{"id":3920,"date":"2026-03-31T01:57:24","date_gmt":"2026-03-31T05:57:24","guid":{"rendered":"https:\/\/pirhome.com\/?p=3916"},"modified":"2026-03-31T01:57:24","modified_gmt":"2026-03-31T05:57:24","slug":"pir-esp-now-wireless-notification","status":"publish","type":"post","link":"https:\/\/www.pirhome.com\/?p=3920","title":{"rendered":"PIR Sensor Wireless Notification System with ESP-NOW"},"content":{"rendered":"

Project Overview<\/h2>\n

This project creates a wireless motion notification system that uses ESP-NOW protocol to send alerts between ESP32 boards without requiring a Wi-Fi network. It’s perfect for monitoring remote locations like workshops, sheds, or entry gates where Wi-Fi may not reach.<\/p>\n

Difficulty:<\/strong> Intermediate
\nEstimated time:<\/strong> 2-3 hours
\nEstimated cost:<\/strong> $20-30 (two ESP32 boards + PIR sensors)<\/p>\n

How It Works<\/h2>\n

Two ESP32 boards communicate via ESP-NOW, a low-power, connectionless protocol developed by Espressif. The transmitter unit has a PIR sensor. When motion is detected, it sends a packet to the receiver unit. The receiver unit can display an alert via LED, buzzer, or LCD, and can also send notifications to a phone via Wi-Fi if available.<\/p>\n

ESP-NOW works without Wi-Fi, has very low latency, and can achieve ranges of 50-100 meters line-of-sight.<\/p>\n

Materials Needed<\/h2>\n
    \n
  • ESP32 development boards<\/strong> (2) \u2013 one for transmitter, one for receiver<\/li>\n
  • HC-SR501 PIR sensor<\/strong> (1)<\/li>\n
  • LED<\/strong> (for alert indication)<\/li>\n
  • Buzzer<\/strong> (optional)<\/li>\n
  • LCD 16×2 with I2C<\/strong> (optional, for display)<\/li>\n
  • Resistors<\/strong> (220\u03a9 for LEDs)<\/li>\n
  • Jumper wires<\/strong><\/li>\n
  • Power supplies<\/strong> (5V USB or batteries)<\/li>\n
  • Enclosures<\/strong> (for weatherproofing if outdoor)<\/li>\n<\/ul>\n

    Circuit Diagram<\/h2>\n

    Transmitter Unit Connection Table<\/h3>\n\n\n\n
    Component<\/th>\nPin<\/th>\nESP32 Pin<\/th>\n<\/thead>\n
    PIR Sensor<\/th>\nVCC<\/th>\n3.3V<\/th>\n<\/tr>\nPIR Sensor<\/th>\nGND<\/th>\nGND<\/th>\n<\/tr>\nPIR Sensor<\/th>\nOUT<\/th>\nGPIO 4<\/th>\n<\/tr>\nStatus LED<\/th>\nAnode<\/th>\nGPIO 2 (through 220\u03a9)<\/th>\n<\/tr>\nStatus LED<\/th>\nCathode<\/th>\nGND<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Receiver Unit Connection Table<\/h3>\n\n\n\n
    Component<\/th>\nPin<\/th>\nESP32 Pin<\/th>\n<\/thead>\n
    Alert LED<\/th>\nAnode<\/th>\nGPIO 2 (through 220\u03a9)<\/th>\n<\/tr>\nAlert LED<\/th>\nCathode<\/th>\nGND<\/th>\n<\/tr>\nBuzzer<\/th>\nPositive<\/th>\nGPIO 5<\/th>\n<\/tr>\nBuzzer<\/th>\nNegative<\/th>\nGND<\/th>\n<\/tr>\nLCD (I2C)<\/th>\nVCC<\/th>\n3.3V<\/th>\n<\/tr>\nLCD (I2C)<\/th>\nGND<\/th>\nGND<\/th>\n<\/tr>\nLCD (I2C)<\/th>\nSDA<\/th>\nGPIO 21<\/th>\n<\/tr>\nLCD (I2C)<\/th>\nSCL<\/th>\nGPIO 22<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n

