Researchers at the RIKEN Cluster for Pioneering Research (CPR) say they have engineered a system for creating remote controlled “cyborg” cockroaches, equipped with a tiny wireless control module that is powered by a rechargeable battery attached to a solar cell. The use of ultrathin electronics and flexible materials allow the insects to still move freely.
Such cyborg insects – part insect, part machine – could prove useful for helping to inspect hazardous areas or monitor the environment, say the researchers. However, for the use of cyborg insects to be practical, handlers must be able to control them remotely for long periods of time, which requires wireless control of their leg segments, powered by a tiny rechargeable battery.
Keeping the battery adequately charged is fundamental – nobody wants a suddenly out-of-control team of cyborg cockroaches roaming around, say the researchers. While it’s possible to build docking stations for recharging the battery, the need to return and recharge could disrupt time-sensitive missions.
Therefore, say the researchers, the best solution is to include an on-board solar cell that can continuously ensure that the battery stays charged. To successfully integrate these devices into a cockroach that has limited surface area required the researchers to develop a special backpack, ultrathin organic solar cell modules, and an adhesion system that keeps the machinery attached for long periods of time while also allowing natural movements.
The researchers experimented with Madagascar cockroaches, which are approximately 6 cm long. They attached the wireless leg-control module and lithium polymer battery to the top of the insect on the thorax using a specially designed backpack, which was modeled after the body of a model cockroach. The backpack was 3D printed with an elastic polymer and conformed perfectly to the curved surface of the cockroach, allowing the rigid electronic device to be stably mounted on the thorax for more than a month.
The ultrathin 0.004-mm-thick organic solar cell module was mounted on the dorsal side of the abdomen. The body-mounted ultrathin organic solar cell module achieves a power output of 17.2 mW, which is more than 50 times larger than the power output of current state-of-the art energy harvesting devices on living insects, say the researchers.
The ultrathin and flexible organic solar cell, and how it was attached to the insect, proved necessary to ensure freedom of movement. After carefully examining natural cockroach movements, the researchers say they realized that the abdomen changes shape and portions of the exoskeleton overlap. To accommodate this, they interleaved adhesive and non-adhesive sections onto the films, which allowed them to bend but also stay attached.
When thicker solar cell films were tested, or when the films were uniformly attached, the cockroaches took twice as long to run the same distance, and had difficulty righting themselves when on their backs. Once these components were integrated into the cockroaches, along with wires that stimulate the leg segments, the new cyborgs were tested. The battery was charged with pseudo-sunlight for 30 minutes, and the insects were made to turn left and right using the wireless remote control.
“Considering the deformation of the thorax and abdomen during basic locomotion, a hybrid electronic system of rigid and flexible elements in the thorax and ultrasoft devices in the abdomen appears to be an effective design for cyborg cockroaches,” says Kenjiro Fukuda, RIKEN CPR. “Moreover, since abdominal deformation is not unique to cockroaches, our strategy can be adapted to other insects like beetles, or perhaps even flying insects like cicadas in the future.”