I’ve seen some projects that use ultrasonic sensors for those that are visually impaired, but I’m extra impressed by this one by Shahrul Nizam coming to us from Selangor, Malaysia. The main components are an ATmega 328, an HC-SR04 sensor, an LCD, and a buzzer. I was curious about using an LCD, but I believe it is simply quality control for the person creating the device. Although Sharul doesn’t show the device mounted on something, I imagine it might be attached to a glove, hat or even a purse.
If you are interested in working on a project with a good mission, you should check out his schematic and code. If you are new to rangefinders, you should check out our learning guide—Trinket Ultrasonic RangeFinder. It uses our powerful yet compact Trinket microcontroller with a sensor and LCD. So, like Sharul, you can see what is happening as you get close to walls. Creating with a purpose is always great work.
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