UART — ELECROW - FORUM https://forum.elecrow.com/index.php?p=/ Tue, 07 Apr 2026 20:30:55 +0000 en UART — ELECROW - FORUM UART TX low level voltage does not drop all the way to ground https://forum.elecrow.com/index.php?p=/discussion/1035/uart-tx-low-level-voltage-does-not-drop-all-the-way-to-ground Wed, 01 Jan 2025 12:15:08 +0000 Elecrow HMI Display DarioPellegrini 1035@/index.php?p=/discussions Hello, I am trying to get my CrowDisplay 5" to communicate via serial.
If I push some data on the TX line everything seems fine, but as soon as I attach the pins to another UART interface (eg an ESP32) the low level does not drop all the way to ground, but stays at around 1.6V, not enough to be detected.

Setup:

TX disconnected, low level matches ground:

TX connected, low level remains at 1.6V:

Any idea on what is causing this problem and what I could do to solve it?
Thank you!

]]> DIS07050H : CrowPanel 5.0" HMI ESP32 Display - Need Alternative Function List for additional UART https://forum.elecrow.com/index.php?p=/discussion/827/dis07050h-crowpanel-5-0-hmi-esp32-display-need-alternative-function-list-for-additional-uart Mon, 05 Aug 2024 06:30:43 +0000 Elecrow HMI Display frknn 827@/index.php?p=/discussions Hello everyone,
I am currently working on a project using CrowPanel 5.0"-HMI ESP32 Display 800x480 RGB TFT LCD Touch Screen, and I have encountered a challenge. I need to utilize an additional set of UART pins, but I am unable to find a comprehensive list of alternative functions for these pins.
Could anyone provide or direct me to a detailed list of alternative functions for the UART pins? Specifically, I am looking for information on CrowPanel 5.0"-HMI ESP32 Display 800x480 RGB TFT LCD Touch Screen and how to configure additional UART pins.

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