This project creates a hands-free garage door opener that detects when your car approaches and automatically opens the door. Using a PIR sensor mounted near the driveway, the system detects your vehicle’s heat signature and triggers a relay that simulates pressing the garage door opener button.<\/p>\n
Difficulty:<\/strong> Intermediate A PIR sensor placed at the driveway entrance detects the heat signature of your approaching car. When a vehicle is detected (after a short delay), the system activates a relay that connects across the garage door opener’s wall button terminals, simulating a button press. An optional reed switch on the garage door can detect whether the door is already open.<\/p>\n Most garage door openers have a wall button that simply shorts two wires together to trigger the door. You can connect a relay across these terminals to simulate a button press. The wires are low voltage (usually 12-24V DC), so it is safe to interface with.<\/p>\n Important:<\/strong> Identify the correct wires before connecting. Use a multimeter to find the pair that shows continuity when the wall button is pressed.<\/p>\n VCC<\/th>\n 3.3V or VIN<\/th>\n GND<\/th>\n GND<\/th>\n OUT<\/th>\n GPIO 4<\/th>\n IN<\/th>\n GPIO 5<\/th>\n One side<\/th>\n GPIO 12 (with 10k pull-up)<\/th>\n Other side<\/th>\n GND<\/th>\n<\/tbody>\n \u8868<\/p>\n This automatic garage door opener adds convenience and a modern touch to your home. With proper installation, it will reliably open your garage door as you arrive.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a hands-free garage door opener that detects when your car approaches and automatically opens the door. Using a PIR sensor mounted near the driveway, the system detects your vehicle’s heat signature and triggers a relay that simulates pressing the garage door opener button. Difficulty: Intermediate Estimated time: 2-3 hours Estimated […]<\/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-4126","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> $25-35<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Understanding Your Garage Door Opener<\/h2>\n
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 Relay Module<\/th>\n Reed Switch<\/th>\n Reed Switch<\/th>\n Arduino Code<\/h2>\n
\/\/ Automatic Garage Door Opener with PIR\n#include <WiFi.h>\n#include <WebServer.h>\n\nconst int pirPin = 4;\nconst int relayPin = 5;\nconst int doorSensorPin = 12;\n\nWebServer server(80);\n\nunsigned long lastTriggerTime = 0;\nconst unsigned long triggerDelay = 1000;\nconst unsigned long relayDuration = 500;\nconst unsigned long cooldownPeriod = 30000;\n\nbool motionDetected = false;\nbool doorOpen = false;\nunsigned long motionStartTime = 0;\n\nvoid setup() {\n Serial.begin(115200);\n \n pinMode(pirPin, INPUT);\n pinMode(relayPin, OUTPUT);\n pinMode(doorSensorPin, INPUT_PULLUP);\n \n digitalWrite(relayPin, LOW);\n \n WiFi.begin(\"YourSSID\", \"YourPassword\");\n while (WiFi.status() != WL_CONNECTED) delay(500);\n \n server.on(\"\/\", []() {\n String html = \"<html><body><h1>Garage Door<\/h1><p>Status: \";\n html += doorOpen ? \"OPEN\" : \"CLOSED\";\n html += \"<\/p><a href='\/open'><button>Open<\/button><\/a><\/body><\/html>\";\n server.send(200, \"text\/html\", html);\n });\n server.on(\"\/open\", []() {\n triggerDoor();\n server.sendHeader(\"Location\", \"\/\");\n server.send(303);\n });\n server.begin();\n \n doorOpen = digitalRead(doorSensorPin) == LOW;\n delay(60000);\n}\n\nvoid triggerDoor() {\n digitalWrite(relayPin, HIGH);\n delay(relayDuration);\n digitalWrite(relayPin, LOW);\n delay(2000);\n doorOpen = digitalRead(doorSensorPin) == LOW;\n lastTriggerTime = millis();\n}\n\nvoid loop() {\n server.handleClient();\n \n bool pirState = digitalRead(pirPin) == HIGH;\n \n if (pirState && !motionDetected) {\n motionDetected = true;\n motionStartTime = millis();\n }\n \n if (motionDetected && (millis() - motionStartTime > triggerDelay)) {\n if (!doorOpen && (millis() - lastTriggerTime > cooldownPeriod)) {\n triggerDoor();\n }\n motionDetected = false;\n }\n \n if (motionDetected && !pirState && (millis() - motionStartTime < triggerDelay)) {\n motionDetected = false;\n }\n \n bool newDoorState = digitalRead(doorSensorPin) == LOW;\n if (newDoorState != doorOpen) {\n doorOpen = newDoorState;\n }\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