Since the exposure (both used in films as well as digital cameras) is dependent on brightness, any dark object that is moving in an exposure photograph will only be noticeable. However, anything bright (LEDs in this instance) is very obvious. In this case, Chris Hill wears an LED array on the tip of their fingers. When they take an image with a long exposure the hand appears dim and nearly invisibly. But the LEDsthat are lit in response to the presence of magnetic fields are bright and appear clearly in the image. This results in a bright image of magnetic fields that might otherwise be invisible to the naked eye.
Its LEDs (an Adafruit NeoPixel stick) as well as an ultrahigh sensitivity analog sensor (to determine the intensity of magnetic fields) are placed on the fingers however, the other electronic components are inside a 3D-printed enclosure which is attached onto the forearm. This enclosure is home to the Arduino Nano 33 BLE board as well as it’s an Adafruit MiniBoost 5V power module and a LiPo 2500mAh battery. The Arduino measures the strength of magnetic fields that are detected by the sensor. It then will activate a specific number of the LEDs that are in the NeoPixel Stick. The photo is light-colored it displays as a series of overlayed bar graphs, which illustrate the strength of magnetic fields in relation to their position.
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