[Jethro Tull] is a name you may well associate with a 1970s prog/folk rock band featuring a flautist, but the original [Tull] was an inventor whose work you benefit from every day. He was a British lawyer and landowner who lived over the turn of the 18th century, and who invented among other things the mechanical seed drill.
Were [Tull] alive today he would no doubt be impressed by the work of [Akash Heimlich], who has created an exquisite vacuum seed placer for his rooftop hydroponic lettuce farm. Unlike the continuous rows of seed on the Berkshire earth of [Tull]’s farm, the lettuce seed must be placed in an even grid on a foam substrate for the hydroponic equivalent. This was an extremely tedious task when done by hand, so [Akash] set about automating the process with a vacuum seeder that is a thing of beauty.
It uses a simple yet effective mechanism involving a row of pipettes connected to a vacuum line, that are rotated over a vibrating hopper of seeds from which each one collects a single seed, before being rotated back over the foam where the seeds are dropped in a neat row through 3D-printed funnels. The foam is advanced, and the process is repeated until there is a neat grid of seeds. In only four minutes it can deliver 150 seeds, reducing several hours work into under half an hour.
The whole machine is controlled by an Arduino, with a couple of stepper motors to move foam and pipettes alongside the vibrator motor. You can see its operation in the video below the break.
We’ve covered a huge number of hydroponic projects in our time, though as far as we can see this is our first seeder. Most recently we’ve shown you a couple of vertical hydroponic systems using PVC pipe, one for growing plants as pollution biomarkers, and another back-garden system that is solar-powered.
Well , why not use an automated hand seeder , costs a few bucks from aliexpress.
http://gardenmania.com.br/product_images/a/131/DSC05582__58070_zoom.JPG
you could save on the vacuum and build a 3 axis planter , would be a lot faster and you could programm paterns.
Do you have a link or at least keyword(s) to search for one of these?
Oh, and it looks to me like the machine in the video doesn’t do a very good. Lots of empty spaces and doubled up seeds.
Except that it is a bit cost prohibitive, a pick & place type machine could do the same in a few seconds.
Sure, it’s not perfect, but it’s a clever effort. I like it.
Cool project! But the plywood sheet with grid drilled holes- do the job waaay faster.
sure would beat hand seeding good work
Nothing new here… Planting machines using vacuum (vacuum planters, seeders) have been around a long time.