From 78b6ac5ebbaf3cdc5507793a6921188dbe4e3ddd Mon Sep 17 00:00:00 2001
From: Marcin Przybylek <marcin.przybylek@gmail.com>
Date: Mon, 9 Feb 2026 16:38:23 +0100
Subject: [PATCH] Add PIN_VBAT_READ definition to build flags for Xiao_S3_WIO

---
 variants/xiao_s3_wio/XiaoS3WIOBoard.h | 5 +++++
 variants/xiao_s3_wio/platformio.ini   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/variants/xiao_s3_wio/XiaoS3WIOBoard.h b/variants/xiao_s3_wio/XiaoS3WIOBoard.h
index 7ae06a359..e843ff3f3 100644
--- a/variants/xiao_s3_wio/XiaoS3WIOBoard.h
+++ b/variants/xiao_s3_wio/XiaoS3WIOBoard.h
@@ -3,6 +3,11 @@
 #include <Arduino.h>
 #include <helpers/ESP32Board.h>
 
+// built-ins
+#ifndef PIN_VBAT_READ              // set in platformio.ini for boards with pulled A0 to VBAT and GND (220kohm)
+  #define  PIN_VBAT_READ    1
+#endif
+
 class XiaoS3WIOBoard : public ESP32Board {
 public:
   XiaoS3WIOBoard() { }
diff --git a/variants/xiao_s3_wio/platformio.ini b/variants/xiao_s3_wio/platformio.ini
index 22bb4090a..f0fa89b31 100644
--- a/variants/xiao_s3_wio/platformio.ini
+++ b/variants/xiao_s3_wio/platformio.ini
@@ -28,6 +28,7 @@ build_flags = ${esp32_base.build_flags}
   -D WRAPPER_CLASS=CustomSX1262Wrapper
   -D LORA_TX_POWER=22
   -D SX126X_RX_BOOSTED_GAIN=1
+  -D PIN_VBAT_READ=1
 build_src_filter = ${esp32_base.build_src_filter}
   +<../variants/xiao_s3_wio>
   +<helpers/sensors>