    ESP-NOW Setup: Get MAC Addresses<\/h2>\n

    First, upload this code to both ESP32 boards to get their MAC addresses:<\/p>\n

    #include <WiFi.h>\n\nvoid setup() {\n  Serial.begin(115200);\n  WiFi.mode(WIFI_STA);\n  Serial.print(\"MAC Address: \");\n  Serial.println(WiFi.macAddress());\n}\n\nvoid loop() {}\n<\/code><\/pre>\n
    Note the MAC address of the receiver board. You’ll need it for the transmitter code.<\/p>\n
    Transmitter Code<\/h2>\n
    \/\/ ESP-NOW Motion Sensor Transmitter\n#include <esp_now.h>\n#include <WiFi.h>\n\nconst int pirPin = 4;\nconst int ledPin = 2;\n\n\/\/ Replace with receiver's MAC address\nuint8_t receiverAddress[] = {0xXX, 0xXX, 0xXX, 0xXX, 0xXX, 0xXX};\n\n\/\/ Message structure\ntypedef struct struct_message {\n  int motionDetected;\n  int sensorId;\n  unsigned long timestamp;\n} struct_message;\n\nstruct_message motionData;\n\nunsigned long lastSendTime = 0;\nconst unsigned long sendCooldown = 5000; \/\/ 5 seconds between sends\n\nvoid OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {\n  Serial.print(\"Send status: \");\n  Serial.println(status == ESP_NOW_SEND_SUCCESS ? \"Success\" : \"Fail\");\n  digitalWrite(ledPin, status == ESP_NOW_SEND_SUCCESS ? HIGH : LOW);\n  delay(100);\n  digitalWrite(ledPin, LOW);\n}\n\nvoid setup() {\n  Serial.begin(115200);\n  pinMode(pirPin, INPUT);\n  pinMode(ledPin, OUTPUT);\n  digitalWrite(ledPin, LOW);\n  \n  WiFi.mode(WIFI_STA);\n  \n  if (esp_now_init() != ESP_OK) {\n    Serial.println(\"ESP-NOW init failed\");\n    return;\n  }\n  \n  esp_now_register_send_cb(OnDataSent);\n  \n  esp_now_peer_info_t peerInfo;\n  memcpy(peerInfo.peer_addr, receiverAddress, 6);\n  peerInfo.channel = 0;\n  peerInfo.encrypt = false;\n  \n  if (esp_now_add_peer(&peerInfo) != ESP_OK) {\n    Serial.println(\"Failed to add peer\");\n    return;\n  }\n  \n  Serial.println(\"Transmitter Ready\");\n  Serial.print(\"Receiver MAC: \");\n  for (int i = 0; i < 6; i++) {\n    Serial.printf(\"%02X\", receiverAddress[i]);\n    if (i < 5) Serial.print(\":\");\n  }\n  Serial.println();\n  \n  delay(60000); \/\/ PIR warm-up\n}\n\nvoid loop() {\n  bool motion = digitalRead(pirPin) == HIGH;\n  \n  if (motion && (millis() - lastSendTime > sendCooldown)) {\n    motionData.motionDetected = 1;\n    motionData.sensorId = 1;\n    motionData.timestamp = millis();\n    \n    esp_now_send(receiverAddress, (uint8_t *) &motionData, sizeof(motionData));\n    lastSendTime = millis();\n    Serial.println(\"Motion detected - sending alert\");\n  }\n  \n  delay(100);\n}\n<\/code><\/pre>\n
    Receiver Code<\/h2>\n
    \/\/ ESP-NOW Motion Sensor Receiver\n#include <esp_now.h>\n#include <WiFi.h>\n#include <Wire.h>\n#include <LiquidCrystal_I2C.h>\n\nLiquidCrystal_I2C lcd(0x27, 16, 2);\n\nconst int alertLedPin = 2;\nconst int buzzerPin = 5;\n\nunsigned long lastAlertTime = 0;\nconst unsigned long alertDuration = 5000; \/\/ 5 seconds alert indication\n\nbool alertActive = false;\nint lastMotionCount = 0;\n\n\/\/ Message structure (must match transmitter)\ntypedef struct struct_message {\n  int motionDetected;\n  int sensorId;\n  unsigned long timestamp;\n} struct_message;\n\nstruct_message motionData;\n\nvoid OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {\n  memcpy(&motionData, incomingData, sizeof(motionData));\n  \n  Serial.print(\"Motion alert from sensor \");\n  Serial.print(motionData.sensorId);\n  Serial.print(\" at \");\n  Serial.println(motionData.timestamp);\n  \n  lastMotionCount++;\n  lastAlertTime = millis();\n  alertActive = true;\n  \n  \/\/ Activate indicators\n  digitalWrite(alertLedPin, HIGH);\n  tone(buzzerPin, 2000, 500);\n  \n  \/\/ Update LCD\n  lcd.clear();\n  lcd.setCursor(0, 0);\n  lcd.print(\"Motion detected!