A new mobile autonomous robot could perform daily monitoring tasks while safely interacting with chickens in commercial chicken houses, according to researchers at the Georgia Tech Research Institute (GTRI). This advance could help farmers reduce the likelihood of disease outbreaks, lessen their labor costs, and allow them the freedom to take on more important tasks.
“Today’s challenge is to teach a robot how to move in environments that have dynamic, unpredictable obstacles, such as chickens,” said Colin Usher, a research scientist in GTRI’s Food Processing Technology Division. “When busy farmers must spend time in chicken houses, they are losing money and opportunities elsewhere on the farm. In addition, there is a labor shortage when it comes to finding workers to carry out manual tasks such as picking up floor eggs and simply monitoring the flocks. If a robot could successfully operate autonomously in a chicken house 24 hours a day and seven days a week, it could then pick up floor eggs, monitor machinery, and check on birds, among other things. By assigning one robot to each chicken house, we could also greatly reduce the potential for introductions of disease or cross-contamination from one house to other houses.”
The autonomous robot is outfitted with an ultrasonic localization system similar to GPS but more suited to an indoor environment where GPS might not be available. This system uses low-cost, ultrasonic beacons indicating the robot’s orientation and its location in a chicken house. The robot also carries a commercially available time-of-flight camera, which provides three-dimensional (3D) depth data by emitting light signals and then measuring how long they take to return. The localization and 3D data together allow the robot’s software to devise navigation plans around chickens to perform tasks.
“We are incorporating the chicken behavior into the robot’s planning and navigation algorithms,” said Usher. “If you’re a robot driving toward your goal – to monitor a machine, for instance – the chickens will get out of your way. The vast majority of the time, the birds create a ‘halo’ around a robot, allowing it to move unimpeded throughout the house. But if a stubborn chicken doesn’t move, the robot stops and waits. If the chicken refuses to make room, the robot will use its bumper to gently nudge the chicken and then back up to see if the animal has moved. In our lab testing, the chicken moved out of the way one hundred percent of the time after being nudged. The robot is programmed to attempt to nudge the chicken two times. If the chicken still hasn’t moved after the second nudge, the robot will generate a dynamic plan and drive around it.”
The research team, working closely with researchers at the University of Georgia, is preparing for a six-week field test in a small-scale grow-out house where the robot will interact with broiler chickens raised from chicks to maturity.
“This field test would allow us to test our current navigation algorithms, see how robust they are, and improve them,” he said.
Later, the robot will enter a multi-month field trial so testers can learn how well it picks up floor eggs in a commercial size grow-out facility housing full-grown breeder birds. The robot will “wake up” periodically and navigate through the house searching for eggs. Its software uses deep learning to find and locate eggs and chickens and uses visual servoing – similar to a person’s hand-eye coordination – to control a robotic arm’s movement.
In a real-time control loop, the computer receives successive images from a camera located on the end of the robotic arm aimed at the egg, guiding the arm closer and closer to the egg. The robot’s arm has a vacuum tip with a suction cup sensor that delicately picks up the egg and moves it to a basket. When the basket is full of eggs, the robot returns to a drop-off spot in the house, removes the eggs from the basket, and continues searching the house for more eggs to pick up.
In addition to carrying out physical tasks, deploying autonomous robots could potentially decrease the chances of a chicken house being exposed to avian flu or other diseases and contaminants carried inadvertently by people.
“If one house is sick and a worker goes from this house into a second one, the worker could have just spread the disease,” Usher stated. “If you have 20,000 breeder chickens, those birds live for a year laying eggs, but if they get sick after only two months, that’s a huge financial loss. The industry is very concerned about disease and cross-contamination, but we are developing a novel capability that could provide a solution, or at the very least mitigate a significant portion of the risk.”
By John Tibbetts
*Source: Georgia Tech Research Institute