From ae9068a4c43e6db15daa45092bb47613382ea6cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Edvard=20Filistovi=C4=8D?= <efilistovic@gmail.com>
Date: Sun, 5 Apr 2026 22:17:12 +0300
Subject: [PATCH] [internal_temperature] Add support for LN882X (Lightning
 LN882H) (#15370)

Co-authored-by: Bl00d-B0b <Bl00d-B0b@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@home-assistant.io>
---
 .../internal_temperature_ln882x.cpp           | 24 +++++++++++++++++++
 .../components/internal_temperature/sensor.py | 14 ++++++++++-
 .../internal_temperature/test.ln882x-ard.yaml |  1 +
 3 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 esphome/components/internal_temperature/internal_temperature_ln882x.cpp
 create mode 100644 tests/components/internal_temperature/test.ln882x-ard.yaml

diff --git a/esphome/components/internal_temperature/internal_temperature_ln882x.cpp b/esphome/components/internal_temperature/internal_temperature_ln882x.cpp
new file mode 100644
index 0000000000..621fbed030
--- /dev/null
+++ b/esphome/components/internal_temperature/internal_temperature_ln882x.cpp
@@ -0,0 +1,24 @@
+#ifdef USE_LN882X
+
+#include "internal_temperature.h"
+
+extern "C" {
+uint16_t hal_adc_get_data(uint32_t adc_base, uint32_t ch);
+}
+
+namespace esphome::internal_temperature {
+
+void InternalTemperatureSensor::update() {
+  static constexpr uint32_t ADC_BASE = 0x40000800U;
+  static constexpr uint32_t ADC_CH0 = 1U;
+  static constexpr uint16_t ADC_MASK = 0xFFF;
+  static constexpr float ADC_TEMP_SCALE = 2.54f;
+  static constexpr float ADC_TEMP_OFFSET = 278.15f;
+  uint16_t raw = hal_adc_get_data(ADC_BASE, ADC_CH0);
+  float temperature = (raw & ADC_MASK) / ADC_TEMP_SCALE - ADC_TEMP_OFFSET;
+  this->publish_state(temperature);
+}
+
+}  // namespace esphome::internal_temperature
+
+#endif  // USE_LN882X
diff --git a/esphome/components/internal_temperature/sensor.py b/esphome/components/internal_temperature/sensor.py
index 6d79e08675..02730b6862 100644
--- a/esphome/components/internal_temperature/sensor.py
+++ b/esphome/components/internal_temperature/sensor.py
@@ -8,6 +8,7 @@ from esphome.const import (
     ENTITY_CATEGORY_DIAGNOSTIC,
     PLATFORM_BK72XX,
     PLATFORM_ESP32,
+    PLATFORM_LN882X,
     PLATFORM_NRF52,
     PLATFORM_RP2040,
     STATE_CLASS_MEASUREMENT,
@@ -30,7 +31,15 @@ CONFIG_SCHEMA = cv.All(
         state_class=STATE_CLASS_MEASUREMENT,
         entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
     ).extend(cv.polling_component_schema("60s")),
-    cv.only_on([PLATFORM_ESP32, PLATFORM_RP2040, PLATFORM_BK72XX, PLATFORM_NRF52]),
+    cv.only_on(
+        [
+            PLATFORM_ESP32,
+            PLATFORM_RP2040,
+            PLATFORM_BK72XX,
+            PLATFORM_NRF52,
+            PLATFORM_LN882X,
+        ]
+    ),
 )
 
 
@@ -53,6 +62,9 @@ FILTER_SOURCE_FILES = filter_source_files_from_platform(
         "internal_temperature_bk72xx.cpp": {
             PlatformFramework.BK72XX_ARDUINO,
         },
+        "internal_temperature_ln882x.cpp": {
+            PlatformFramework.LN882X_ARDUINO,
+        },
         "internal_temperature_zephyr.cpp": {PlatformFramework.NRF52_ZEPHYR},
     }
 )
diff --git a/tests/components/internal_temperature/test.ln882x-ard.yaml b/tests/components/internal_temperature/test.ln882x-ard.yaml
new file mode 100644
index 0000000000..dade44d145
--- /dev/null
+++ b/tests/components/internal_temperature/test.ln882x-ard.yaml
@@ -0,0 +1 @@
+<<: !include common.yaml