ModuleRelay - sm0svx/svxlink GitHub Wiki
This Module is a contribution by EB5EKT/Elias:
With SvxLink I can control 8 relays using the parallel port for switch the repeaters or switch between AC and battery. Also the relays are controlled with crontab for the charging cicles.
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http://webs.ono.com/esp5em/Svxlink_Relay_LPT.pdf - Mini HOWTO
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http://webs.ono.com/esp5em/RELAY_8_ENG.pdf - Radioclub repeater installation
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http://bigasterisk.com/projects/parallel - The code for control the parallel port
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http://webs.ono.com/esp5em/Relay_schematic.pdf - Schematic
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http://webs.ono.com/esp5em/Relay_Board.max - Orcad Layout