Implement 1h auto shutdown if no input handling

LightMeterV2/src/LightMeter.cpp

@@ -25,6 +25,8 @@ void cfgPushButton(Bounce &bB) {
  * Button down = next menu, up = previous menu
  */
 void onButtonReleased(Button& btn, uint16_t duration) {
+  myLightMeter.lastActivity = millis(); // reset counter
+
   Serial.println("button pressed");
   // UP button
   if (btn.is(uiPbUp)) {
@@ -62,25 +64,8 @@ void onButtonReleased(Button& btn, uint16_t duration) {
   } else if (btn.is(uiPbEnter)) {
     Serial.println("ENTER button pressed");
     if (myLightMeter.state == MSystem) {
-      oled.clear(PAGE);
-      oled.setFontType(1);
-      oled.setCursor(6, 6);
-      oled.print("Power down.");
-      oled.display();
-      delay(1000);
-      myLightMeter.powerDown();
-      delay(4000);
+      myLightMeter.powerDown(false);
 
-      myLightMeter.ledStatus(LED_KO);
-      oled.clear(PAGE);
-      oled.setCursor(6, 6);
-      oled.print("Failed !");
-      oled.display();
-      delay(1000);
-
-      oled.setFontType(0);
-      oled.clear(PAGE);
-      oled.display();
       myLightMeter.state = MSystemInit;
     } else if (myLightMeter.state == MMary) {
       if (myLightMeter.heartCount < 7) {
@@ -146,6 +131,10 @@ void setup() {
 void loop() {
   delay(10); // wait 10ms
 
+  if (millis() - myLightMeter.lastActivity > SLEEP_AFTER) {
+    myLightMeter.powerDown(true);
+  }
+
   myLightMeter.process();
   //Serial.println("loop");
 }
@@ -190,13 +179,41 @@ void LightMeter::saveConfigUser() {
 }
 
 // Sleep time
-void LightMeter::powerDown() {
-  // Last minute things
-  saveConfigUser();
-  delay(10);
+void LightMeter::powerDown(bool autosleep) {
+      oled.clear(PAGE);
+      oled.setFontType(1);
+      oled.setCursor(6, 6);
+      if (autosleep) {
+        oled.print("Auto sleep zZz");
+      } else {
+        oled.print("Power down.");
+      }
+      oled.display();
+      delay(1000);
+
+      // Last minute things
+      saveConfigUser();
+      delay(10);
 
-  // Try to shutdown
-  digitalWrite(PIN_POWER_ON, LOW);
+      // Try to shutdown
+      digitalWrite(PIN_POWER_ON, LOW);
+
+      // Oops failed
+      lastActivity = millis(); // reset counter
+      delay(4000);
+
+      myLightMeter.ledStatus(LED_KO);
+      oled.clear(PAGE);
+      oled.setCursor(6, 6);
+      oled.print("Failed !");
+      oled.display();
+      delay(1000);
+
+      oled.setFontType(0);
+      oled.clear(PAGE);
+      oled.display();
+
+      myLightMeter.state = MSystemInit;
 }
 
 // state 0 OK, state 1 KO
@@ -641,6 +658,7 @@ void LightMeter::process(void) {
 
   if (curEncoderPos != lastEncoderPos) {
     // Encoder moved, set new position
+    myLightMeter.lastActivity = millis(); // reset counter
     lastEncoderPos = curEncoderPos;
   }
 

LightMeterV2/src/LightMeter.h

@@ -64,6 +64,13 @@
 #define PIN_LED_OK 11
 #define PIN_LED_KO 10
 
+/* Auto sleep after
+ * 3600000 = 1h
+ *   60000 = 1mn
+ *    1000 = 1sec
+ */
+#define SLEEP_AFTER 3600000
+
 // Menu State
 enum MState_t {
     Minit,                  // Initial state page
@@ -157,7 +164,7 @@ class LightMeter {
     public:
         LightMeter(void);
         void process();
-        void powerDown(void);
+        void powerDown(bool);
         void ledStatus(int state);
 
         bool lipoGood;
@@ -169,6 +176,8 @@ class LightMeter {
         double lux;
         uint8_t heartCount;
 
+        uint32_t lastActivity = 0;
+
         MState_t state;
         holdState_t triggerState;
 

README.MD

@@ -44,7 +44,6 @@ The TSL2591 doesn't permit changing I2C address, you can only have one.
 
  - Reducing enclosure thickness by around 5mm by trimming the teensyview pins and document the needed size
  - Design some sort of sliding window to protect the sensor
- - Power saving, shutdown after maybe 1h without use
  - Test sensor overflow and alert
  - Finish RED/GREEN led handling
  - Games, because why not ?

USAGE.md

@@ -8,7 +8,7 @@ The top button is the power-on, and previous-menu, the bottom one is next-menu.
 
 To power-on the light meter, press the top button for a few seconds.
 
-To power-down the light meter, go to the system menu and press the encoder.
+To power-down the light meter, go to the system menu and press the encoder. An auto-power down is also implemented, if there is no knob or button handling in one hour, it will auto power-off to save battery life.
 
 If charging, a small "plug" icon will appears on left of the battery indicator on top-right.