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+--- Thread: Wiegand and GPIO on T16M (/showthread.php?tid=8875)
Wiegand and GPIO on T16M - robarends - 01-03-2026
Hello,
I have a T16M (ESPHome), and I need to connect 4 Wiegand keypads (8 GPIO required). There are 7 GPIO, and 2 RS485 available.
Are the RS485 connections just a UART, and can be used for a Wiegand D0/D1 ?
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I have noticed in your videos on Wiegand that you use the UART rx/tx connections on the example boards.
Is that because they are 5v logic, and are required to connect the 5V D0/D1 from the Wiegand keypad?
I assume the ESP32 will be damaged if I connect the D0/D1 to the GPIO connections of an ESP32 based board like the T16M?
Thank you.
Rob
RE: Wiegand and GPIO on T16M - admin - 01-04-2026
RS485 pin can't use for wiegand, it have connect with RS485 chip.
you can connect wiegand D1 and D2 to T16M free GPIOs directly, not need logic convert.
RE: Wiegand and GPIO on T16M - robarends - 01-04-2026
(01-04-2026, 01:18 AM)admin Wrote: RS485 pin can't use for wiegand, it have connect with RS485 chip.
you can connect wiegand D1 and D2 to T16M free GPIOs directly, not need logic convert.
thank you.
Does that mean all the GPIOs are 5v logic, or are 3V3 logic but are 5v tolerant?
Thanks, Rob
RE: Wiegand and GPIO on T16M - admin - 01-04-2026
free GPIO use by ESP32 pin 3.3v. but it can use for 5v, so you can connect with wiegand Data directly.