Make Your Cactus Bionic With Bionic Cactus

The closest some of us at Hackaday get to a green thumb comes when we are painting, so for us and other folks not gifted in the gardening department Bionic Cactus might help. It’s a neatly designed water and light control system, built around an ESP8266. You can control the system through a web interface, setting a schedule for water and light and seeing how much water is left in the reservoir. There is also a soil moisture sensor and it will even email you when it is running low on water. As creator [SamsonKing] notes, if you combine this with a 3D-printed plant pot and light holder, and you’ve got a complete system from growing herbs and spices in the middle of winter.

[SamsonKing] created the system using PlatformIO, a neat open source Internet of Things development platform that means you could probably switch the system over to run on other low-power platforms if you had them lying around. But with an ESP8266 typically costing no more than a few bucks, it’s a neat and low-cost way to keep your plants fed and watered.

Automated gardening has featured many times here at Hackaday, just one of many is this indoor hydroponic lettuce factory.

Cyborg, Or Leafy Sensor Array?

Some plants react quickly enough for our senses to notice, such as a Venus flytrap or mimosa pudica. Most of the time, we need time-lapse photography at a minimum to notice while more exotic sensors can measure things like microscopic pores opening and closing. As with any sensor reading, those measurements can be turned into action through a little trick we call automation. [Harpreet Sareen] and [Pattie Maes] at MIT brought these two ideas together in a way which we haven’t seen before where a plant has taken the driver’s seat in a project called Elowan. Details are sparse but the concept is easy enough to grasp.

We are not sure if this qualifies as a full-fledged cyborg or if this is a case of a robot using biological sensors. Maybe it all depends on which angle you present this mixture of plant and machine. Perhaps it is truly is the symbiotic relationship that the project claims it to be. The robot would not receive any instructions without the plant and the plant would receive sub-optimal light without the robot. What other ways could plants be integrated into robotics to make it a bona fide cyborg?

Continue reading “Cyborg, Or Leafy Sensor Array?”

TerraDome Gives Plants And Dinosaurs A New Home

Housing exotic plants or animals offer a great opportunity to get into the world of electronic automation. When temperature, light, and humidity ranges are crucial, sensors are your best friend. And if woodworking and other types of crafts are your thing on top, why not build it all from scratch. [MagicManu] did so with his Jurassic Park themed octagonal dome built from MDF and transparent polystyrene.

With the intention to house some exotic plants of his own, [MagicManu] equipped the dome with an Arduino powered control system that regulates the temperature and light, and displays the current sensor states on a LCD, including the humidity. For reasons of simplicity regarding wiring and isolation, the humidity itself is not automated for the time being. A fan salvaged from an old PC power supply provides proper ventilation, and in case the temperature inside the dome ever gets too high, a servo controlled set of doors that match the Jurassic Park theme, will automatically open up.

[MagicManu] documented the whole build process in a video, which you can watch after the break — in French only though. We’ve seen a similar DIY indoor gardening project earlier this year, and considering its simple yet practical application to learn about sensors, plus a growing interest in indoor gardening itself (pun fully intended), this certainly won’t be the last one.
Continue reading “TerraDome Gives Plants And Dinosaurs A New Home”

Autonomous Agribots For Agriculture

For his Hackaday Prize entry, [TegwynTwmffat] is going all-in on autonomous robotics. No, it’s not a self-driving car with highly advanced features such as cruise control with lane-keeping. This is an autonomous robot that’s capable of driving itself. It’s a robot built for agriculture, and relative to other autonomous robotics projects, this one is huge. It’s the size of a small tractor.

The goal [Tegwyn]’s project is to build a robot capable of roving fields of crops to weed, harvest, and possibly fertilize the land. This is a superset of the autonomous car problem: not only does [Tegwyn] need to build a chassis to roll around a field, he needs accurate sensors, some sort of connection to the Internet, and a fast processor on board. The mechanical part of this build comes in the form of a rolling chassis that’s a bit bigger than a golf cart, and electrically powered (although there is a small Honda generator strapped to the back). The electronics is where this gets really interesting, with a rather large board built to house all the sensor and wireless modules, with everything controlled by a TC275, a multicore, 32-bit microcontroller that also has the world record for solving a Rubik’s cube.

Already, [Tegwyn] has a chassis and motor set up, and is already running some code to allow for autonomous navigation. It’s not much now — just rolling down a garden path — but then again, if you’re building a robot for agriculture, it’s not that hard to roll around an open field. You can check out a video of the bot in action below.

Continue reading “Autonomous Agribots For Agriculture”

Carrots In Space

For this year’s Hackaday Prize, [will.stevens] is growing his own produce and now looks for a way to shield his endeavors from the perils of the British winter. To achieve this, he decided to grow vegetables in sealed containers. Inspired by prior art and backed up by research, his approach is a wild mix of applied laziness on one hand and reckless over-engineering on the other. The sealed containers in this project are PET bottles, chosen for their availability and the produce are carrots, mainly because they can be harvested through the bottle’s mouth. Carrots also feature a high energy density and can provide fibers for plant-based construction materials so [will] deems them ideal space colonist food.

The project is currently in its fourth attempt and somewhere along the road from carrot seeds, dirt and some water in a soda bottle to the current state, the setup sprouted artificial lighting and a CO2 sensor. Fully aware that sealed greenhouses are a proven concept, [will.stevens] provides links to literature one should read before attempting something like this, alongside regular updates on his progress.

With a sensor and LEDs already in place, it is just a matter of time until a raspi will be added. Or we might see the demise of the soil in favor of a hydroponic setup.

Sensing Soil Moisture: You’re Doing it Wrong!

If you compulsively search online for inexpensive microcontroller add-ons, you will see soil moisture measurement kits. [aka] built a greenhouse with a host of hacked hardware including lights and automatic watering. What caught our attention among all these was Step 5 in their instructions where [aka] explains why the cheap soil sensing probes aren’t worth their weight in potting soil. Even worse, they may leave vacationers with a mistaken sense of security over their unattended plants.

The sensing stakes, which come with a small amplifier, work splendidly out of the box, but if you recall, passing current through electrodes via moisture is the recipe for electrolysis and that has a pretty profound effect on metal. [Aka] shows us the effects of electrolysis on these probes and mentions that damaged probes will cease to give useful information which could lead to overworked pumps and flooded helpless plants.

There is an easy solution. Graphite probes are inexpensive to make yourself. Simply harvest them from pencils or buy woodless pencils from the art store. Add some wires and hold them with shrink tube, and you have probes which won’t fail you or your plants.

Here’s some garden automation if this only whet your whistle, and here’s a robotic friend who takes care of the weeds for you.

Amalgamate is the Internet of Compost

A lot of people are scared of composting. After all, if the temperatures or humidity go badly wrong, you can end up with dried-out trash or a stinking soup. Getting the balance right is a secret known to the ancients: toss it in a big pile in your backyard. But what if you don’t have a big backyard?

Amalgamate is a composting setup for the urban dweller, or for people who just don’t like bugs. [Jamie] built it as her first Raspberry Pi project, and that makes it a great entrée into the world of things. But it’s no lightweight: the software measures temperature and humidity, and lets you schedule watering and rotating the compost. And of course, if you’re a micromanager, you can get up-to-the-minute vitals on your cellphone and tweak everything to run just perfectly. Continue reading “Amalgamate is the Internet of Compost”