USB RS232 Relay ------------------- The main objective of this board is to ring an school bell using a PC program written in python. - This project is the interface of a PC to a Relay using a simple USB RS232 adapter. - This approach was selected because the parts are easily found in any PC parts store. - The relay is activated/deactivated using the RTS line of the serial port, any other line is unused. **Author:** Mario Esmeral (mario.esmeral@royalschool.edu.co) ---------- Design Criteria --------------- - Parts should be easily available. - It must have over current protection. - USB powered is desirable but not mandatory. - It must have power and activation visual indicators. ---------- Changelog --------- V1.0.0 First version. ---------- References ---------- [1] http://www.cedarlakeinstruments.com/SharedFiles/io.html [2] http://vusb.wikidot.com/project:driver-less-usb-relays-hid-interface [3] https://github.com/pavel-a/usb-relay-hid