Arduino Due level shifter shield to make pins 5V tolerant

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as title suggests, make shield duo can switch level shifting on/off (preferably on pin pin or port port basis) most/all data pins. have sooo stuff 5v , mega/uno not big/fast enough projects want external level shifters pain prototype , never have enough.

this can quite complicated if want support secondary functions of pins, such i2c , analogue.

you can use txb0101 chip normal gpio functions, has severely restricted current capability.

i have done @ high current 8 of gpio on due style board, needs 1 chip plus control signal each io, not bad 8 lines not practical 54.

the other fet-style level converter chips might work better, i've not used them.

______
rob


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