This project creates a smart baby monitor that detects when your baby wakes up and sends an alert to your phone. Unlike traditional audio or video monitors, this system uses a PIR sensor to detect movement in the crib without intrusive cameras or microphones, preserving privacy while still alerting you when the baby is awake.<\/p>\n
Difficulty:<\/strong> Intermediate A PIR sensor is positioned above or near the crib to detect motion. When the baby moves (wakes up), the ESP32 detects the motion and sends a notification to your phone via Blynk or Telegram. A sensitivity adjustment ensures small movements (like breathing) don’t trigger false alerts while larger movements (waking up) do.<\/p>\n VCC<\/th>\n 3.3V<\/th>\n GND<\/th>\n GND<\/th>\n OUT<\/th>\n GPIO 4<\/th>\n DATA<\/th>\n GPIO 5<\/th>\n DATA<\/th>\n GPIO 6<\/th>\n Positive<\/th>\n GPIO 7<\/th>\n<\/tbody>\n \u8868<\/p>\n This PIR-based baby monitor provides peace of mind without intrusive cameras or constant audio monitoring. You will know exactly when your baby wakes up, allowing you to respond promptly while preserving privacy.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a smart baby monitor that detects when your baby wakes up and sends an alert to your phone. Unlike traditional audio or video monitors, this system uses a PIR sensor to detect movement in the crib without intrusive cameras or microphones, preserving privacy while still alerting you when the baby […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-3912","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 2 hours
\nEstimated cost:<\/strong> $20-30<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Blynk Setup<\/h2>\n
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Circuit Diagram<\/h2>\n
Connection Table<\/h3>\n
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Component<\/th>\n Pin<\/th>\n ESP32 Pin<\/th>\n<\/thead>\n \nPIR Sensor<\/th>\n PIR Sensor<\/th>\n PIR Sensor<\/th>\n DHT22<\/th>\n WS2812B LED<\/th>\n Buzzer<\/th>\n Arduino Code (Blynk IoT Platform)<\/h2>\n
\/\/ PIR Baby Monitor with Blynk\n#include <WiFi.h>\n#include <BlynkSimpleEsp32.h>\n#include <DHT.h>\n#include <FastLED.h>\n\n#define BLYNK_TEMPLATE_ID \"YourTemplateID\"\n#define BLYNK_TEMPLATE_NAME \"Baby Monitor\"\n#define BLYNK_AUTH_TOKEN \"YourAuthToken\"\n\nchar ssid[] = \"YourWiFiSSID\";\nchar pass[] = \"YourWiFiPassword\";\n\nconst int pirPin = 4;\nconst int dhtPin = 5;\nconst int ledPin = 6;\nconst int buzzerPin = 7;\n\n#define DHTTYPE DHT22\nDHT dht(dhtPin, DHTTYPE);\n\n#define NUM_LEDS 8\nCRGB leds[NUM_LEDS];\nbool nightLightOn = false;\n\nunsigned long lastAlertTime = 0;\nconst unsigned long alertCooldown = 300000;\nbool motionDetectedFlag = false;\n\nvoid setup() {\n Serial.begin(115200);\n \n pinMode(pirPin, INPUT);\n pinMode(buzzerPin, OUTPUT);\n digitalWrite(buzzerPin, LOW);\n \n FastLED.addLeds<WS2812B, ledPin, GRB>(leds, NUM_LEDS);\n FastLED.setBrightness(64);\n FastLED.clear();\n \n dht.begin();\n \n Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);\n \n delay(60000);\n}\n\nBLYNK_WRITE(V0) {\n nightLightOn = param.asInt();\n if (nightLightOn) {\n for (int i = 0; i < NUM_LEDS; i++) leds[i] = CRGB(255, 180, 100);\n FastLED.show();\n } else {\n FastLED.clear();\n FastLED.show();\n }\n}\n\nvoid sendAlert() {\n if (millis() - lastAlertTime > alertCooldown) {\n Blynk.logEvent(\"baby_wakeup\", \"Baby is waking up!\");\n lastAlertTime = millis();\n \n tone(buzzerPin, 1000, 200);\n delay(200);\n tone(buzzerPin, 1500, 200);\n \n if (!nightLightOn) {\n for (int i = 0; i < NUM_LEDS; i++) leds[i] = CRGB(255, 180, 100);\n FastLED.show();\n delay(10000);\n if (!nightLightOn) FastLED.clear();\n FastLED.show();\n }\n }\n}\n\nvoid readAndSendTemperature() {\n float temp = dht.readTemperature();\n float humidity = dht.readHumidity();\n \n if (!isnan(temp)) {\n Blynk.virtualWrite(V1, temp);\n Blynk.virtualWrite(V2, humidity);\n }\n}\n\nvoid loop() {\n Blynk.run();\n \n bool motion = digitalRead(pirPin) == HIGH;\n \n if (motion && !motionDetectedFlag) {\n motionDetectedFlag = true;\n sendAlert();\n }\n \n if (!motion) motionDetectedFlag = false;\n \n static unsigned long lastTempRead = 0;\n if (millis() - lastTempRead > 30000) {\n readAndSendTemperature();\n lastTempRead = millis();\n }\n \n delay(100);\n}\n<\/code><\/pre>\nTelegram Bot Version (No Blynk Account)<\/h2>\n
#include <WiFi.h>\n#include <UniversalTelegramBot.h>\n\nconst char* ssid = \"YourWiFiSSID\";\nconst char* password = \"YourWiFiPassword\";\nconst char* botToken = \"YourTelegramBotToken\";\nconst char* chatID = \"YourChatID\";\n\nWiFiClientSecure client;\nUniversalTelegramBot bot(botToken, client);\n\nconst int pirPin = 4;\nunsigned long lastAlertTime = 0;\nconst unsigned long alertCooldown = 300000;\n\nvoid setup() {\n Serial.begin(115200);\n pinMode(pirPin, INPUT);\n \n WiFi.begin(ssid, password);\n while (WiFi.status() != WL_CONNECTED) delay(500);\n \n client.setCACert(TELEGRAM_CERTIFICATE_ROOT);\n delay(60000);\n}\n\nvoid sendTelegramAlert() {\n if (millis() - lastAlertTime > alertCooldown) {\n bot.sendMessage(chatID, \"Baby is waking up! \ud83d\udc76\", \"\");\n lastAlertTime = millis();\n }\n}\n\nvoid loop() {\n if (digitalRead(pirPin) == HIGH) {\n sendTelegramAlert();\n delay(10000);\n }\n delay(100);\n}\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Conclusion<\/h2>\n