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You can buy a breakout board that allows you to connect up to 8 of these HC-SR04 sensors to an Arduino using the SPI protocol, so only one dedicated wire is used.http://superawesomerobots.com/product/octasonic-8-x-hc-sr04-breakout-for-arduino/
Blink a LED with Assembly Language & a PIC
How to make a TARDIS model
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