RS-232C Selector
TTL-RS-232C Converter Selector.
Raspberry pi GPIO. RXD,TXD and one GPO to select one of two RS-232C RXD can be used.
I desgned it to connect Raspberry Pi to a Voltmeter and a Ammeter ,BY-56W(GWUNW) .
BOM
Designator Quantity Part Number
C1, C2, C3, C4, C6, C7, C8, C9, C10 9 GRM188B31H104KA92D 0.1uF
C5, C11 2 GRM188B30J475KE18D 4.7uF
CN1, CN2 2 B4B-XH-A or Pin Header
CN3 1 B6B-XH-A or Pin Header
R1, R2 2 EXB38V103JV 10k x 4
U1, U2 2 ST3222ECTR
U3 1 SN74LVC1G139DCUR
RS-232C Selector
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Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
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