Hi there. For a project I'm working on, I need to send data from one Arduino to another using HC-05 bluetooth modules. Here is what I'm trying to accomplish: Arduino 1 -> Bluetooth 1 -> (wirelessly) Bluetooth 2 -> Arduino 2 So the first thing I did was configure one module as a master and one as …

Get the project working using wires between the arduino serial ports like below, then bring in the wireless part. makes troubleshooting much easier. Arduino 1 -> wires > Arduino 2

inkosi: So the first thing I did was configure one module as a master and one as a slave and then paired them (using this guide: Bluetooth HC05- How to pair two modules | alselectro ) You have two issues to address: proper communication, hence zoomkat's comment proper connection. There may be …

Thank you for the advice. ieee488, you are right they both are slaves by default. But I configured one of them to be a master by changing the ROLE command to 1. I took zoomkat's advice and successfully managed to get serial communication using wires, so I decided to try out wireless using the link …

Here are my connections: Arduino 1: PIN 10 - TX Bluetooth 1 PIN 11 - RX Bluetooth 1 GND -> GND of the other Arduino + Bluetooth 1 5V -> VCC Bluetooth 1 Arduino 2: PIN 10 - TX Bluetooth 2 PIN 11 - RX Bluetooth 2 PIN 2, GND - to LED anode + cathode respectively GND -> GND of the other Arduin…

If you want to try some direct serial testing, load the bottom non serial dummy code on both arduinos, then attach the bluetooth pins like below to the arduinos. This should allow direct communication between the two serial monitors via the bluetooth modules without having the arduino itself in the …

You have code BTSerial.begin(38400); // HC-05 default speed in AT command more This may not be a problem but reads as nonsense. The code is for use in communications made and the speed in AT mode is irrelevant. Since the command is for 38400, has the bluetooth been configured to work at the rat…

Thanks. I believe I have finally gotten it to work. The default communication rate is 9600 baud (38400 was only default for AT mode) so that was one error. Another error was, I believe, not having the KEY pin on my HC-05 module (I had a wakeup pin which I thought was the same thing -- but I think it…

I have a new task now. I need to make the communication two-way (to make a closed loop system). So my first idea was to make the slave HC-05 a master so it can send data back. However as soon as I do this (by simply changing AT-ROLE of the slave from 0 to 1), I am no longer able to receive data from…

inkosi: Thanks. I believe I have finally gotten it to work. Another error was, I believe, not having the KEY pin on my HC-05 module (I had a wakeup pin which I thought was the same thing -- but I think it isn't). I had to solder an extra wire from PIN34 of the HC-05 module. It might be best to c…

sending data from one arduino to another via bluetooth

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ieee488 March 14, 2016, 8:16pm 2

I believe that the HC-05 defaults to slave.

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sending data from one arduino to another via bluetooth

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