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Always-on circuit guide

# Always-on circuit guide

This circuit will check a device - in this example a [Wall Light](/wiki/wall-light) - and restart it, if it will shut down / deactivate for a reason.

<gallery>
AlwaysOnCircuit.jpg|Full Visual with Settings
</gallery>

![AlwaysOnCircuit.jpg](AlwaysOnCircuit.jpg)


## Trivia

- This little thing was invented by user **"Simoyd"** in discord-chat "logic-ciruit-discussion" and needed and created by user "Raumfahrtdoc"
- This is super useful to restart the [Kit (Gas Generator)](/wiki/kit-gas-generator) / [Gas Generator](/wiki/gas-generator)

## Improved version

![Improved Always-On-Circuit using only two I/O and two processing units.](Improved Always-On-Circuit.png)
- Improved Always-On-Circuit using only two I/O and two processing units.*

Using the new [Min/Max Unit](/wiki/kit-logic-processor#min2fmax-unit) as an OR gate and [Compare unit](/wiki/kit-logic-processor#compare-unit) as a (controlled) NOT gate, a much cheaper version is possible. Basically, it is a controlled clock that only runs when the device is off and otherwise stays at 1. The circuit can also be modified easily to make an always-off circuit (e.g. to auto-close doors), see table below.

| + Circuit setup |
|---|
| **Unit name || Unit type    || Connector / Setting || Source / Value** |
| reader |
|  |
| max |
|  |
|  |
| compare |
|  |
|  |
| writer |
|  |
|  |