The BRD PP-APU

(piggy power or player proximity- automated power unit)

This device has a little bit going on. It works using the game behaviors of the animals moving when a player approaches. I haven't actually counted the range of this but in the distance- just as the animals begin to move on your screen is when this becomes active and will remain running as long as a player is within the range described...running the farms connected to it. Pretty much as soon as someone ports to the island it is all active.

A skulk sensor detects the hooves of the pigs on the glass floor (this combo seems to work well) and outputs a redstone signal that is repeated into an array of large pulse extenders that work as capacitors with a slow release time... perhaps a deep cycle battery? NOT comparing redstone to electricity tho...
These extenders hold the redstone signal for a long time each with the intention of having enough stored signal to be continuous at the end of the array so as to not be interrupted while waiting for an update from the skulk sensor to re-establish the signal at the start- thereby recharging the "capacitance". At the end of this array is a simple on/off setup to engage 3 different timers that run continuously as long as the APU is running and also has a replenishment command block for the block feed to the de-spawn timer. 2 are hopper timers with a piston redstone block and 1 is a dropper to pressure plate timer.

Looking at the APU: The front is the side with the animal holding. The redstone lamps on the walls of the unit are the outputs. The top lamp is on/off and the bottom is pulse and each set is identified by colour. One can repeat these signals using a few means. We use an observer on the 5 min on/off for our flying machine farm on our spawn build as an example but it's likely more useful on larger farms.

The front/orange is 1 min, back/yellow is 2 min, right/red is 5 min and the left/green has 2 side-by-side constant power on.

Access is given for maint in the event of worldedit paste issues.

Pasting info:
The build is 11 wide, 7 deep, 12 high. You are facing west standing at the left corner, face against the front wall.

0 mods required

Remember to paste redstone asynchronously using methods like Carpet or Fastasynchworldedit. Pasting in tick time presents immediate block updates upon paste among other anomalies that break redstone builds.

This build is incorporated in a world download with more content located here: www.planetminecraft.com/project/spawn-build-5443036/