Digital Tape Measure
I will show you how you can do a Digital Tape with arduino.
All you need is:
-Arduino (i use arduino rev 3 but you you can use another)
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1 lcd 16*2
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1 Ultrasonic sensor (HC-SR04)
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A lot of Jumper M/M
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1 Resistor Variable 10K ohm
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1 Computer
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1 cable usb - type B (to connect to arduino)