I’m pretty new to Ardupilot, I’m trying to communicate with a pixhawk board with i2c, so I have a some questions.
I’m on a very early stage, actually I can see messages on the irlock address (0x54), at the moment I’d simply like to send a message back and read it on the console, doesn’t matter if infos are incorrect. Is there a better way to test the i2c messages?
After that, I how could I build the last version of ArduCopter with HIL?
Actually I need to read value on the i2c bus, pratically in the same way irlock do that (don’t know if there are other examples, I think yes, but I found the irlock implementation useful to me).
For testing purpose I’m using an i2c host adapter to read an write values like on a serial port, the next step would be to use an arduino as i2c slave.
What I’m trying to do is to write on address 0x54 and see a log (with hal.console) of reading on the pixhawk side.
I think you will have to explain a bit more
As far as I know the Pixhawk software only works as an I2C master, (though the hardware is there for it to be a slave, but the software is not implemented)
So you want to attach a slave device to the Pixhawk that answers on I2c address 0x54 and I am guessing looks like an IR_lock sensor?
I’m sorry that I was not clear, I will try to do my best
Anyway, you’re right: Pixhawk acts as master, and the slave device should answers on I2c address 0x54 like an irlock!
It sounds like a cool project. Maybe it would be easier to test it out on 2 Arduino first. It appears that the Arduino code supports slave mode.
Note that the Pixhawk I2C bus uses pullups to 3 volts, whereas some of the more common Arduino’s use 5V for the pullups ( and the supply voltage). You really need an Arduino that uses a 3 volt supply, ( There are 3v Arduino Pro Mini I believe that run at 8 MHz clock , not 16 MHz)
If you try to mix 3 and 5 volt I2C you will have a lot of problems in getting it to work reliably.
