I bought this USB to TTL converter and it came with the option to switch between 5v and 3.3v. I want to use it at 3.3v, but I'm not sure where the (grounder?) should be placed? Thanks, see image below. (5v and 3v3 option is on the side upside down).
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\$\begingroup\$ Data sheet is where? Have you read it? Any documentation links? \$\endgroup\$– Andy akaCommented Aug 10, 2020 at 20:51
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\$\begingroup\$ Plug it into your computer, and measure the votlage between VCC and GND with a multimeter. \$\endgroup\$– DKNguyenCommented Aug 10, 2020 at 20:54
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\$\begingroup\$ No data sheet and the little manual it came with says you can switch between 5v and 3.3v, but dosen't specify how or give any useful info apart from downloading the driver. This is the amazon URL: amazon.ca/gp/product/B07BBPX8B8/… \$\endgroup\$– August KimoCommented Aug 10, 2020 at 20:54
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3\$\begingroup\$ In the future, never buy something without a datasheet. \$\endgroup\$– DKNguyenCommented Aug 10, 2020 at 20:59
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1\$\begingroup\$ @DKNguyen that jumper does not necessarily control the voltage on the Vcc pin. Most likely it controls the logic voltage, though indeed without documentation, who knows? \$\endgroup\$– Chris StrattonCommented Aug 10, 2020 at 21:36
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Based on the photo, the thing is set for 3.3 Volts. To set it for 5 V, move the black jumper to cover the center and right pins.
answered Aug 10, 2020 at 21:01
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1\$\begingroup\$ While that's true, it's not clear what seeing it for 3v3 governs - eg, the logic voltage or the Vcc voltage. Both? Neither? \$\endgroup\$ Commented Aug 10, 2020 at 21:36