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Does anyone know will the Raspberry Pi 2 GPIO pins count a 1.8V input as logic one or logic zero?

Carlos Frank
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Probably neither. 1.8V is probably in the hysteresis region and could be seen as arbitrarily low (0) or high (1).

See http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/raspberry-pi/gpio-pin-electrical-specifications

joan
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