How can you build an automatic sugar cane farm in minecraft pocket edition?

How can you build an automatic sugar cane farm in minecraft pocket edition?

I recommend you to watch larslp bedrock guide 2 how to build a sugar cane farm.

Redstoneclock and in the 2nd row a piston that extends again and again

Ok, thank you, and how do you build that with the funnels that the items come in a box because I'm not familiar with funnels, because that never works for me

Put the box to the side and pull the funnel to the chest while you sneak. However, funnels do NOT collect through blocks, so do not put them under the sand, but next to it