warn about ESP32 input-only pins

schlimmchen · Sep 9, 2024 · 4cf6332 · 4cf6332
1 parent 0b10fe4
commit 4cf6332
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/docs/hardware/esp32nodemcu_38pin.md b/docs/hardware/esp32nodemcu_38pin.md
@@ -8,6 +8,10 @@
     used](limitations.md#using-uart0) by the ESP32's bootloader and by the
     firmware to print messages.
 
+!!!warning "Input-Only Pins"
+    Pins GPIO 34, 35, 36, and 39 are input-only pins and cannot be used as
+    outputs. If you are not sure what that means, do not use these pins at all.
+
 To use this board please refer to the [Device
 Profile](../firmware/device_profiles.md) called `nodemcu_esp32.json` or
 `blinkyparts_esp32.json`. Both are nicely compatible with the dev board. Open