A metering head for seeds less than one millimetre in diameter, but easily modified for larger seeds. Originally designed to "upgrade" the normal, hand pushed, two wheeled garden planter with belts or disks to handle fine seeds, it could mount on any existing planter where tiny seeds are traditionally distributed by air manifolds. In this case, a single unit would be used for each row. Software accommodates this greater use, and with an eye on the broadacre needs of licensed poppy growers, a logging facility is inbuilt.
The metering is done by a tiny screw auger controlled by a stepper motor, with feed rate determined by ground speed. Code is available at excelworks.info