5PCS HC-05 Wireless Bluetooth Receiver RF Serial Transceiver Module Master Slave Integrated Bluetooth Module 6 Pin Wireless Serial Port Communication BT Module

These are the master versions allowing connections to your Arduino projects. HC-06 is the Slave version. These all work as advertised and are easy to add to your project. Don't forget the passwords for base module is "1234"

script to write device name. /* * David Dold * JDDL Design, LLC * * HC-06 differs from an HC-05. HC-06 are slave only devices, whereas HC-05 can be master or slave. * By default, no BT connection, an HC-06 device in AT mode @ 9600 baud between * * An HC-06 does not respond to "AT" * * The response from an HC-06 device for "AT+NAMEwhatever" is OKsetname * * LEDs flashing on the HC-06 indicate command mode, steady indicate a BT connection. * * NOTE: If you maintain a BT connection, via a terminal session or mobile app, then the AT commands * will simply transmit to the connected device. * * The HC-06 spoc sheet calls for divided resistors and RX, I've never done it... * * TROUBLESHOOTING * If you are unable to get this to work, confirm your rx/tx pins are correct. Confirm your wiring with a Serial BT Terminal. * On Android there are many to choose from. Pair your HC-06 with your phone, then connect to the device via the BT terminal app, * LEDs on HC-06 go solid. Run this sketch. Characters sent from the send textbox via the serial monitor or sent from the app, * echo on the opposing device. If your characters do not appear, re-check your wiring (hint is tx/rx reversed?). * * If you are using seperate power supplies for your Arduino device -and- the HC-06, the grounds must be bonded. * * Setting baud rate is for the hardware connection between * processor pid and the HC-06 device. BT connection is negotiated * between radios. */ #include <SoftwareSerial.h> #define BLUETOOTH_TX 10 #define BLUETOOTH_RX 9 #define BAUDRATE 9600 SoftwareSerial bluetooth(BLUETOOTH_RX, BLUETOOTH_TX); void setup() { Serial.begin(BAUDRATE); Serial.println("ready"); pinMode(BLUETOOTH_RX, INPUT); pinMode(BLUETOOTH_TX, OUTPUT); //setup bluetooth bluetooth.begin(BAUDRATE); bluetooth.flush(); delay(1000); bluetooth.write("AT+NAMELifeMCP"); } void loop() { //optionally, send characters via the SerialMonitor, this can be commented out and the bluetooth.write in setup() works. //outbound to HC-06 if(Serial.available()) { Serial.println("writing to bt"); while (Serial.available()) bluetooth.write(char(Serial.read())); } //inbound from HC-O6 if(bluetooth.available()) { Serial.println("BT Response"); while (bluetooth.available()) { delay(3); Serial.print((char)bluetooth.read()); } Serial.println(); } }

These Bluetooth modules worked as expected. Really easy to set up and easy to use.

Funciona perfectamente

This HC-05 product, a pack of 5 pieces, only had one working unit. I don't recommend it to anyone.

I'm using this with an arduino to communicate with an OBD2 ELM327 in my car. The older HC-05 I used were version 2.0. These are version 5.0. The big difference for me is that the older HC-05 required an '$' to be prepended to commands intended to be passed-through to the ELM327. But the newer version 5.0 HC-05 units do not require it and just pass-through everything. The other issue Im working is that these newer units don't like the AT-INIT command for some reason. More later...

This set of Bluetooth modules is a great set for anyone who wants to learn how they work. I would highly recommend.

I was pleasantly surprised with how easy these were to use. I appreciate that the pins are labeled on the back of the circuit board. Be aware that there are 2 different voltages. Make sure to use a couple of resistors to get the voltage right. This will prolong the life of the module. Glad I bought a 5 pack. I will be using these on more projects.