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Bus Relay

The IO Port Bus Relay Output plugin provides 8 power relay outputs fed from a common supply bus. In addition to the switched live connections, the common supply bus has seperate connections for neutral and earth, making it suitable for use with mains power (if suitable relays are used).

Description [size] Format
Circuit schematic [14.5KB] Adobe Acrobat PDF
PCB layout [99.6KB] Adobe Acrobat PDF

Note that the total current supplied through all the switched outputs at any time should not exceed 5A. The common supply input should be protected by a 5A fuse.

Interface

The plugin is designed to interface with the IO Port lettuce plugin board via one of its IO port connectors.

Outputs

Output connections are made via screw-terminals as labeled on the board.

Component list

Below is a full list of components required to build the IO Port plugin board.

ICs

ID Value Package Description
U1 ULN2803A DIP18 Darlington array

Connectors

ID Type Description
J1 2x5 100mil R/A socket IO Port socket
J2 3-way 5mm 16A terminal block Output connections
J3 3-way 5mm 16A terminal block Output connections
J4 3-way 5mm 16A terminal block Output connections
J5 3-way 5mm 16A terminal block Output connections
J6 3-way 5mm 16A terminal block Output connections
J7 3-way 5mm 16A terminal block Output connections
J8 3-way 5mm 16A terminal block Output connections
J9 3-way 5mm 16A terminal block Output connections
J10 1x2 100mil header Relay coil supply in
J11 1x2 100mil header Relay coil supply out
J12 3-way 5mm 16A terminal block Common mains supply in

Misc

ID Value Package Description
REL1-8 5-10A SPDT PCB mount Mains relay
Updated on 2010-04-25 13:39:12 +0000 | Requested on 2020-10-27 12:13:17 +0000