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dji-sdk / Tello-Python

This is a collection of python modules that interact with the Ryze Tello drone.
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Tello SDK cannot go move after take off #19

Open yeohkc1995 opened 5 years ago

yeohkc1995 commented 5 years ago

Hi, the I am using this sdk for my newly bought tello. The video feed is fine, the take off and landing command works, and the rotate cw and ccw command works "Response: ok". However, when I send the any other commands (forward, backward, left, right etc) the command always return a "Response: Out of Range", and consequently my Tello can only take off, rotate on the spot, and land....

But it shouldn't be a connection issue, as it can recognize the rotate, take off and landing perfectly.

And the drone works perfectly well on my tello app in all aspects (if this info helps)

A example of the command from the tello.py file that does not work is this

def move_backward(self, distance):
    """Moves backward for a distance.

    See comments for Tello.move().

    Args:
        distance (int): Distance to move.

    Returns:
        str: Response from Tello, 'OK' or 'FALSE'.

    """

    return self.move('back', distance)

I didnt change the code, so it is as it originally was.

Anyone has any idea whats the issue :( its been bugging me. Any help will be appreciated!

sgolodetz commented 5 years ago

I'm exploring the possibility that the distance it's trying to move by default is too small (my Tello's just run out of battery, so more on this when it's recharged :)). If you look at this line in tello_control_ui.py, it's trying to move 10cm by default:

self.distance = 0.1  # default distance for 'move' cmd

However, if you look at the Tello SDK documentation, the smallest distance you can ask it to move is 20cm:

https://dl-cdn.ryzerobotics.com/downloads/tello/20180910/Tello%20SDK%20Documentation%20EN_1.3.pdf

I suspect that if you change it from 0.1 to 0.2, it will work - but I can't try that till my battery's charged :)

sgolodetz commented 5 years ago

Yup, that works, for the record. Although the UI did later crash on me, for what I suspect are unrelated reasons.

yeohkc1995 commented 5 years ago

Hi all thanks so much for the help. I have not logged in in while. Allow me a few days to check it out (am busy with work now). really hope it works... I will get back to this asap. Thanks yall so much, appreciate it!! :)