Have you ever tired of playing with your latest robot invention and wished you could just eat it? Well, that’s exactly what a team of researchers is investigating. There is a fully funded research initiative (not an April Fools’ joke, as far as we know) delving into the possibilities of edible electronics and mechanical systems used in robotics. The team, led by EPFL in Switzerland, combines food process engineering, printed and molecular electronics, and soft robotics to create fully functional and practical robots that can be consumed at the end of
their lifespan. While the concept of food-based robots may seem unusual, the potential applications in medicine and reducing waste during food delivery are significant driving factors behind this idea.
The Robofood project (some articles are paywalled!) has clearly made some inroads into the many components needed. Take, for example, batteries. Normally, ingesting a battery would result in a trip to the emergency room, but an edible battery can be made from an anode of riboflavin (found in almonds and egg whites) and a cathode of quercetin, as we covered a while ago. The team proposed another battery using 
activated charcoal (AC) electrodes on a gelatin substrate. Water is split into its constituent oxygen and hydrogen by applying a voltage to the structure. These gasses adsorb into the AC surface and later recombine back into the water, providing a usable one-volt output for ten minutes with a similar charge time. This simple structure is reusable and, once expired, dissolves harmlessly in (simulated) gastric fluid in twenty minutes. Such a device could potentially power a GI-tract exploratory robot or other sensor devices.
But what use is power without control? (as some car tyre advert once said) Microfluidic control circuits can be created using a stack of edible materials, primarily oleogels, like ethyl cellulose, mixed with an organic oil such as olive oil. A microfluidic NOT gate combines a pressure-controlled switch with a fluid resistor as the ‘pull-up’. The switch has a horizontal flow channel with a blockage that is cleared when a control pressure is applied. As every electronic engineer knows, once you have a controlled switch and a resistor, you can build NOT gates and all the other logic functions, flip-flops, and memories. Although they are very slow, the control components are importantly edible.
Edible electronics don’t feature here often, but we did dig up this simple edible chocolate bunny that screams when you bite it. Who wouldn’t want one of those?
When Skynet becomes sentient, your vegetables will eat you!
“The Thing”? “The Day of the Triffids”?
As a science fiction fan, stories like this verge between “Huh! They’re really doing it!” and “So what else is new?” 😊
Sings,
“A-ttaaack of the Killer Tomatoes!”
Well look on the bright side, we can defeat the robot uprising with nothing more than a bottle of ketchup.
We finally figured out how we evolved.
The chocolate bunny will bite back!
Lettuce be glad someone is doing this.
Why do all robots taste like chicken?
Tired with my robot.
Tired with my Robot.
Tired WITH my robot.
…
Tired OF my robot?
Are the robot and I both tired of something together?
There are always people who simply dismiss these complaints with an eye-rolling “everyone understands it so who cares?”
But that’s just it.
Sometimes we don’t.
I stopped and stared at that title for an unreasonably long time before realizing what was actually going on.
Once again.
Proofreading.
we have found the grammar nazi
<>
It’s actually accurate, you just aren’t familiar with the usage.
Aye, we’re both tired together… The years have been long
“Kosher robot, say hi to Halal robot.”
This is what happens when hire vegan researchers.
Robot OS has to watch its shelf-life and dispose of itself before the do-not-eat-date.
But the Fourth robot law of avoiding harm to itself will prevent it from jumping into the pan.
“I am hungry. Make like a dinner and be the ratatouille!”
“I am sorry, Dave, but I can’t let you do that.”
yawn
Now if it were a meat robot that could crawl
out of the fridge and onto the barbeque, now that would be progress!