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Author Topic: Arduino connection via Bluetooth  (Read 4654 times)

GigiG

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Arduino connection via Bluetooth
« on: January 25, 2015, 15:10:33 »
Hi, I was wondering if there was any way to connect the AstroEQ board to PC via Bluetooth using a device like the HC-06 module. I was thinking about using the RX-TX pins on the Arduino Mega.
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TCWORLD

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Re: Arduino connection via Bluetooth
« Reply #1 on: January 25, 2015, 15:54:39 »
Would work fine, just connect it to the RX0 and TX0 lines of the Mega, set the baud rate of the BT module to 9600, and away you go :)
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Tom Carpenter (AstroEQ)

GigiG

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Re: Arduino connection via Bluetooth
« Reply #2 on: July 20, 2015, 15:45:38 »
Hi Tom, the HC-06 modules I got have RX and TX pins at 3.3V voltage levels. The Arduino board's pins works at 5V. There could be problems with long duration usage? As for now I tested only for short duration time.
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TCWORLD

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Re: Arduino connection via Bluetooth
« Reply #3 on: July 20, 2015, 18:44:01 »
It's not ideal to drive it with +5V. Putting a 1k or so resistor between the TX of the Arduino and RX of the Bluetooth module would help, though a potential divider circuit (say 1.5k from Arduino to Bluetooth RX and 3.3k from Bluetooth RX to ground) would be a better approach.

There are many simple voltage divider circuits out there, including ones using a diode and resistor amongst other things. Given that the serial is relatively slow (9600 baud) any of these will work.

For Bluetooth TX to Arduino RX you shouldn't need anything.
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Tom Carpenter (AstroEQ)