A small AC and large voltage (up to +/-90V) is created when the. It's cheap and easy to make without the need of much soldering. This basic piezo sensor is often used for flex, touch, vibration and shock measurements. I used an ultrasonic sensor with an Arduino for detecting the obstacles. In the bottom left of the image the green and yellow wires are coming from the piezo element. The image below shows the completed circuit using a solderable breadboard. ![]() Sound Sensor Tutorial for Arduino, ESP8266 and ESP32. The first step is to put your circuit together. If the buzzer is switched off, the vibration of the piezo and magnetic buzzer can lead to voltage spikes because: for the piezo buzzer, the piezo effect works both ways and the mechanical stress can create a voltage. The cane can automatically detect an obstacle and give the user a feedback response by vibrating the walking stick and giving a warning sound. stick to the simpler concept of the film sensor perceiving vibration. Using this Arduino smart cane, a visually impaired person can walk without anyone's help. I wanted it to be very cheap and easily replicable so even a child can easily make it from scratch in a couple of hours. It was that evening that I came up with the smart cane. I realized that I could use technology to assist people like him. This sensor measures 20mm in diameter and just 0.42mm thick. ![]() I was able to help him, and at that moment that I had an epiphany. A Piezo element comes in handy when you need to detect vibration or a knock. One day while I was out walking, I saw a blind person having a difficult time walking down a busy street. This Arduino smart cane can assist with walking alone in new environments by taking inputs through an obstacle sensor (ultrasonic sensor) and providing feedback to the person through haptics (a vibration motor). I wanted to make something to help the visually impaired, so I created an open-source Arduino project for a smart cane.
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