From c244565e355483e403cce7f3a4ca203b9b23d905 Mon Sep 17 00:00:00 2001
From: Jonathan Bennett <jbennett@incomsystems.biz>
Date: Mon, 4 Aug 2025 12:46:16 -0500
Subject: [PATCH] Turn backlight off when screen sleeps

---
 src/graphics/Screen.cpp | 9 +++++++++
 src/main.cpp            | 2 --
 src/main.h              | 5 +++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/graphics/Screen.cpp b/src/graphics/Screen.cpp
index f22a0d8a8..f04d20c27 100644
--- a/src/graphics/Screen.cpp
+++ b/src/graphics/Screen.cpp
@@ -391,6 +391,10 @@ void Screen::handleSetOn(bool on, FrameCallback einkScreensaver)
             dispdev->displayOn();
 #endif
 
+#ifdef ELECROW_ThinkNode_M5
+            io.digitalWrite(PCA_PIN_EINK_EN, HIGH);
+#endif
+
 #if defined(ST7789_CS) &&                                                                                                        \
     !defined(M5STACK) // set display brightness when turning on screens. Just moved function from TFTDisplay to here.
             static_cast<TFTDisplay *>(dispdev)->setDisplayBrightness(brightness);
@@ -425,6 +429,11 @@ void Screen::handleSetOn(bool on, FrameCallback einkScreensaver)
                 digitalWrite(PIN_EINK_EN, LOW);
             }
 #endif
+
+#ifdef ELECROW_ThinkNode_M5
+            io.digitalWrite(PCA_PIN_EINK_EN, LOW);
+#endif
+
             dispdev->displayOff();
 #ifdef USE_ST7789
             SPI1.end();
diff --git a/src/main.cpp b/src/main.cpp
index 7c0fdc3b3..6a37a3b2b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -39,8 +39,6 @@
 #include <utility>
 
 #ifdef ELECROW_ThinkNode_M5
-#include <PCA9557.h>
-#include <Wire.h>
 PCA9557 io(0x18, &Wire);
 #endif
 
diff --git a/src/main.h b/src/main.h
index 7105bd62b..3568daad2 100644
--- a/src/main.h
+++ b/src/main.h
@@ -51,6 +51,11 @@ extern Adafruit_DRV2605 drv;
 extern AudioThread *audioThread;
 #endif
 
+#ifdef ELECROW_ThinkNode_M5
+#include <PCA9557.h>
+extern PCA9557 io;
+#endif
+
 #ifdef HAS_UDP_MULTICAST
 #include "mesh/udp/UdpMulticastHandler.h"
 extern UdpMulticastHandler *udpHandler;