Brady* the Ultrasonic Warning System for the Visually Impaired

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This portable ultrasonic detector is designed to assist visually impaired individuals in navigating their surroundings with minimal disruptions. The device is intended to be clipped onto a pocket, where it will emit a buzzing signal from a set distance away, alerting the user of potential obstacles. A compact design houses an Arduino Nano board, two 240 mAh batteries, a switch, a buzzer, and a charging unit. The enclosure allows for easy attachment to either a shirt or pant's pocket, with a small clip printed separately and glued to the top slot. Note that tight tolerances require precise calibration; I will release a high-tolerance version upon request. To create this detector, you'll need an Arduino Nano board, an HC-SR04 ultrasonic sensor, a 12mm 5V buzzer, a 120 ohm resistor, a switch, and a TP4056 1A Lipo Battery Charging Board. The wiring diagram is included in the accompanying pictures, along with the code (below), which can be modified to suit your needs. When soldering the wires, ensure all components are securely attached before measuring out the wire lengths, taking care to enclose any exposed wires with heat shrink tubing or an equivalent material. A good wiring job will result in cables that route through perfectly, and a set of M3 screws helps keep the two pieces securely in place. I've also included pictures of my brainstorming sessions and initial design concepts. #define trigPin 12 #define echoPin 11 //the led is to test the circuit, DOESN'T need to be in the final circuit #define led 8 #define buzzer 3 int sound = 1000; void setup() { Serial.begin (9600); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); pinMode(led, OUTPUT); pinMode(buzzer, OUTPUT); } void loop() { long duration, distance; digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance = (duration/2) / 29.1; //change the value of distance according to when you want the buzzer to buzz if (distance <= 50) { digitalWrite(led, HIGH); sound = 1000; digitalWrite(led, HIGH); } if (distance > 50 || distance <= 0){ Serial.println("Out of range"); noTone(buzzer); digitalWrite(led, LOW); } else { Serial.print(distance); Serial.println(" cm"); tone(buzzer, sound); } delay(500); } All 3D printed parts were designed in Fusion 360. Upon request, the Fusion files may be released. The name Brady comes from braille :D