Uno frequency
hi,
does uno frequency drop when use 3.3v rail instead of 5v , can compensated introducing increased delay in sketch? if uno 16 mhz @ 5v @ 3.3v have 10mhz should double clock critical delays??
best
does uno frequency drop when use 3.3v rail instead of 5v , can compensated introducing increased delay in sketch? if uno 16 mhz @ 5v @ 3.3v have 10mhz should double clock critical delays??
best
you have backwards. uno clock frequency not change voltage on supply rail; depends on crystal oscillator frequency using.
but...at lower voltages, cannot use higher frequencies (see figure 29-1 in atmega328p datasheet example). @ 4.5v , higher can run @ full 20 mhz, @ 2.7v can run @ 10 mhz. if try run atmega328p @ 16 mhz , 3.3v not work (or not work reliably). calculations maximum frequency @ 3.3v 13.3 mhz.
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the basic motor driver: simple, inexpensive motor driver 1 stepper motor or 2 dc motors
but...at lower voltages, cannot use higher frequencies (see figure 29-1 in atmega328p datasheet example). @ 4.5v , higher can run @ full 20 mhz, @ 2.7v can run @ 10 mhz. if try run atmega328p @ 16 mhz , 3.3v not work (or not work reliably). calculations maximum frequency @ 3.3v 13.3 mhz.
--
the basic motor driver: simple, inexpensive motor driver 1 stepper motor or 2 dc motors
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