Arduino Pro Mini commonly comes in two packages, 5V 16MHz and 3.3V 8MHz.
- The only difference between those two boards are regulator and clock crystal, right?
- What happens if I supply 2V to VCC pin of 5V 16MHz board?
- What happens if I supply 2V to RAW pin of 5V 16MHz board?
- What happens if I supply 5V to VCC pin of 3.3V 8MHz board?
- What happens if I supply 5V to RAW pin of 3.3V 8MHz board?
I read from some websites stating that Arduino Pro Mini power consumption can be reduced by removing regulator.
- Does removing regulator cause VCC pin = RAW pin?
Jean created a custom board for Arduino Pro Mini rated at 1MHz 1.8V.
- Which pin should I supply voltage after changing fuse setting? (Jean changed the fuse setting but I am not sure where to connect the supply voltage of 1.8V)
- Related to question 7, is there a need to remove regulator to supply 1.8V?
- Can I supply higher voltage (3V) on board with 1.8V fuse setting?
Reason for question/ Confusion
I want to power Arduino Pro Mini using 3V coin cell. Battery voltage decreases after usage to around 2V. I am thinking of simply inserting 3V coin cell to Arduino with 1.8V setting. But regulator may hinder the operation. That is why I am confused. Sites I visited states the possibility of using lower voltage after changing fuse setting but did not mention where to connect and whether regulator need to be removed.
Furthermore, ATmega328p datasheet states the VCC range is 1.8V to 5.5V. If that is so, why not just plug those voltage to VCC pin of Arduino Pro Mini instead of specifically 5V or 3.3V. Question 1-5 should clear my confusion on this.