low power display

2 files changed, 8 insertions, 4 deletions

diff --git a/display.h b/display.h
index 40e9bce..68c948f 100644
--- a/display.h
+++ b/display.h
@@ -61,5 +61,7 @@ public:
 
     // "partial" update
     display.updateWindow(0, 0, GxEPD_WIDTH, GxEPD_HEIGHT, false);
+
+    display.powerDown();
   }
 };
diff --git a/main.ino b/main.ino
index 8dcb387..180f5cd 100644
--- a/main.ino
+++ b/main.ino
@@ -36,11 +36,13 @@ void setup() {
 }
 
 void loop() {
-  if (battery.dataReady()) battery.read(&data);
-  if (pm.dataReady()) pm.read(&data);
-  if (co2.dataReady()) co2.read(&data);
+  bool changed;
 
-  display.show(&data);
+  if (battery.dataReady()) { changed=true; battery.read(&data); }
+  if (pm.dataReady()) { changed = true; pm.read(&data); }
+  if (co2.dataReady()) { changed = true; co2.read(&data); }
+
+  if (changed) display.show(&data);
   
   delay(5000);
 }