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Popbumpers are configured as autofire_coils in MPF.
This is an example:
switches: s_popbumper_left: number: 7 coils: c_popbumper_left: number: 4 default_pulse_ms: 23 autofire_coils: ac_popbumper_left: coil: c_popbumper_left switch: s_popbumper_left
default_pulse_power in your coil
to control the strength and sound of your popbumpers.