Create a fun Halloween decoration that comes to life when trick-or-treaters approach. When the PIR sensor detects motion, the ghost lights up with eerie LEDs, plays spooky sounds, and can even move using a servo motor.<\/p>\n
Difficulty:<\/strong> Beginner A PIR sensor detects motion. When triggered, the system activates LEDs (in the ghost’s eyes or body), plays a spooky sound through a speaker, and optionally moves a servo to make the ghost shake or wave. After a few seconds, it returns to standby mode.<\/p>\n Use WS2812B addressable LEDs for spooky color effects:<\/p>\n Add a small fog machine or ultrasonic mist maker for an eerie effect when triggered.<\/p>\n Use two LEDs independently for a blinking effect:<\/p>\n This motion-activated ghost is a fun and engaging Halloween decoration that delights trick-or-treaters. With simple materials and basic electronics, you can create a memorable spooky experience.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview Create a fun Halloween decoration that comes to life when trick-or-treaters approach. When the PIR sensor detects motion, the ghost lights up with eerie LEDs, plays spooky sounds, and can even move using a servo motor. Difficulty: Beginner Estimated time: 2 hours Estimated cost: $20-30 How It Works A PIR sensor detects motion. […]<\/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-3911","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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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<\/td>\n 5V<\/td>\n<\/tr>\n PIR Sensor<\/th>\n GND<\/td>\n GND<\/td>\n<\/tr>\n PIR Sensor<\/th>\n OUT<\/td>\n Digital Pin 2<\/td>\n<\/tr>\n DFPlayer Mini<\/th>\n VCC<\/td>\n 5V<\/td>\n<\/tr>\n DFPlayer Mini<\/th>\n GND<\/td>\n GND<\/td>\n<\/tr>\n DFPlayer Mini<\/th>\n TX<\/td>\n Digital Pin 11<\/td>\n<\/tr>\n DFPlayer Mini<\/th>\n RX<\/td>\n Digital Pin 10 (via 1k\u03a9 resistor)<\/td>\n<\/tr>\n DFPlayer Mini<\/th>\n SPK+<\/td>\n Speaker (+) <\/td>\n<\/tr>\n DFPlayer Mini<\/th>\n SPK-<\/td>\n Speaker (-) <\/td>\n<\/tr>\n LEDs (parallel)<\/th>\n Anodes<\/td>\n Digital Pin 9 (through 220\u03a9)<\/td>\n<\/tr>\n LEDs<\/th>\n Cathodes<\/td>\n GND<\/td>\n<\/tr>\n Servo<\/th>\n VCC (red)<\/td>\n 5V<\/td>\n<\/tr>\n Servo<\/th>\n GND (brown)<\/td>\n GND<\/td>\n<\/tr>\n Servo<\/th>\n Signal (orange)<\/td>\n Digital Pin 3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Preparing Sound Files<\/h2>\n
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Arduino Code<\/h2>\n
\/\/ Halloween Motion-Activated Ghost\n\/\/ Lights up and plays sounds when motion detected\n\n#include <SoftwareSerial.h>\n#include <DFRobotDFPlayerMini.h>\n#include <Servo.h>\n\nSoftwareSerial mySoftwareSerial(10, 11); \/\/ RX, TX\nDFRobotDFPlayerMini myDFPlayer;\nServo ghostServo;\n\nconst int pirPin = 2;\nconst int ledPin = 9;\nconst int servoPin = 3;\n\nunsigned long lastTriggerTime = 0;\nconst unsigned long effectDuration = 5000; \/\/ 5 seconds of activity\nbool isActive = false;\n\n\/\/ Spooky sound files (track numbers)\nconst int ghostMoan = 1;\nconst int spookyLaugh = 2;\nconst int howlingWind = 3;\nconst int scream = 4;\n\nvoid setup() {\n Serial.begin(9600);\n \n pinMode(pirPin, INPUT);\n pinMode(ledPin, OUTPUT);\n \n digitalWrite(ledPin, LOW);\n \n ghostServo.attach(servoPin);\n ghostServo.write(90); \/\/ Center position\n \n \/\/ Initialize DFPlayer\n mySoftwareSerial.begin(9600);\n \n if (!myDFPlayer.begin(mySoftwareSerial)) {\n Serial.println(\"DFPlayer error - check wiring\");\n while (true);\n }\n \n myDFPlayer.volume(25); \/\/ 0-30\n Serial.println(\"DFPlayer ready\");\n \n Serial.println(\"Halloween Ghost Ready\");\n Serial.println(\"Waiting 60 seconds for PIR warm-up...\");\n delay(60000);\n}\n\nvoid activateGhost() {\n Serial.println(\"BOO! Ghost activated!\");\n \n isActive = true;\n lastTriggerTime = millis();\n \n \/\/ Turn on LEDs\n digitalWrite(ledPin, HIGH);\n \n \/\/ Randomly choose a sound\n int randomSound = random(1, 5); \/\/ 1-4\n myDFPlayer.play(randomSound);\n \n \/\/ Move servo for shaking effect (if attached)\n for (int i = 0; i < 3; i++) {\n ghostServo.write(60);\n delay(150);\n ghostServo.write(120);\n delay(150);\n }\n ghostServo.write(90); \/\/ Return to center\n \n \/\/ Alternate LED blinking for extra spookiness\n for (int i = 0; i < 3; i++) {\n digitalWrite(ledPin, LOW);\n delay(100);\n digitalWrite(ledPin, HIGH);\n delay(100);\n }\n}\n\nvoid deactivateGhost() {\n isActive = false;\n digitalWrite(ledPin, LOW);\n ghostServo.write(90);\n Serial.println(\"Ghost resting...\");\n}\n\nvoid loop() {\n bool motionDetected = digitalRead(pirPin) == HIGH;\n \n if (motionDetected && !isActive) {\n activateGhost();\n }\n \n if (isActive && (millis() - lastTriggerTime > effectDuration)) {\n deactivateGhost();\n }\n \n delay(50);\n}\n<\/code><\/pre>\nGhost Construction<\/h2>\n
Frame<\/h3>\n
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Costume<\/h3>\n
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Placement<\/h3>\n
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Optional Enhancements<\/h2>\n
Color-Changing LEDs<\/h3>\n
#include <FastLED.h>\n#define NUM_LEDS 8\nCRGB leds[NUM_LEDS];\n\n\/\/ In activation:\nfor (int i = 0; i < NUM_LEDS; i++) {\n leds[i] = CRGB(255, 0, 255); \/\/ Purple\n}\nFastLED.show();\n<\/code><\/pre>\nSmoke Effect<\/h3>\n
Blinking Eyes<\/h3>\n
digitalWrite(leftEyePin, HIGH);\ndelay(200);\ndigitalWrite(rightEyePin, HIGH);\ndelay(200);\ndigitalWrite(leftEyePin, LOW);\ndelay(200);\ndigitalWrite(rightEyePin, LOW);\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Safety Tips<\/h2>\n
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Project Extensions<\/h2>\n
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Conclusion<\/h2>\n