The Drone will harvest any fully grown crop or tree within the specified area/$. Items that are dropped from the crop blocks are not/$ picked up; either add a separate Pick Up Item/$ widget, or use some alternate means of collecting the items, such as a separate Drone/$.
You can connect an optional Item Filter/$ to limit which crops will be harvested (use the crop's seed to filter).
Tools
You can make the Drone/$ import/$ a Hoe/$. When equipped with a Hoe, crops will automatically be replanted (this uses durability from the Hoe).
You can force the Drone/$ to only/$ harvest when carrying a Hoe by checking the Requires Hoe/$ checkbox in the widget setup GUI; then, if/when the Hoe breaks, the drone can get another one before continuing to harvest.
Limiting Blocks Harvested
The amount of harvest actions can be limited to a specified amount by right-clicking/$ the Harvest/$ widget.
If set to 1 for example, the Drone/$ will only harvest one block each time the widget is executed, and move on to the next widget after harvesting that one block.
Get off my land/$