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pir_light_relay_sleep_light_voltage.ino

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+/*
+ * ESP32 PIR Motion Light Controller with Deep Sleep
+ * 
+ * This sketch uses a PIR motion sensor to wake the ESP32 from deep sleep,
+ * turns on a light via relay for a configurable duration, then returns to
+ * deep sleep after a delay to save power.
+ * 
+ * Hardware:
+ * - ESP32 Dev Module
+ * - PIR Motion Sensor
+ * - Relay Module
+ */
+
+#include <Arduino.h>
+#include "esp_sleep.h"
+#include "driver/rtc_io.h"
+
+// Pin definitions
+const int PIR_PIN = 13;      // GPIO pin connected to PIR sensor output
+const int RELAY_PIN = 12;    // GPIO pin connected to relay control
+
+// Configuration
+//const int LIGHT_ON_DURATION = 30000;  // Duration to keep light on (30 seconds)
+const int SLEEP_DELAY = 10000;        // Delay before going to sleep (10 seconds)
+
+// Variables
+unsigned long motionDetectedTime = 0;
+bool lightOn = false;
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000); // Allow serial to initialize
+  
+  Serial.println("ESP32 PIR Motion Light Controller");
+  
+  // Configure pins
+  pinMode(PIR_PIN, INPUT);
+  pinMode(RELAY_PIN, OUTPUT);
+  
+  // Turn off relay initially
+  digitalWrite(RELAY_PIN, LOW);
+  
+  // Check wake-up reason
+  esp_sleep_wakeup_cause_t wakeup_reason = esp_sleep_get_wakeup_cause();
+  
+  if (wakeup_reason == ESP_SLEEP_WAKEUP_EXT0) {
+    Serial.println("Woken up by external signal (PIR sensor)");
+    // Motion detected, turn on light
+    turnLightOn();
+  } else {
+    Serial.println("First boot or reset");
+  }
+}
+
+void loop() {
+  // Check if motion is detected (for initial boot or if already awake)
+  if (digitalRead(PIR_PIN) == HIGH && !lightOn) {
+    Serial.println("Motion detected!");
+    turnLightOn();
+  }
+  
+  // Check if it's time to turn off the light
+  if (lightOn && (millis() - motionDetectedTime > LIGHT_ON_DURATION)) {
+    Serial.println("Light timer expired, turning off");
+    turnLightOff();
+    
+    // Wait a bit before going to sleep
+    Serial.println("Waiting before sleep...");
+    delay(SLEEP_DELAY);
+    
+    // Go to deep sleep
+    goToSleep();
+  }
+  
+  delay(100); // Small delay to prevent CPU hogging
+}
+
+void turnLightOn() {
+  digitalWrite(RELAY_PIN, HIGH);
+  lightOn = true;
+  motionDetectedTime = millis();
+  Serial.println("Light turned ON");
+}
+
+void turnLightOff() {
+  digitalWrite(RELAY_PIN, LOW);
+  lightOn = false;
+  Serial.println("Light turned OFF");
+}
+
+void goToSleep() {
+  Serial.println("Going to deep sleep now");
+  Serial.flush();
+  
+  // Configure wake-up source (PIR sensor connected to GPIO)
+  esp_sleep_enable_ext0_wakeup(GPIO_NUM_13, HIGH); // Use RTC GPIO for wake-up
+  
+  // Enter deep sleep
+  esp_deep_sleep_start();
+}