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 is perfect for monitoring remote locations like workshops, sheds, or entry gates where Wi-Fi may not reach.<\/p>\n
Difficulty:<\/strong> Intermediate Two ESP32 boards communicate via ESP-NOW, a low-power, connectionless protocol. The transmitter unit has a PIR sensor. When motion is detected, it sends a packet to the receiver unit. The receiver unit displays an alert via LED, buzzer, or LCD, and can also send notifications to a phone via Wi-Fi if available.<\/p>\n Upload this code to both ESP32 boards to get their MAC addresses:<\/p>\n Note the MAC address of the receiver board for the transmitter code.<\/p>\n This ESP-NOW wireless notification system provides a low-power, long-range solution for monitoring remote locations without Wi-Fi.<\/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 is 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 How It Works […]<\/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-4131","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 2-3 hours
\nEstimated cost:<\/strong> $20-30<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Get MAC Addresses<\/h2>\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>\nTransmitter 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\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;\n\nvoid OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {\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 esp_now_init();\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 esp_now_add_peer(&peerInfo);\n \n delay(60000);\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 }\n \n delay(100);\n}\n<\/code><\/pre>\nReceiver 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;\n\nbool alertActive = false;\nint lastMotionCount = 0;\n\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 lastMotionCount++;\n lastAlertTime = millis();\n alertActive = true;\n \n digitalWrite(alertLedPin, HIGH);\n tone(buzzerPin, 2000, 500);\n \n lcd.clear();\n lcd.setCursor(0, 0);\n lcd.print(\"Motion detected!\");\n lcd.setCursor(0, 1);\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.print(\"ESP-NOW Monitor\");\n lcd.setCursor(0, 1);\n lcd.print(\"Ready\");\n \n WiFi.mode(WIFI_STA);\n \n esp_now_init();\n esp_now_register_recv_cb(OnDataRecv);\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: \");\n lcd.print(lastMotionCount);\n }\n \n delay(100);\n}\n<\/code><\/pre>\nPower-Saving Deep Sleep Version<\/h2>\n
#include <esp_sleep.h>\n\nvoid setup() {\n esp_sleep_enable_ext0_wakeup((gpio_num_t)pirPin, 1);\n}\n\nvoid loop() {\n \/\/ Send notification then deep sleep\n esp_deep_sleep_start();\n}\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Conclusion<\/h2>\n