\");\n  lcd.setCursor(0, 1);\n  lcd.print(\"Sensor \");\n  lcd.print(motionData.sensorId);\n  lcd.print(\" Count: \");\n  lcd.print(lastMotionCount);\n}\n\nvoid setup() {\n  Serial.begin(115200);\n  pinMode(alertLedPin, OUTPUT);\n  pinMode(buzzerPin, OUTPUT);\n  digitalWrite(alertLedPin, LOW);\n  \n  lcd.init();\n  lcd.backlight();\n  lcd.setCursor(0, 0);\n  lcd.print(\"ESP-NOW Monitor\");\n  lcd.setCursor(0, 1);\n  lcd.print(\"Ready\");\n  \n  WiFi.mode(WIFI_STA);\n  \n  if (esp_now_init() != ESP_OK) {\n    Serial.println(\"ESP-NOW init failed\");\n    return;\n  }\n  \n  esp_now_register_recv_cb(OnDataRecv);\n  \n  Serial.println(\"Receiver Ready\");\n  Serial.print(\"MAC Address: \");\n  Serial.println(WiFi.macAddress());\n}\n\nvoid loop() {\n  if (alertActive && (millis() - lastAlertTime > alertDuration)) {\n    digitalWrite(alertLedPin, LOW);\n    alertActive = false;\n    lcd.clear();\n    lcd.setCursor(0, 0);\n    lcd.print(\"System Ready\");\n    lcd.setCursor(0, 1);\n    lcd.print(\"Total alerts: \");\n    lcd.print(lastMotionCount);\n  }\n  \n  delay(100);\n}\n<\/code><\/pre>\n
    Multiple Sensors Network<\/h2>\n
    To add more sensors, modify the transmitter code with a unique sensor ID for each unit:<\/p>\n
    \/\/ For sensor #2 (different ID)\nmotionData.sensorId = 2;\n\n\/\/ For sensor #3\nmotionData.sensorId = 3;\n<\/code><\/pre>\n
    The receiver will display which sensor triggered.<\/p>\n
    Range Extension Tips<\/h2>\n
      \n
    • Use external antennas on ESP32 boards (some boards have IPEX connectors).<\/li>\n
    • Place units with line-of-sight when possible.<\/li>\n
    • Use 2.4GHz Wi-Fi channel 1 for better performance.<\/li>\n
    • Add external power (not USB) to ensure consistent transmission power.<\/li>\n<\/ul>\n
      Power-Saving Version (Deep Sleep)<\/h2>\n
      For battery-powered remote sensors, add deep sleep:<\/p>\n
      \/\/ Add to transmitter code\n#include <esp_sleep.h>\n\nvoid setup() {\n  \/\/ ... existing setup ...\n  esp_sleep_enable_ext0_wakeup((gpio_num_t)pirPin, 1);\n}\n\nvoid loop() {\n  \/\/ After sending, go to deep sleep\n  esp_deep_sleep_start();\n}\n<\/code><\/pre>\n
      With deep sleep, battery life can extend to months or even years.<\/p>\n
      Installation Steps<\/h2>\n
        \n
      1. Get MAC addresses:<\/strong> Upload MAC scanner to both boards, record receiver MAC.<\/li>\n
      2. Program transmitter:<\/strong> Update receiver MAC address and upload code.<\/li>\n
      3. Program receiver:<\/strong> Upload code and test.<\/li>\n
      4. Test communication:<\/strong> Place boards within range, trigger motion, verify receiver alerts.<\/li>\n
      5. Mount sensors:<\/strong> Place transmitter unit at desired monitoring location (mailbox, gate, shed).<\/li>\n
      6. Place receiver:<\/strong> Keep receiver unit where you can see\/hear alerts.<\/li>\n
