I2C communication between Pixhawk and Arduino

Pixhawk
1

Hello,

I’m looking for a way to establish a serial I2C communication between a Pixhawk and an Arduino board.

The idea behind it is to connect one (and more) sensors to the Arduino, process the data and send (MAVLINK) messages to the Pixhawk.

Being a noob, does this make sense at all ? If so, where do I start :slight_smile:

Cheers,
Hans

2

I’m also trying to figure this out. I have an analog pitot tube, but there’s no analog port on the pixhawk mini.

I’d prefer to not buy anything new, so if I can figure out how to use an Arduino to emulate the i2c sensor, that would be awesome

3

After reading the dev.px4.io pages during the last days, I’ve skipped the plan the use an Arduino. Actually I’m going to have to write a device driver (Looks like I’ll have to dive up my C++ OOP courses again :grin:) for the sensor and connect it to the I2C port of the PixHawk.

Can someone explain me how to get access to the PX4 console (not NSH) of a PixHawk mini ? Unfortunately there is no information about this on dev.px4.io.

Cheers,
Hans

4

The simplest way is to emulate the sensor as @m.perreman. To do so, you’ve to mimic existing I2C sensor for the same data.

The other way is to create a new driver for your device which means you have to:

  • Use your sensor on the arduino
  • Define data transmission protocol
  • Read the sensor from PX4
  • Publish your data in the correct format in uOrb

Finally, you could instead go for a serial communication where you should just send the correct MAVLink message and maintain a 2Hz heartbeat.