blaze.jasper.io
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Australia
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Hi Guys
I have been mucking around for a few weeks now trying to put an aftermarket parachute onto my Octo-copter using the DJI A2. the parachute I am using is a spring loaded canister with a servo pulling a pin to release the parachute. what I have discovered is;
1. the A2 Parachute function will not work with any parachute other than the DJI dropsafe. I have tried pluging my parachute, triggers and switches into the X3 and F4 ports and do not receive any signals from theses ports. also in the A2 Assistance software it says no parachute detected and basically the system wont work.
2. my second method was cut the power to the A2 FC by placing a 10amp switch on the PMU which would hopefully cut the motors. this turned out to be more of a Drama then I anticipated because the FC will still receive power from the ESC's, IOSD and the Futaba Receiver. So to get around this you have to wire the IOSD onto the switch (same one as the FC) and then pull the Positive (red) pins on all the ESC signal wire and on the Futaba receiver wire and then power the Futaba receiver via a separate power source (i.e BEC). now this method actually works, however there is a reasonably large delay in-between when the switch is flicked and the ESC's decided to stop the motors. In testing I had the 10amp switch and the parachute plugged directly into my receiver (channel 5 and channel 6) and I used one switch on the Futaba 14SG to trigger both but with a time delay on the parachute so it would not eject when the motors are still running.. As I said it works but the time delay is large (about 5 seconds) and there is no telling what your copter will do in the air while it waits for the ESC's to cut off the motors and for the parachute to deploy.
3.
Best Method: the 3rd thing I tried turned out to be the easiest.. Now the DJI A2 dose not have immediate motor cut-off, meaning when you put your throttle stick to the lowest point the engines will not stop, they will idle. to turn of the A2 motors you need to push both sticks down and across as most of you will know and this will instantly cut the motors. however this is a bit of a drama to do while flying and trigger the parachute at the same time. SO. using the Futaba 14SG (im sure the other controllers have a similar function) go to the "program Mix" function (PROG. MIX in the model menu) and via a ON/OFF switch you can program the throttle to go to +100, yaw to +100, elevator to +100 and aileron to -100 which is the essentially the same as turning motors off via the sticks however this will do it almost instantly via one ON/OFF switch. once this works all you need to do is plug the Parachute into a spare channel of your receiver and program it to the same switch as the Motors ON/OFF switch you have just created. if you need to put a 1 or 2 second time delay in the parachute just go to the Servo Speed Function (in the linkage menu) and increase the numbers on whichever channel you have the parachute plugged into and it will create a delay in the trigger.
this method will work with any aftermarket parachute |
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