Hi,

since in general the Teensy inputs/outputs are not 5V tolerant, but most of the shield, sensors, actors e.g. for Arduino work with 5V signals, I'm curious what most of you are using (voltage level shifters, opto couplers?). Problem in may cases are space considerations for the final project or even timing issues if the level shifters are not fast enough. Would appreciate every comment on the topic.

Cheers,

Peter