      7. Power up:<\/strong> Use USB power or batteries.<\/li>\n<\/ol>\n
        Project Extensions<\/h2>\n
          \n
        • Wi-Fi gateway:<\/strong> Add Wi-Fi to receiver to forward alerts to phone via Telegram\/Blynk.<\/li>\n
        • Data logging:<\/strong> Add SD card module to receiver to log all events.<\/li>\n
        • Temperature sensor:<\/strong> Add DS18B20 to transmitter to send temperature data.<\/li>\n
        • Battery monitoring:<\/strong> Add voltage divider to transmitter to send battery level.<\/li>\n
        • Meshing:<\/strong> Add multiple receivers or repeaters for larger coverage area.<\/li>\n<\/ul>\n
          Troubleshooting<\/h2>\n
            \n
          • No communication:<\/strong> Check MAC address. Ensure boards are within range. Try swapping transmitter\/receiver roles.<\/li>\n
          • Intermittent connection:<\/strong> Reduce distance. Use external antennas.<\/li>\n
          • False alerts:<\/strong> Adjust PIR sensitivity. Ensure sensor not facing heat sources.<\/li>\n
          • Receiver not displaying:<\/strong> Check LCD wiring and I2C address.<\/li>\n<\/ul>\n
            Conclusion<\/h2>\n
            This ESP-NOW wireless notification system provides a low-power, long-range solution for monitoring remote locations without Wi-Fi. It’s ideal for property perimeter monitoring, mailbox alerts, and workshop security.<\/p>\n","protected":false},"excerpt":{"rendered":"
            Project Overview This project creates a wireless motion notification system that uses ESP-NOW protocol to send alerts between ESP32 boards without requiring a Wi-Fi network. It’s perfect for monitoring remote locations like workshops, sheds, or entry gates where Wi-Fi may not reach. Difficulty: Intermediate Estimated time: 2-3 hours Estimated cost: $20-30 (two ESP32 boards + […]<\/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-3920","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\nPIR Sensor Wireless Notification System with ESP-NOW - PIRHOME<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"http:\/\/www.pirhome.com\/?p=3920\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"PIR Sensor Wireless Notification System with ESP-NOW - PIRHOME\" \/>\r\n<meta property=\"og:description\" content=\"Project Overview This project creates a wireless motion notification system that uses ESP-NOW protocol to send alerts between ESP32 boards without requiring a Wi-Fi network. 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It’s perfect for monitoring remote locations like workshops, sheds, or entry gates where Wi-Fi may not reach. Difficulty: Intermediate Estimated time: 2-3 hours Estimated cost: $20-30 (two ESP32 boards + […]","og_url":"http:\/\/www.pirhome.com\/?p=3920","og_site_name":"PIRHOME","article_published_time":"2026-03-31T05:57:24+00:00","author":"nic@nicsky.com","twitter_card":"summary_large_image","twitter_misc":{"Written by":"nic@nicsky.com","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"http:\/\/www.pirhome.com\/?p=3920#article","isPartOf":{"@id":"http:\/\/www.pirhome.com\/?p=3920"},"author":{"name":"nic@nicsky.com","@id":"http:\/\/www.pirhome.com\/#\/schema\/person\/41049b5236f9c77c9314997d070db3e3"},"headline":"PIR Sensor Wireless Notification System with