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justDIY: LEDs As Sensors
Posted February 25, 2012 by Chris
“Each slave normally runs in a infinite loop, sampling the LED sensors as fast as it can and storing their values in a memory buffer. When a polling request is received from the master, an interrupt is generated which branches out of the sampling loop. I2C commands are pretty complex on paper, but merely a matter of setting and clearing bits in the digital world, so at 20mHz the pic handles them with lightning speed.”
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