Design with HC-05 Bluetooth Module in Cirkit DesignerThe HC-05 Bluetooth module is a widely-used wireless communication device that enables Bluetooth connectivity for electronic projects. It operates in both master and slave modes, allowing it to either initiate a connection or accept connections from other Bluetooth devices. This versatility makes it ideal for a range of applications, including robotics, home automation, and Internet of Things (IoT) projects.
This circuit consists of an Arduino UNO microcontroller connected to an HC-05 Bluetooth module. The Arduino provides power to the Bluetooth module and facilitates serial communication between the two devices, enabling wireless data transmission.
Open Project in Cirkit Designer
This circuit features an Arduino UNO microcontroller interfaced with an HC-05 Bluetooth module for wireless communication. It also includes two 5V two-channel relay modules, which are connected to the Arduino for controlling external devices. The setup allows for remote control of devices via Bluetooth.
Open Project in Cirkit Designer
This circuit connects an HC-05 Bluetooth Module to an Arduino UNO for wireless communication. The HC-05's VCC and GND are connected to the Arduino's 5V and GND for power. The HC-05's TXD and RXD pins are connected to the Arduino's D11 and D10 pins, respectively, allowing for serial communication between the two devices.
Open Project in Cirkit Designer
This circuit features a Raspberry Pi Pico microcontroller interfaced with an HC-05 Bluetooth module for wireless communication, an HMC5883L compass module for magnetic field measurement, and a GPS NEO 6M module for location tracking. The Pico is configured to communicate with the HC-05 via serial connection (TX/RX), with the compass module via I2C (SCL/SDA), and with the GPS module via serial (TX/RX). Common power (VCC) and ground (GND) lines are shared among all modules, indicating a unified power system.
Open Project in Cirkit Designer| Pin Number | Name | Type | Description |
|---|---|---|---|
| 1 | KEY | Input | Module enters AT command mode when pulled HIGH |
| 2 | VCC | Power | Supply voltage (3.3V to 6V) |
| 3 | GND | Power | Ground |
| 4 | TXD | Output | Transmit Data (connect to RX of host device) |
| 5 | RXD | Input | Receive Data (connect to TX of host device) |
| 6 | STATE | Output | Indicates the connection status |
#include <SoftwareSerial.h>
SoftwareSerial BTSerial(10, 11); // RX | TX
void setup() {
pinMode(9, OUTPUT); // KEY pin if needed for AT commands
digitalWrite(9, HIGH); // Enable AT command mode
Serial.begin(9600);
BTSerial.begin(38400); // HC-05 default speed in AT command mode
Serial.println("Enter AT commands:");
}
void loop() {
// Keep reading from HC-05 and send to Arduino Serial Monitor
if (BTSerial.available())
Serial.write(BTSerial.read());
// Keep reading from Arduino Serial Monitor and send to HC-05
if (Serial.available())
BTSerial.write(Serial.read());
}
Q: How do I change the baud rate of the HC-05?
A: Enter AT command mode and use the command AT+UART=<baud rate>,<stop bits>,<parity> to set the desired baud rate.
Q: Can the HC-05 be used to communicate with smartphones? A: Yes, the HC-05 can communicate with smartphones that have Bluetooth capabilities.
Q: What is the default password for pairing the HC-05? A: The default password is usually '1234' or '0000'.