ESP-NOW","datePublished":"2026-03-31T05:57:24+00:00","mainEntityOfPage":{"@id":"http:\/\/www.pirhome.com\/?p=3920"},"wordCount":581,"commentCount":0,"publisher":{"@id":"http:\/\/www.pirhome.com\/#organization"},"articleSection":["Projects"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["http:\/\/www.pirhome.com\/?p=3920#respond"]}]},{"@type":"WebPage","@id":"http:\/\/www.pirhome.com\/?p=3920","url":"http:\/\/www.pirhome.com\/?p=3920","name":"PIR Sensor Wireless Notification System with ESP-NOW - PIRHOME","isPartOf":{"@id":"http:\/\/www.pirhome.com\/#website"},"datePublished":"2026-03-31T05:57:24+00:00","breadcrumb":{"@id":"http:\/\/www.pirhome.com\/?p=3920#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["http:\/\/www.pirhome.com\/?p=3920"]}]},{"@type":"BreadcrumbList","@id":"http:\/\/www.pirhome.com\/?p=3920#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"http:\/\/www.pirhome.com\/"},{"@type":"ListItem","position":2,"name":"PIR Sensor Wireless Notification System with ESP-NOW"}]},{"@type":"WebSite","@id":"http:\/\/www.pirhome.com\/#website","url":"http:\/\/www.pirhome.com\/","name":"PIRHOME","description":"PIR & Motion Sensor","publisher":{"@id":"http:\/\/www.pirhome.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"http:\/\/www.pirhome.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"http:\/\/www.pirhome.com\/#organization","name":"PIRHOME","url":"http:\/\/www.pirhome.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"http:\/\/www.pirhome.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.pirhome.com\/wp-content\/uploads\/2026\/02\/cropped-\u5fae\u4fe1\u56fe\u7247_2026-02-19_222409_472.jpg","contentUrl":"https:\/\/www.pirhome.com\/wp-content\/uploads\/2026\/02\/cropped-\u5fae\u4fe1\u56fe\u7247_2026-02-19_222409_472.jpg","width":512,"height":512,"caption":"PIRHOME"},"image":{"@id":"http:\/\/www.pirhome.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"http:\/\/www.pirhome.com\/#\/schema\/person\/41049b5236f9c77c9314997d070db3e3","name":"nic@nicsky.com","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/271d4eaab48e299e4fce771a8c43c537be3ac77a3115cc7de802a6c8b692d971?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/271d4eaab48e299e4fce771a8c43c537be3ac77a3115cc7de802a6c8b692d971?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/271d4eaab48e299e4fce771a8c43c537be3ac77a3115cc7de802a6c8b692d971?s=96&d=mm&r=g","caption":"nic@nicsky.com"},"sameAs":["http:\/\/www.pirhome.com"],"url":"https:\/\/www.pirhome.com\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/www.pirhome.com\/index.php?rest_route=\/wp\/v2\/posts\/3920","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pirhome.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pirhome.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pirhome.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pirhome.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3920"}],"version-history":[{"count":1,"href":"https:\/\/www.pirhome.com\/index.php?rest_route=\/wp\/v2\/posts\/3920\/revisions"}],"predecessor-version":[{"id":4037,"href":"https:\/\/www.pirhome.com\/index.php?rest_route=\/wp\/v2\/posts\/3920\/revisions\/4037"}],"wp:attachment":[{"href":"https:\/\/www.pirhome.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pirhome.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pirhome.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}