
Repeated Blinking: Waiting for connection in Data Mode
Blink twice in 1 sec: Connection successful in Data Mode
Pin Number ; 8
Pin Name ; Button
Description ; Used to control the Key/Enable pin to toggle between Data and command Mode
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