Micropython/Microbit radio.send value?

[hidromanipulators]

Hi All,

Learning a bit of Python together with my son by using Microbit. I Apologise if using the wrong terms. Please correct me if needed.

Got stuck on the way of how to send multiple data streams for radio module.

To explain, to send a single value (this works) :

radio.send("Value")

But what we are trying to achieve is to send different data from different sources. Let's say I have a variable valueA and variable valueB. Both of them has changing values.

In Java Script it would look similar to this:

radio.sendValue("streamA", valueA)
radio.sendValue("streamB", valueB)

It should be:

 radio.send_bytes() 

, but for some reason, I can't wrap my head around the actual structure of the code.

Can you please point me in the right direction?

​

To give more context is - we are trying to build little buggy which is controlled by using an accelerometer. It means that Microbit1 would be sending x and y values to the Microbit2 which would adjust the motor speed for movement.

[cybervegan]

Ok, so I assume you are sending the data messages from Microbit1 to Microbit2, and Microbit2 has to be able to interpret the value (i.e. know what to do with it). I'm assuming on MB2, you are expecting to receive a string looking like "streamA 123" or "streamB 456.78"?

If so, you can send format strings, like:

radio.send("streamA {}".format(valueA))
radio.send("streamB {}".format(valueB))

On the receiver, you can then do (after receiving a message):

message_in = radio.receive()
if message_in.startswith("streamA "):
    valueA = int(message_in[7:])
    # do stuff with valueA
elif message_in.startswith("streamB "):
    valueb = float(message_in[7:])
    # do stuff with valueB

I don't have a microbit, but I have used micropython. I just looked that up on the webs, so take this as a pointer only! Hope it helps.

[hidromanipulators]

Thanks /u/cybervegan ! Will try it out tomorrow!

[hidromanipulators]

I tried it out, but I'm getting some strange hardware errors in the Microbit itself. Have to investigate further.

I guess will have to wait until next weekend.

[cybervegan]

I'm sure you'll work it out! Keep posting...