Digital inputs

The Edge Controller has 8 digital inputs. These can be used for sensing things like doors, mains power and tamper sensors.

Pinout

Pin	Function	Specification
1 (closest to outputs)	Ground	System ground, non isolated
2	12VDC	Shared between all 8 outputs, limited to approximately 0.8A.
3 (closest to USB)	Digital Input	8V-17V, current draw negligible (<150uA) at 12V

The outputs are short circuit protected. If they are shorted the 12V bus will be disable and it is necessary to toggle power or restart the Edge Controller to reset it. It is possible to monitor the status of the power bus from the UI.

It is not necessary to take power from the same output it is being returned to. You could have 3 door sensors all wired to separate inputs sharing a single power output.

Resetting after short circuit

If the 12V output from any of the input connectors is shorted to ground, or too much current is pulled (more than 1A), the system will go into fault mode and the outputs will be disabled.

To reenable them it is necessary to reset the fuse. Resetting the fuse will have no effect when the power is already OK.

Proximity sensor wiring

A PNP proximity sensor can easily be connected as per the below diagram. An NPN sensor will require a pullup resistor as the Edge Controller inputs are naturally pulled low.

Switch wiring

A normal switch can be wired as per the below diagram.

We recommend connecting it so as the input is 'normally closed' - ie. voltage should be present on the input pin when the switch is in it's normal position. This means that if a criminal cuts the wire, it is equivelent to the switch being opened.

Battery charger sense wire

Definition

The inputs are internally aliased to inputs 1-8.

For instance, to configure door sensor to use input channel 1 on the PCB

'door_sensor' => [
    'enabled' => true,
    'input_id' => 1, // this is input channel 1
    'inverted' => true, // treat input 'high' as normal state
],

To configure mains power sensing on channel 5

'mains_power' => [
    'enabled' => true,
    'input_id' => 5, // monitor channel 5
    'inverted' => true, // treat input 'high' as normal state
    ],

There are a couple of other flags that can be used on outputs:

Output Inversion

'inverted' => true,

This flips the logic so 'off' is electrically treated as 'on' and vice versa.