This project creates a gesture-controlled light switch that turns lights on and off with a simple hand wave. Using a PIR sensor, the system detects motion and toggles a relay that controls the light. A short wave turns the light on, and another wave turns it off. It’s perfect for situations where your hands are dirty or full.<\/p>\n
Difficulty:<\/strong> Beginner A PIR sensor detects hand movement within a short range (10-30cm). Each time motion is detected, the Arduino toggles a relay that controls the light. The system includes a status LED to indicate the current state and a timeout to prevent rapid toggling (debounce).<\/p>\n Unlike traditional motion-sensing lights that turn on and then off automatically, this system maintains the state until another gesture is detected, giving you full control.<\/p>\n For gesture control, you want very short range (10-30cm):<\/p>\n This gesture-controlled light switch adds a touch of magic to any room. It’s perfect for kitchens (hands full of dishes), workshops (hands covered in paint), or simply for the novelty of waving to control lights.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a gesture-controlled light switch that turns lights on and off with a simple hand wave. Using a PIR sensor, the system detects motion and toggles a relay that controls the light. A short wave turns the light on, and another wave turns it off. It’s perfect for situations where your […]<\/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-3921","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 1-2 hours
\nEstimated cost:<\/strong> $15-25<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Circuit Diagram<\/h2>\n
Connection Table<\/h3>\n
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Component<\/th>\n Pin<\/th>\n Arduino Pin<\/th>\n<\/thead>\n \nPIR Sensor<\/th>\n VCC<\/th>\n 5V<\/th>\n<\/tr>\n PIR Sensor<\/th>\n GND<\/th>\n GND<\/th>\n<\/tr>\n PIR Sensor<\/th>\n OUT<\/th>\n Digital Pin 2<\/th>\n<\/tr>\n Relay Module<\/th>\n VCC<\/th>\n 5V<\/th>\n<\/tr>\n Relay Module<\/th>\n GND<\/th>\n GND<\/th>\n<\/tr>\n Relay Module<\/th>\n IN<\/th>\n Digital Pin 3<\/th>\n<\/tr>\n Status LED<\/th>\n Anode<\/th>\n Digital Pin 13 (through 220\u03a9)<\/th>\n<\/tr>\n Status LED<\/th>\n Cathode<\/th>\n GND<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n PIR Sensor Adjustment<\/h2>\n
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Arduino Code<\/h2>\n
\/\/ Gesture-Controlled Light Switch\n\/\/ Wave hand to toggle light on\/off\n\nconst int pirPin = 2;\nconst int relayPin = 3;\nconst int ledPin = 13;\n\nbool lightState = false;\nunsigned long lastTriggerTime = 0;\nconst unsigned long debounceDelay = 1000; \/\/ 1 second debounce\n\nvoid setup() {\n Serial.begin(9600);\n \n pinMode(pirPin, INPUT);\n pinMode(relayPin, OUTPUT);\n pinMode(ledPin, OUTPUT);\n \n digitalWrite(relayPin, LOW);\n digitalWrite(ledPin, LOW);\n \n Serial.println(\"Gesture Light Switch Ready\");\n Serial.println(\"Wave hand to toggle light\");\n delay(30000); \/\/ Short warm-up (30 seconds is enough for gesture use)\n}\n\nvoid toggleLight() {\n lightState = !lightState;\n digitalWrite(relayPin, lightState ? HIGH : LOW);\n digitalWrite(ledPin, lightState ? HIGH : LOW);\n \n Serial.print(\"Light \");\n Serial.println(lightState ? \"ON\" : \"OFF\");\n}\n\nvoid loop() {\n bool motion = digitalRead(pirPin) == HIGH;\n \n if (motion && (millis() - lastTriggerTime > debounceDelay)) {\n lastTriggerTime = millis();\n toggleLight();\n }\n \n delay(50);\n}\n<\/code><\/pre>\nEnhanced Version with LED Feedback<\/h2>\n
\/\/ Enhanced version with LED fade effect\nconst int pirPin = 2;\nconst int relayPin = 3;\nconst int ledPin = 13;\n\nbool lightState = false;\nunsigned long lastTriggerTime = 0;\nconst unsigned long debounceDelay = 1000;\nunsigned long fadeStartTime = 0;\nbool fading = false;\n\nvoid fadeLED(int start, int end) {\n int duration = 500; \/\/ 500ms fade\n unsigned long startTime = millis();\n while (millis() - startTime < duration) {\n int brightness = map(millis() - startTime, 0, duration, start, end);\n analogWrite(ledPin, brightness);\n delay(5);\n }\n analogWrite(ledPin, end);\n}\n\nvoid toggleLight() {\n lightState = !lightState;\n digitalWrite(relayPin, lightState ? HIGH : LOW);\n \n if (lightState) {\n fadeLED(0, 255);\n } else {\n fadeLED(255, 0);\n }\n \n Serial.print(\"Light \");\n Serial.println(lightState ? \"ON\" : \"OFF\");\n}\n\nvoid setup() {\n Serial.begin(9600);\n pinMode(pirPin, INPUT);\n pinMode(relayPin, OUTPUT);\n pinMode(ledPin, OUTPUT);\n digitalWrite(relayPin, LOW);\n digitalWrite(ledPin, LOW);\n delay(30000);\n}\n\nvoid loop() {\n bool motion = digitalRead(pirPin) == HIGH;\n if (motion && (millis() - lastTriggerTime > debounceDelay)) {\n lastTriggerTime = millis();\n toggleLight();\n }\n delay(50);\n}\n<\/code><\/pre>\nMounting Options<\/h2>\n
Drawer\/Cabinet Lighting<\/h3>\n
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Desk\/Workbench Lamp<\/h3>\n
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Installation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Troubleshooting<\/h2>\n
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debounceDelay<\/code>.<\/li>\nSafety Notes<\/h2>\n
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Conclusion<\/h2>\n