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Std edition USB RS232 Relay

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License: CERN Open Hardware License

Published Time: 2021-04-11 18:55:33
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Description
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
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schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 2N3904 Q1 TO-92(TO-92-3) 1
2 1k R3,R1,R2 AXIAL-0.3 3
3 DS1037-09FNAKT74-0CC J1 DSUB9-1 1
4 1N4148 D1,D2 DO-35 2
5 2.1MMJACK U1 PJ-102A 1
6 LED LED1,LED2 LED-5MM 2
7 SRD-12VDC-SL-C RELAY1 RELAY-SL-SRD 1
8 WJ2EDGVC-5.08-2P P1,P2 WJ2EDGVC-5.08-2P 2

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