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An LED matrix (8x8, 0.7", MAX7219 chip) shows the approach of objects to an HC-SR04 ultrasonic sensor when the objects are closer than 10 cm. Everything is driven by an ATtiny85 microcontroller.
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LED matrix + HC-SR04 ultrasonic sensor + ATtiny85
An LED matrix (8x8, 0.7", MAX7219 chip) shows the approach of objects to an HC-SR04 ultrasonic sensor when the objects are closer than 10 cm. Everything is driven by an ATtiny85 microcontroller.
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