From a0cfea87a1739e220423ab5041af89c3554ef89d Mon Sep 17 00:00:00 2001
From: Jonathan Bennett <jbennett@incomsystems.biz>
Date: Thu, 11 Dec 2025 12:46:05 -0600
Subject: [PATCH] More blinkenlights work for Thinknode-m3

---
 src/mesh/NodeDB.cpp                           |  4 +--
 src/modules/StatusLEDModule.cpp               | 25 +++++++++++++++++--
 src/modules/StatusLEDModule.h                 |  4 ++-
 .../nrf52840/ELECROW-ThinkNode-M3/variant.h   |  1 +
 4 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/src/mesh/NodeDB.cpp b/src/mesh/NodeDB.cpp
index 192f29553..1552c1ea6 100644
--- a/src/mesh/NodeDB.cpp
+++ b/src/mesh/NodeDB.cpp
@@ -805,11 +805,11 @@ void NodeDB::installDefaultModuleConfig()
     moduleConfig.external_notification.output_ms = 500;
     moduleConfig.external_notification.nag_timeout = 2;
 #endif
-#if defined(RAK4630) || defined(RAK11310) || defined(RAK3312) || defined(MUZI_BASE)
+#if defined(RAK4630) || defined(RAK11310) || defined(RAK3312) || defined(MUZI_BASE) || defined(ELECROW_ThinkNode_M3)
     // Default to RAK led pin 2 (blue)
     moduleConfig.external_notification.enabled = true;
     moduleConfig.external_notification.output = PIN_LED2;
-#if defined(MUZI_BASE)
+#if defined(MUZI_BASE) || defined(ELECROW_ThinkNode_M3)
     moduleConfig.external_notification.active = false;
 #else
     moduleConfig.external_notification.active = true;
diff --git a/src/modules/StatusLEDModule.cpp b/src/modules/StatusLEDModule.cpp
index fc9ed310e..04cd7326f 100644
--- a/src/modules/StatusLEDModule.cpp
+++ b/src/modules/StatusLEDModule.cpp
@@ -26,7 +26,11 @@ int StatusLEDModule::handleStatusUpdate(const meshtastic::Status *arg)
                 power_state = charged;
             }
         } else {
-            power_state = discharging;
+            if (powerStatus->getBatteryChargePercent() > 5) {
+                power_state = discharging;
+            } else {
+                power_state = critical;
+            }
         }
         break;
     }
@@ -58,16 +62,33 @@ int StatusLEDModule::handleStatusUpdate(const meshtastic::Status *arg)
 
 int32_t StatusLEDModule::runOnce()
 {
+    my_interval = 1000;
 
     if (power_state == charging) {
         CHARGE_LED_state = !CHARGE_LED_state;
     } else if (power_state == charged) {
         CHARGE_LED_state = LED_STATE_ON;
+    } else if (power_state == critical) {
+        if (POWER_LED_starttime + 30000 < millis() && !doing_fast_blink) {
+            doing_fast_blink = true;
+            POWER_LED_starttime = millis();
+        }
+        if (doing_fast_blink) {
+            PAIRING_LED_state = LED_STATE_OFF;
+            CHARGE_LED_state = !CHARGE_LED_state;
+            my_interval = 250;
+            if (POWER_LED_starttime + 2000 < millis()) {
+                doing_fast_blink = false;
+            }
+        } else {
+            CHARGE_LED_state = LED_STATE_OFF;
+        }
+
     } else {
         CHARGE_LED_state = LED_STATE_OFF;
     }
 
-    if (!config.bluetooth.enabled || PAIRING_LED_starttime + 30 * 1000 < millis()) {
+    if (!config.bluetooth.enabled || PAIRING_LED_starttime + 30 * 1000 < millis() || doing_fast_blink) {
         PAIRING_LED_state = LED_STATE_OFF;
     } else if (ble_state == unpaired) {
         if (slowTrack) {
diff --git a/src/modules/StatusLEDModule.h b/src/modules/StatusLEDModule.h
index d9e3a4f33..d90ff718c 100644
--- a/src/modules/StatusLEDModule.h
+++ b/src/modules/StatusLEDModule.h
@@ -31,8 +31,10 @@ class StatusLEDModule : private concurrency::OSThread
     bool PAIRING_LED_state = LED_STATE_OFF;
 
     uint32_t PAIRING_LED_starttime = 0;
+    uint32_t POWER_LED_starttime = 0;
+    bool doing_fast_blink = false;
 
-    enum PowerState { discharging, charging, charged };
+    enum PowerState { discharging, charging, charged, critical };
 
     PowerState power_state = discharging;
 
diff --git a/variants/nrf52840/ELECROW-ThinkNode-M3/variant.h b/variants/nrf52840/ELECROW-ThinkNode-M3/variant.h
index 2ad3efa27..a27a344d2 100644
--- a/variants/nrf52840/ELECROW-ThinkNode-M3/variant.h
+++ b/variants/nrf52840/ELECROW-ThinkNode-M3/variant.h
@@ -54,6 +54,7 @@ extern "C" {
 #define LED_POWER red_LED_PIN
 #define LED_CHARGE LED_POWER // Signals the Status LED Module to handle this LED
 #define green_LED_PIN 35
+#define PIN_LED2 green_LED_PIN
 #define LED_BLUE 37
 #define LED_PAIRING LED_BLUE // Signals the Status LED Module to handle this LED