From 61a8821d3c6f950738c3bd35bd13b0dfbefc6af0 Mon Sep 17 00:00:00 2001
From: Quency-D <hj_zzns@163.com>
Date: Thu, 16 Jul 2026 17:45:00 +0800
Subject: [PATCH] Optimize battery voltage reading

---
 variants/heltec_rc32/HeltecRC32Board.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/variants/heltec_rc32/HeltecRC32Board.cpp b/variants/heltec_rc32/HeltecRC32Board.cpp
index 11be483e9..0517f5ff7 100644
--- a/variants/heltec_rc32/HeltecRC32Board.cpp
+++ b/variants/heltec_rc32/HeltecRC32Board.cpp
@@ -55,6 +55,7 @@ void HeltecRC32Board::onAfterTransmit() {
 
 uint16_t HeltecRC32Board::getBattMilliVolts() {
   analogReadResolution(12);
+  analogSetAttenuation(ADC_2_5db);
   digitalWrite(PIN_ADC_CTRL, ADC_CTRL_ENABLED);
   delay(10);
   uint32_t raw = 0;
@@ -62,6 +63,7 @@ uint16_t HeltecRC32Board::getBattMilliVolts() {
     raw += analogReadMilliVolts(PIN_VBAT_READ);
   }
   raw = raw / 8;
+  digitalWrite(PIN_ADC_CTRL, !ADC_CTRL_ENABLED);
 
   return (adc_mult * raw);
 }