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Published byLorraine Reeves Modified over 8 years ago
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The green light means it’s working!!!
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We wanted to make something… Practical – something you could actually sell Unique – won’t find this on google, and there’s definitely not a sparkfun kit for this
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Make your coffee with a wave of your hand from bed!
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Hardware and Software in a nutshell (or coffeebean) PIR motion sensor from Sparkfun -$9.95 -Pulls low when it detects motion -Open collector; requires pull up resistor on alarm wire We used the ATmega88, so that more features could be added if desired Used the real-time clock to control coffee maker’s safety timer feature Relay to handle 120V to coffeemaker Emitter-follower circuit to go from 40mA (max) on microcontroller to 80mA needed by relay.
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