The haptic module controls a high current driver to power a motor or buzzer (or similar devices).

In the MMR+ model, the coin vibration motor provides haptic feedback by vibrating using the haptic module.

Functions are defined in the haptic.h header filer. Circuit diagrams for the driver pin are in section 8 of the product specification.

#include "metawear/peripheral/haptic.h"

void run_haptic(MblMwMetaWearBoard* board) {
    // Run buzzer for 500ms
    mbl_mw_haptic_start_buzzer(board, 500);

    // Run motor at 50% strength for 1000ms
    mbl_mw_haptic_start_motor(board, 50.f, 1000);

The haptic module does not provide PWM (pulse-width modulation) capability.