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Google Vision API. Same exercise as speech, but using pictures to control a robot.
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OCR using Google Vision API
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Twilio to enable control via voice or sms.
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OpenCV to recognize a colored object moving in a particular direction. The object can either be hand held or it can be an object like a gold fish.
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Flutter.io and/or web page via a REST API
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Myo control
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Train Amazon Alexa to understand movement commands
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Hand-held IMU.
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360 degree lidar to interpret hand angles and distances.
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Build a glove with these embedded and sense finger curls.