An Automatic Tazer Drawer (inspired by Techjoyce)

Are you tired of your siblings taking whatever prized object you have, well look no further than a tazer controlled by an ultrasonic sensor strapped to a drawer¯\_(ツ)_/¯

Arduino uno

boost converter (tazer)

relay

esp32 (power)

here instead of a light or a lock being toggled a TAZER will be😈.

connect the red wire to your vin or 5v and your black wire to the COM on your relay. after that connect another black wire form the 5v or VIN to your NO on the relay.

const int TRIG_PIN = 7;

const int ECHO_PIN = 6;

const int RELAY_PIN = A5;

const float DISTANCE_THRESHOLD = 3.81; // cm (1.5 inches)

const float SOUND_SPEED = 0.017; // cm/us

const unsigned long DEBOUNCE_DELAY = 100; // milliseconds

float duration_us, distance_cm;

bool relayState = LOW;

unsigned long lastToggleTime = 0;

void setup() {

Serial.begin(9600);

pinMode(TRIG_PIN, OUTPUT);

pinMode(ECHO_PIN, INPUT);

pinMode(RELAY_PIN, OUTPUT);

}

void loop() {

// Trigger the sensor

digitalWrite(TRIG_PIN, HIGH);

delayMicroseconds(10);

digitalWrite(TRIG_PIN, LOW);

// Measure the pulse duration

duration_us = pulseIn(ECHO_PIN, HIGH);

// Handle case where pulseIn times out

if (duration_us > 0) {

distance_cm = SOUND_SPEED * duration_us;

// Check distance against threshold

if (distance_cm < DISTANCE_THRESHOLD) {

if (relayState == LOW) {

relayState = HIGH; // Activate relay

lastToggleTime = millis();

}

} else {

if (relayState == HIGH && (millis() - lastToggleTime >= DEBOUNCE_DELAY)) {

relayState = LOW; // Deactivate relay

}

}

} else {

Serial.println("Measurement timeout or error");

}

// Control the relay

digitalWrite(RELAY_PIN, relayState);

// Print the distance

Serial.print("Distance: ");

Serial.print(distance_cm > 0 ? distance_cm : 0); // Avoid negative distances

Serial.println(" cm");

delay(120); // Small delay for stability

}