To use the Nintendo GameBoy as a system control centre, you need an I2C interface in addition to the special plug-in card. The circuit presented here is cut out for the job. It has a total of 24 inputs and outputs, including 4 analogue inputs and 8 digital inputs. That's sufficient to control roller shutters, outside lighting, curtains, an alarm system, the central heating system and even more, possibly even remotely via TXT (SMS) messages.
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