Done plenty of herding with and without a siren attached to p4. counting is a different story but is possible- one company I came across was using microscope cell counting software adapted to count sheep.
i flew a mission with it, it took a minute for me to get it going as i had used dronedeploy and it was automatic from pushing take off, the dji app took off and hovered just off the ground and didnt start untill i manually climbed to altitude. it worked well tho.
i was going to buy a p4 power clip as i like the concept alot, it does the same but without opening the bird, unfortunately it cost more than a new p4 battery from amazon.
flying in s mode in heavy ish wind today and had a 'return to home battery critically low' message come up, still had 30% so backed off the throttle a tad and bought it back, i guess it was voltage sag from fighting the headwind for so long.
you need a 'light dark resistor' taped to the front light under the phantom, then in the go app configure the c button to turn the light on and off. i use one of these with a battery to activate stuff on my p4
DC 12V Dual Wire Actuation Type Photoswitch Sensor Relay Module
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