Manchester encoding between monitor and light sensor

I’ve been working on a way to push data into a microcontroller using a computer monitor (or smart phone) which flashes black and white. I’ve done some preliminary tests using one photoresistor read by an ATmega168 analog comparator circuit. The results have been mixed. Continue reading

AVR Analog Comparator

I haven’t put much time into the light-based programmer I was working on. But I did get some advice from Devlin Thyne who pushed me in a different direction on it. He suggested I use Manchester Encoding which only needs one input. It’s a method of rolling the clock signal and data into one. But before I do that, I’m going to switch over to using the AVR Analog Comparator hardware. It’s an easy way to get a 1 or 0 out of an analog input. See my simple example after the break.

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