The software you will be using to contact the Bluetooth module (actually there are several varieties of software you can use) in this article will be demonstrated as being installed on a computer running Windows 7.įirst thing you will want to do is add the Bluetooth module device to your computer's group of Bluetooth devices. This is the code you will want to upload to your Arduino: The video shows how the 5VDC power supply powers the Positive and Ground rails of the bread board and the power into the Arduino 5VIN pin is also from the 5 volt bread board rail. The Arduino's pins only provide 40mA of current and the relay might need more than that so be sure and use a separate 5VDC power source for the relay and also tie all the ground points together. You do not want to power the relay from the Arduino if you can avoid it. All the links open in new tabs.Ī note on powering the configuration. I have written a tutorial on how relays work and you can read it here as well as a video How a Relay Works. It can be as simple as putting the positive lead of the LED into the 13 pin on the Arduino and the negative lead into the GRD pin. And since the configuration on whatever device you would like to turn on and off remotely can be done many different ways i will leave that ultimate decision up to you. And the Bluetooth TX is connected to the Arduino RX (pin 0). Make sure your Bluetooth RX pin is connected to the Arduino TX (pin 1). One point of maximum importance is the TX and RX connections between the Bluetooth and the Arduino. The narration is rather rambling and you might even find it annoying, but it does show a working configuration. I've made a video showing the setup and operation of the project if you'd like to watch it. I have written a tutorial on Logic Level Converters. But honestly I've never had any issues with sending a 5 volt signal to the Bluetooth module.
In the bread board layout I've included a Logic Level Converter (aka level shifter) which will take the 5 volt signal from the Arduino down to 3.3 volts before sending the signal on to the Bluetooth HC-06, which is reputed to like the 3.3VDC signal the best.
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