When you buy a Tello EDU you have 4 mission pads, which enable the drone to fly special assignments. To fly a mission there are special command available. Look at the Mission Pad User Guide. Available at :https://dl-cdn.ryzerobotics.com/downloads/Tello/Tello%20Mission%20Pad%20User%20Guide.pdf .
However flying a mission was more complicated. I had 3 problems:
1. the mission pad numbers
2. set up a mission from the command line
3. X and Y coordinates
First problem: pad numbers MID mission pad ID
It seems the pads have numbers, but I could not find where that number was. How can you find out?
Go to github: https://github.com/dbaldwin/DroneBlocks-DJITelloPy-Tutorial . Here you find a bonus script : bonus_01_get_tello_state.py.
If you run that script and tello is on a pad it will give you the mid.
Here is the output when Tello flying over MID 1:
'agx': -6.0,
'agy': 10.0,
'agz': -999.0,
'baro': 112.27,
'bat': 61,
'h': 70,
'mid': 1,
'mpry': '2,-4,178',
'pitch': 0,
'roll': 0,
'temph': 47,
'templ': 44,
'time': 12,
'tof': 83,
'vgx': 0,
'vgy': 0,
'vgz': 0,
'x': -10,
'y': 3,
'yaw': -1,
'z': 84}
Do that for all 4 pads front and backside and write the number on the pad.
Just discovered that the number is on the pad: printed as white line between the stars! If you look closely it is a number. Here is for example pad 3:
Second: how to set up a mission with 4 pads.
The mission pad works as a switch; like if…. Then. Read the guide closely.
Set up the following:
M1 M2 M3 M4 are the MIDs
The arrow is the direction, represented by the direction of the rocket on the pad. ( I come back to this later)
Next we need a command line to send instruction to the Tello.
Go to https://tello.oneoffcoder.com/python-manual-control.html . Under section 8 you find the scripts to send commands to the Tello.
For example:
python3 app.py -f command4.txt
In this case the commands in the txt file command4 are send to the drone.
And here are the commands for command4 forcing the Tello to fly a square over the pads.
(Important to understand is that you have to state the x,y,z coordinates of each MID)
command
takeoff
battery?
mon
mdirection 0
jump 0 80 60 60 90 m1 m2
#(tello is on m1 flies to 0 80 60, speed 60, if m2 is recognized camera is turned 90 degrees)
delay1
jump 0 80 60 60 90 m2 m3
delay 1
jump 0 80 60 60 90 m3 m4
delay 1
jump 0 80 60 60 90 m4 m1
delay 1
land
And the result is this video:
Problem 3: X and Y
The coordinates are looking peculiar; I just discovered them by trial and error. But when I changed the direction of the pads(direction of the rocket) it did not work anymore. I needed new coordinates.
So the coordinates (x,y; that is the first two) are relatives to direction. The rocket gives the direction of the X axis.
Here are two figures showing the relations ship between direction and coordinates.
Figure 2 shows the position of the Tello: using the the same x and y while turning the direction of the pad.
