![]() The block pushed can then complete a circuit that powers the inverter input block that shuts down the power rail on the unloading hopper. Once the empty mine cart detector is done, it's output can be used to push a block using a piston. You could then manually send it off with by depowering the activator rail and powering the powered rails at the end of the track, sending it back to collect and unlocking the hopper as it leaves its resting place. There, it could power an activator rail that locks the hopper and unpowers the powered rails, stopping the cart at far end (stopped and locked so that it doesn't needlessly lag the game). You can avoid the different path issue by putting the empty detector at the far end of the farm where cart is not unloaded. This should be doable with a combination of rails that make turns and mine cart inertia. You should also note that when the hopper cart goes harvesting the farm output, it leaves the unloading station using a different path that doesn't pass the detector rail, otherwise you'll be likely to get an empty signal from a freshly emptied cart. It doesn't work 'as is', but you will need to adjust the timings so that the signal doesn't escape to output when the mine cart has contents. I have drawn a rough schematic of this circuit. The back input needs to be weaker than the side input when side input is present to only give a signal when the mine cart is empty. The information from the two signals can then be combined using a redstone comparator, with the full/empty signal as a the side input and and presence of a mine cart as back input. You need to get two signals from the detector rail - one pulled using redstone dust or a repeater to confirm that there is indeed a minecart and another using a comparator to confirm whether it has contents. Mine carts and amount of their contents can be detected using a detector rail. Thus, the end goal of any system that wants to prevent the cart from leaving is to power that block. If the block is powered, the rail is shut down and the cart may not leave. What is important to notice here is that the block between the redstone repeater, comparator and torch is an inverter input. If the cart is unloading or your storage system is full (and thus items are stuck in the hopper), the cart is not sent back to the tracks. ![]() Once the unloading hopper is empty, the cart is free to go. So essentially, if there are items in the hopper, the cart is stopped. If there are items in the unloading hopper, the comparator gives a signal to the block at its output, turning off the redstone torch. The repeater now powers the block at its output, which in turn powers the powered rail next to it, on top of the unloading hopper. The Redstone torch powers the block above it, which in turn powers the repeater. This should power the powered rail on top of the hopper if there are no items inside the hopper. Now, place a redstone repeater on top of the block with the torch jutting from it, pointing towards the hopper and place a block above the comparator. ![]() Now, place a redstone torch on the side of the block the Redstone comparator is pointing towards and then place a block on top of it. Place a redstone comparator next to the hopper, pointing away from the hopper and have it point towards a block. This circuit is buildt on a side the hopper where it is not pointing towards. ![]() The hopper should point towards your collection system. This is a simple 8x2x1 block circuit:įirst, you have a hopper for unloading the minecart and a powered rail on top of that hopper. Let's start this with the unloader and let's not worry about the minecart arriving empty for now. ![]()
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