satellite-dish command decoder


Posted on Jun 16, 2012

Decoding this bit stream into ASCII hex values is an ideal job for a low-cost 8-bit microcontroller. Using a microcontroller with onboard flash memory, such as the NEC Electronics µPD78F9418A (www.necelam.com), eliminates the need for external memory. The only external components are a few discrete devices for the signal detector and the coaxial-cable loop-through (Figure 2).



One of the µPD78F9418A microcontroller`s 10-bit A/D converters performs pulse detection and acts as a simple timing device. Using a reference voltage of 5V, the converter provides approximately 4.88 mV per step. An A/D-converter conversion value g




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