I am directly driving a miniature pc mount speaker (the kind that looks like a piezo buzzer but its actually a speaker with a coil) from one of the AVR pins with a series resistor (100Ω) to limit the current.
The ATMEGA is running from batteries at 3V.
The speaker is only used as feedback for when a button is pressed. (~ 200uS 2k beep)
I know I should use a diode across the speaker to guard against reverse current, but given the small current and voltage used will it damage the ATMEGA if I don't use it?
Thanks in advance