Levers, buttons and lights

A chip that only measures is deaf. By the time you get to the hallway light you want a say yourself. That is what levers, switches and buttons are for. They need no power and only hang on the data network.

Levers and switches: Open#

Lever (StructureLogicSwitch) and switch (StructureLogicSwitch2) report their position in Open: 1 means flipped, 0 means not flipped.

l r0 d0 Open       # lever flipped?
s d1 On r0         # light follows the lever

If you need the opposite, such as an emergency light that is on as long as the lever is not flipped, compute 1 − Open:

sub r1 1 r0        # 1 becomes 0, 0 becomes 1
s d2 On r1

Lights: On#

Wall light (StructureWallLight), flashing light (StructureFlashingLight) and the round lights are switched with On. Whether they really get power is told by Power: 1 means supplied. A light with On = 1 and Power = 0 stays dark.

Buttons: Activate#

The button (StructureLogicButton) works differently. When you press it, Activate jumps to 1 – but only for a little over half a second, then the value drops back to 0 on its own. While it is still 1, the button cannot be pressed again.

l r2 d3 Activate   # 1 only at the moment someone presses

What you can build now#

With lever, light and the math instructions you can already build small circuits: light on, emergency light off, display at 1. Every program still runs only once. If you flip the lever after the chip is done, nothing happens – that changes in week 3.