Using Arduino offical robot with HC-05 Bluetooth modul

Projects Discussion and Showcase Robotics
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Hi, I would appreciate help with my school project, with is very important to me.

I am trying to connect two official Arduino robots with bluetooht using HC-05 bluetooth modul.
I managed successfully connect this module with arduino mega 2560, but when I moved to arduino robot I wasn´t managed to find wat to conet HC-05 modul with that robot using UART communication.
It was easy on arduino mega 2560 where there is easy to find RX and TX ppin but there is nowhere to find on arduino official robot.

Do anyone have any experience with arduino official robot or have any Idea how can I connect it with eatch other? I will be happy for any help you can get me since my deathline is in a month.

2

RX and TX ppin but there is nowhere to find on arduino official robot.

You are correct that the Serial UART pins you need are not broken out from the processor to the board, and you will find it very difficult to use an HC05 with this robot. To do so you would need to solder wires to some very small pins on the processor.

Here's some more documentation on the robot and the pin mapping of the 32U4 processor used on the board.
https://www.pololu.com/product/2473
https://www.arduino.cc/en/Hacking/PinMapping32u4

Can you find another robot platform to use, or else remove the bluetooth communication from your project?

Are these the schools robots, and will they allow you to hack them?
Are they your robots and are you willing to ruin them?

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Hi,

unfortunatly they are school robots and whole project is based on bluetooth so I cant expent it.
What do you thing about solution, that I will connect anothor board (arduino Mega 2560) via I2C to the arduino robot, and I´m gonna send data first to that board and then from that board communicate with bluetooth module. I isn´t most effective solution, but it should teoreticaly work with my application when I want to sent my data at once.

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If the project calls for you to use those robots with Bluetooth, it seems like a reasonable plan. Do you have any other choices than the Mega? It appears quite large for mounting on the robot platform.

One additional possibility instead of the HC05's with Mega's is if you or the school has some ESP32' modules which have built in Bluetooth. If you were to use them, you would need level shifters on the i2c lines as the robot 32U4's are 5v devices and the ESP32 is a 3.3v device.

Good luck with your project.

5

Thank for help and ideas,

That robot is quite big so I thing I can fit mega somewhere. Second robot will have Arduino Uno R3, because I´ve got Mega somewhere for free and Uno is cheaper.

I have those robots borrowed from Czech University of defence (My school doesn´t have even Arduino UNO :slight_smile: ) and I don´t thing that they have this one. Rest I have to buy myself, so
I don´t have time or recources for that option, maybe as backup, but still thanks.

Kitfisto

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