Updates
Target Location:
The target will output a chirp or ping from an ultrasonic transmitter. The tanks will continuously search for an ultrasonic signal. This allows not only location, but a distance from the object as well. Using a chirp instead of a constant ultrasonic output greatly reduced the chances of a standing wave forming. This standing wave would produce inaccurate readings and throw off the recievers.
Communication:
The three tanks will communicate via Bluetooth using what is known as a piconet. There will be one master and two slaves. All tanks will append their location into a text file, and share between the group. the receiving parties will then read the text files for the appropriate information.
Object Avoidance:
I plan to use 4 digital sensors for object avoidance instead of analog. this prevents complications with A-D conversions given the Dragonboard has only digital GPIOs.