AVT 1916 Quick Start Manual

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Configurable 4-Channel Switch

kits

A configurable 4-channel switch circuit, allowing the

attached devices to be controlled in any way. Each

output can operate in monostable, bistable and

dependent modes, and due to the synchronisation

output and input, it is possible to link multiple such

switches together.

Circuit description

Schematic diagram of the switch is shown in Figure 1.

It must be supplied with 12VDC. Operation of the

switch is controlled by an Atmega8 microcontroller.

The ULN2003A circuit is used to power relays.

LED1...LED4 indicate which relay is energised. Relays

are switched using the S1...S4 buttons.

The "MODE" jumper is used to select the operation

mode, while the way of switching on a particular

relay is made using jumpers 1...4, switching them to

the "B" position - bistable operation or "M" -

monostable

operation.

The "MODE" jumper set in "SW" mode configures

the device to operate in the switch mode with the

possibility of setting any channel as a monostable

switch ( jumper in "M" position - relay

is switched on as long as the button is held down) or

Specifications

• 3 operating modes: monostable, bistable and

dependent

• multiple such switches can be connected together

• independent configuration of each of the four outputs

• output circuit: 4 relays 230 VAC / 10 A (NC/NO)

• supply: 12 VDC

• board size: 68×75 mm

bistable ( jumper in "B" position - each time the

button is pressed, the relay changes to the opposite

state). In the next mode, the switch can operate as a

dependent. To activate this function, switch the

"MODE" jumper to the "SEL" position. In this mode,

the 'S' sync input is activated and there is a low level

on this line every time a button is pressed. This

causes all relays to switch off and only the currently

selected relay to switch on. In addition, it is possible

to deactivate dependent operation for a channel in

this mode. It is then necessary to move the selected

jumper to the "B" position - from then on, each press

of the button will change the state of the assigned

relay to the opposite without affecting the other

channels, which will continue to operate in a

dependent manner.

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