How to connect 5V sensor to battery powered device?
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On the battery powered sensor build page it is suggested to power 5V sensors using a step up converter. I guess that most 5V sensors use 5V logic levels for their digital output. Furthermore, as far as I understand the ATmega328P digital inputs do not accept voltages higher than Vcc + 0.5V (see datasheet p. 299). Consider as an example a sensebender operating at low battery level, say 2V. Wouldn’t the sensebender be harmed by a 5V digital signal from an attached sensor?
I hope someone in here can help explain how to properly connect a 5V sensor to battery powered device.
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On the battery powered sensor build page it is suggested to power 5V sensors using a step up converter. I guess that most 5V sensors use 5V logic levels for their digital output. Furthermore, as far as I understand the ATmega328P digital inputs do not accept voltages higher than Vcc + 0.5V (see datasheet p. 299). Consider as an example a sensebender operating at low battery level, say 2V. Wouldn’t the sensebender be harmed by a 5V digital signal from an attached sensor?
I hope someone in here can help explain how to properly connect a 5V sensor to battery powered device.
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