HC-05 Bluetooth module

Model: HC-05.
INFO:
The HC-05 Bluetooth module allows us to connect our projects with Arduino to a smartphone, cell phone or PC wirelessly (Bluetooth), with the ease of operation of a serial port. The transmission is done completely transparently to the programmer, so it is connected directly to the serial pins of our preferred microcontroller (respecting the voltage levels, since the module is powered by 3.3V). All module parameters can be set by AT commands. The board also includes a 3.3V regulator, which allows the module to be powered with a voltage between 3.6V - 6V. This module is the ideal complement for our robotics, home automation and remote control projects with Arduino, PIC, Raspberry PI, ESP8266, ESP32, STM32, etc.

Bluetooth communication occurs between two types of devices: a master and a slave. If our objective is to connect our project to an android smartphone, we can use either an HC-06 module or an HC-05 configured as a slave. The HC-05 Bluetooth module is factory configured to work as a slave, that is, prepared to listen for connection requests, but we can configure it to work with a Master using AT commands. On the other hand, if our objective is to connect two projects, we will need to use an HC-05 module configured as master and an HC-06 (slave) or an HC-05 configured as slave.

This module complies with the specifications of the Bluetooth 2.0 standard that is perfectly compatible with Android cell phones or smartphones, but not with iPhones. To work with iPhone we recommend using the HM-10 Bluetooth 4.0 BLE Module, which is also compatible with modern Android cell phones.

Technical specifications:

Operating voltage: 3.6V - 6V DC
Current consumption: 50mA
Bluetooth: V2.0+EDR
Frequency: 2.4GHz ISM Band
Modulation: GFSK(Gaussian Frequency Shift Keying)
Transmit power: 4dBm, Class 2
Sensitivity: -84dBm at 0.1% BER
Range 10 meters
Communication interface: Serial TTL
Transmission speed: 1200bps up to 1.3Mbps
Default baudrate: 38400,8,1,n.
Security: Authentication and encryption
Working temperature: -20C to +75C
Android-compatible
Dimensions: 37*16mm
Weight: 3.6 grams