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
Project images are for reference only. Actual production is based on the manufacturing files on the project page.
Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
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for issues caused by unsuitable parameter selections.
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