How to Manage 2 differents or more CityHub in Pybricks

[didiersm]

I have spent a lot of hours on this subject without found a solution.
In fact is it possible?
Tks

[laurensvalk]

Sure. But can you elaborate on what you would like to do?

You could make them communicate with the broadcast functionality.

If you mean programming them at the same time, you can simply open pybricks in another browser window.

[dlech]

You either need to change this line in #train1

train1.ble.broadcast(str(color))

to

train1.ble.broadcast([str(color)])

or change these lines in #tramway

            rx_color = data[0]

            if str(color) == rx_color:
                return  

to

             if str(color) == data:
                return  

[BertLindeman]

Loose from the solid advice from David.

Just a naive glance at the code....

In your tramway code the wait(100) as it is now:

def check_for_color(color):
    while True:
        # Receive broadcast from the other hub.

        data = tramwayHub.ble.observe(1)

        if data is None:
            tramwayHub.light.on(Color.RED)
        else:
            tramwayHub.light.on(Color.BLUE)
            rx_color = data[0]

            if str(color) == rx_color:
                return      
    wait(100)

Should maybe be indented 4 bytes extra? So it is within the whilw True.

Bert

[didiersm]

Thanks to all of you its' works and thanks to the embeded code ;)

[didiersm]

I need still help
The motor goes on but never stop with a red brick!
Tks

from pybricks.hubs import CityHub
from pybricks.pupdevices import DCMotor, Light, ColorDistanceSensor
from pybricks.parameters import Button, Color, Direction, Port, Stop
from pybricks.tools import wait, StopWatch

trainhub = CityHub(broadcast_channel=1, observe_channels=[2,3])
trainmotor = DCMotor(Port.A)
trainsensor = ColorDistanceSensor(Port.B)


def check_for_color(color):
    #print("Program Started")
    pass
while True:
    color = trainsensor.color()
    trainhub.ble.broadcast([str(color)])
    # broadcasts are sent every 100ms so no reason to update faster
    wait(100)

    while trainsensor.color() !="RED":
        trainmotor.dc(50)
    print("RED")
    check_for_color(Color.NONE)

[laurensvalk]

To debug something like this, it can help to print what the sensor measures:

print(trainsensor.color())

You'll find that instead of "RED", you can use use Color.RED.

See also this example: https://docs.pybricks.com/en/latest/pupdevices/colordistancesensor.html#waiting-for-a-color

We also have a brand new block coding interface that may help. Just scroll upwards on the page linked above to see what all the blocks look like for the color sensor.